ORCID Profile
0000-0002-9309-7993
Current Organisations
Queensland University of Technology
,
OAE Publishing Inc.
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Materials Engineering | Functional Materials | Materials engineering | Functional materials | Nanoscale Characterisation | Nanotechnology | Nanotechnology not elsewhere classified | Nanomanufacturing | Nanomaterials | Chemical Engineering not elsewhere classified | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Electronic and magnetic properties of condensed matter; superconductivity | Nanotechnology | Chemical Characterisation of Materials | Nanomaterials | Nanofabrication growth and self assembly | Environmental Engineering not elsewhere classified | Mineral Processing/Beneficiation | Other Electronic Engineering | Resources Engineering and Extractive Metallurgy | Materials Engineering Not Elsewhere Classified | Technology not elsewhere classified | Environmental Nanotechnology | Condensed Matter Characterisation Technique Development | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Management of Greenhouse Gas Emissions from Electricity Generation | Environmentally Sustainable Energy Activities not elsewhere classified | Expanding Knowledge in Engineering | Energy Conservation and Efficiency not elsewhere classified | Renewable Energy not elsewhere classified | Management of Greenhouse Gas Emissions from Energy Activities (excl. Electricity Generation) | Management of Gaseous Waste from Energy Activities (excl. Greenhouse Gases) | First Stage Treatment of Ores and Minerals not elsewhere classified | Physical sciences | Environmental and Natural Resource Evaluation not elsewhere classified | Electronic Information Storage and Retrieval Services | Integrated Circuits and Devices | Management of Greenhouse Gas Emissions from Manufacturing Activities | Energy Transformation not elsewhere classified | Expanding Knowledge in Technology | Solar-Thermal Electric Energy | Communication services not elsewhere classified | Air Quality not elsewhere classified | Scientific Instruments | Alumina Production | Communication equipment not elsewhere classified |
Related Links
Publications
Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design
Publisher: Elsevier BV
Date: 09-2018
Exploring the underlying mechanisms behind the increased far infrared radiation properties of perovskite-type Ce/Mn co-doped ceramics
Publisher: Elsevier BV
Date: 2019
Visible Light Photocatalyst: Iodine-Doped Mesoporous Titania with a Bicrystalline Framework
Publisher: American Chemical Society (ACS)
Date: 21-09-2006
DOI: 10.1021/JP062946M
Abstract: Iodine-doped (I-doped) mesoporous titania with a bicrystalline (anatase and rutile) framework was synthesized by a two-step template hydrothermal synthesis route. I-doped titania with anatase structure was also synthesized without the use of a block copolymer as a template. The resultant titania s les were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared, nitrogen adsorption, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-visible absorption spectroscopy. Both I-doped titania s les, with and without template, show much better photocatalytic activity than commercial P25 titania in the photodegradation of methylene blue under the irradiation of visible light (>420 nm) and UV-visible light. Furthermore, I-doped mesoporous titania with a bicrystalline framework exhibits better activity than I-doped titania with anatase structure. The effect of rutile phase in titania on the adsorptive capacity of water and surface hydroxyl, and photocatalytic activity was investigated in detail. The excellent performance of I-doped mesoporous titania under both visible light and UV-visible light can be attributed to the combined effects of bicrystalline framework, high crystallinity, large surface area, mesoporous structure, and high visible light absorption induced by I-doping.
A General Single-Source Route for the Preparation of Hollow Nanoporous Metal Oxide Structures
Publisher: Wiley
Date: 09-2009
Yolk–Shell Hybrid Materials with a Periodic Mesoporous Organosilica Shell: Ideal Nanoreactors for Selective Alcohol Oxidation
Publisher: Wiley
Date: 25-11-2011
Oxygen Vacancy Dependence of Magnetic Behavior in the LaAlO3/SrTiO3 Heterostructures
Publisher: Wiley
Date: 04-09-2016
Establishing the Golden Range of Seebeck Coefficient for Maximizing Thermoelectric Performance
Publisher: American Chemical Society (ACS)
Date: 15-01-2020
DOI: 10.1021/JACS.9B13272
Abstract: The coupling nature of thermoelectric properties determines that optimizing the Fermi level is the priority to achieve a net increase in thermoelectric performance. Conventionally, the carrier concentration is used as the reflection of the Fermi level in the band structure. However, carrier concentration strongly depends upon the material's effective mass, leading to that the optimal carrier concentration varies over a large scale for different materials. Herein, inspired by the big data survey, we develop a golden Seebeck coefficient range of 202-230 μV K
Synthesis and Electrochemical Property of Boron-Doped Mesoporous Carbon in Supercapacitor
Publisher: American Chemical Society (ACS)
Date: 25-10-2008
DOI: 10.1021/CM801729Y
Microstructural characterization of cobalt treated by laser surface melting under different powers
Publisher: Elsevier BV
Date: 02-2019
Achieving high thermoelectric properties in PEDOT:PSS/SWCNTs composite films by a combination of dimethyl sulfoxide doping and NaBH4 dedoping
Publisher: Elsevier BV
Date: 08-2022
Anisotropic Electrical Properties from Vapor–Solid–Solid Grown Bi2Se3 Nanoribbons and Nanowires
Publisher: American Chemical Society (ACS)
Date: 22-08-2014
DOI: 10.1021/JP505407J
High Porosity in Nanostructured n-Type Bi2Te3 Obtaining Ultralow Lattice Thermal Conductivity
Publisher: American Chemical Society (ACS)
Date: 09-08-2019
Abstract: Porous structure possesses full potentials to develop high-performance thermoelectric materials with low lattice thermal conductivity. In this study, the
One-step post-treatment boosts thermoelectric properties of PEDOT:PSS flexible thin films
Publisher: Elsevier BV
Date: 2023
Nanosized Anatase TiO2 Single Crystals with Tunable Exposed (001) Facets for Enhanced Energy Conversion Efficiency of Dye‐Sensitized Solar Cells
Publisher: Wiley
Date: 25-08-2011
Magnetic hollow spheres of periodic mesoporous organosilica and Fe3O4 nanocrystals: Fabrication and structure control
Publisher: Wiley
Date: 18-02-2008
A strategy-purifying wastewater with waste materials: Zn2+ modified waste red mud as recoverable adsorbents with an enhanced removal capacity of congo red
Publisher: Elsevier BV
Date: 09-2023
End-to-end relation extraction based on bootstrapped multi-level distant supervision
Publisher: Springer Science and Business Media LLC
Date: 24-04-2020
Characterizations of thermoelectric ceramics
Publisher: Elsevier
Date: 2023
Hierarchical Architectural Structures Induce High Performance in n‐Type GeTe‐Based Thermoelectrics
Publisher: Wiley
Date: 05-01-2023
Abstract: Compatible p‐ and n‐type materials are necessary for high‐performance GeTe thermoelectric modules, where the n‐type counterparts are in urgent need. Here, it is reported that the p‐type GeTe can be tuned into n‐type by decreasing the formation energy of Te vacancies via AgBiTe 2 alloying. AgBiTe 2 alloying induces Ag 2 Te precipitates and tunes the carrier concentration close to the optimal level, leading to a high‐power factor of 6.2 µW cm −1 K −2 at 423 K. Particularly, the observed hierarchical architectural structures, including phase boundaries, nano‐precipitates, and point defects, contribute an ultralow lattice thermal conductivity of 0.39 W m −1 K −1 at 423 K. Correspondingly, an increased ZT of 0.5 at 423 K is observed in n‐type (GeTe) 0.45 (AgBiTe 2 ) 0.55 . Furthermore, a single‐leg module demonstrates a maximum η of 6.6% at the temperature range from 300 to 500 K. This study indicates that AgBiTe 2 alloying can successfully turn GeTe into n‐type with simultaneously optimized thermoelectric performance.
Separable and recyclable meso-carbon@TiO2/carbon fiber composites for visible-light photocatalysis and photoelectrocatalysis
Publisher: Elsevier BV
Date: 09-2019
Synergistic modulation of power factor and thermal conductivity in Cu3SbSe4 towards high thermoelectric performance
Publisher: Elsevier BV
Date: 05-2020
An effective combination reaction involved with sputtered and selenized Sb precursors for efficient Sb2Se3 thin film solar cells
Publisher: Elsevier BV
Date: 08-2020
Enhanced hydrogen generation behaviors and hydrolysis thermodynamics of as-cast Mg–Ni–Ce magnesium-rich alloys in simulate seawater
Publisher: Elsevier BV
Date: 09-2019
In-doped Bi2Se3 hierarchical nanostructures as anode materials for Li-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA00045E
Dual Post-Treatments Boost Thermoelectric Performance of PEDOT:PSS Films and Their Devices
Publisher: Wiley
Date: 27-07-2022
Abstract: Owing to intrinsically high electrical conductivity and low thermoelectric conductivity, poly(3,4‐ethylenedioxithiophene):poly(styrenesulfonate) (PEDOT:PSS) shows promising thermoelectric properties. However, its relatively low power factor limits the practical applications of PEDOT:PSS. Here, unique dual post‐treatments by sodium sulfite (Na 2 SO 3 ) and formamide (CH 3 NO) to boost the thermoelectric performance of flexible PEDOT:PSS films with an optimized power factor of 74.09 µW m –1 K –2 are used. Comprehensive characterizations confirm that CH 3 NO reduces the excessive insulating PSS and thereby increases the electrical conductivity, while Na 2 SO 3 lowers the reduction of the doping level of PEDOT, leading to an increased Seebeck coefficient. Furthermore, the rationally post‐treated PEDOT:PSS films are assembled into a flexible thermoelectric device that exhibits an open‐circuit voltage of 2.8 mV using the heat from the human arm and an output power density of 2.56 µW cm –2 by a temperature difference of 25 K, indicating great potential for practical applications on sustainably charging low‐grade wearable electronics.
Rashba Effect Maximizes Thermoelectric Performance of GeTe Derivatives
Publisher: Elsevier BV
Date: 09-2020
Eco-Friendly Higher Manganese Silicide Thermoelectric Materials: Progress and Future Challenges
Publisher: Wiley
Date: 06-04-2018
Unravelling Effective-Medium transport and interfacial resistance in (CaTe) (GeTe)100- thermoelectrics
Publisher: Elsevier BV
Date: 2023
Wurtzite P-Doped GaN Triangular Microtubes as Field Emitters
Publisher: American Chemical Society (ACS)
Date: 07-05-2010
DOI: 10.1021/JP100689S
Strong Phonon–Phonon Interactions Securing Extraordinary Thermoelectric Ge1–xSbxTe with Zn-Alloying-Induced Band Alignment
Publisher: American Chemical Society (ACS)
Date: 28-12-2018
DOI: 10.1021/JACS.8B12624
Abstract: The ability of substitution atoms to decrease thermal conductivity is usually ascribed to the enhanced phonon-impurity scattering by assuming the original phonon dispersion relations. In this study, we find that 10% Sb
High Carrier Mobility and High Figure of Merit in the CuBiSe2 Alloyed GeTe
Publisher: Wiley
Date: 22-10-2021
Abstract: According to the Mott's relation, the figure‐of‐merit of a thermoelectric material depends on the charge carrier concentration and carrier mobility. This explains the observation that low thermoelectric properties of GeTe‐based materials suffer from the degraded carrier mobility, on account of the fluctuation of electronegativity and ionicity of various elements. Here, high‐performance CuBiSe 2 alloyed GeTe with high carrier mobility due to the small electronegativity difference between Cu and Ge atoms and the weak ionicity of CuTe and BiTe bonds, is developed. Density functional theory calculations indicate that CuBiSe 2 alloying increases the formation energy of Ge vacancies and correspondingly reduces the amount of Ge vacancies, leading to an optimized carrier concentration and a high power factor of ≈37.4 µW cm −1 K −2 at 723 K. Moreover, CuBiSe 2 alloying induces dense point defects and triggers ubiquitous lattice distortions, leading to a reduced lattice thermal conductivity of 0.39 W m −1 K −1 at 723 K. These synergistic effects result in an optimization of the carrier mobility, the carrier concentration, and the lattice thermal conductivity, which favors an enhanced peak figure‐of‐merit of ≈2.2 at 723 K in (GeTe) 0.94 (CuBiSe 2 ) 0.06 . This study provides guidance for the screening of GeTe‐based thermoelectric materials with high carrier mobility.
Amorphous SiOx nanowires catalyzed by metallic Ge for optoelectronic applications
Publisher: Elsevier BV
Date: 03-2011
Long wavelength emissions of periodic yard-glass shaped boron nitride nanotubes
Publisher: AIP Publishing
Date: 12-01-2009
DOI: 10.1063/1.3069278
Abstract: Extraordinary and stable long wavelength emission (centered at ∼685 nm) from the yard-glass shaped boron nitride nanotubes (YG-BNNTs) was observed in their cathodoluminescence and photoluminescence spectroscopy. The mechanism for this near-red light emission at ∼685 nm is attributed to the periodical nature of the BNNT units with regular lattice defects. The visible-light emission from YG-BNNTs indicates that this material has great potential for applications as nano-optical and/or nano-optoelectronic devices in nanoscale surgery and spectroscopy.
Advances in Versatile GeTe Thermoelectrics from Materials to Devices
Publisher: Wiley
Date: 28-11-2022
Abstract: Driven by the intensive efforts in the development of high‐performance GeTe thermoelectrics for mass‐market application in power generation and refrigeration, GeTe‐based materials display a high figure of merit of .0 and an energy conversion efficiency beyond 10%. However, a comprehensive review on GeTe, from fundamentals to devices, is still needed. In this regard, the latest progress on the state‐of‐the‐art GeTe is timely reviewed. The phase transition, intrinsic high carrier concentration, and multiple band edges of GeTe are fundamentally analyzed from the perspectives of the native atomic orbital, chemical bonding, and lattice defects. Then, the fabrication methods are summarized with a focus on large‐scale production. Afterward, the strategies for enhancing electronic transports of GeTe by energy filtering effect, resonance doping, band convergence, and Rashba band splitting, and the methods for strengthening phonon scatterings via nanoprecipitates, planar vacancies, and superlattices, are comprehensively reviewed. Besides, the device assembly and performance are highlighted. In the end, future research directions are concluded and proposed, which enlighten the development of broader thermoelectric materials.
Ultrahigh-performance tungsten-doped perovskites for the oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA02864H
Abstract: Based on the materials genome strategy, a novel B-site cation ordered double perovskite SrCo 0.4 Fe 0.2 W 0.4 O 3−δ has been designed as a highly efficient OER catalyst.
Solvothermal synthesis of high-purity porous Cu1.7Se approaching low lattice thermal conductivity
Publisher: Elsevier BV
Date: 11-2019
Atomic disorders in layer structured topological insulator SnBi2Te4 nanoplates
Publisher: Springer Science and Business Media LLC
Date: 17-08-2018
ZnS Branched Architectures as Optoelectronic Devices and Field Emitters
Publisher: Wiley
Date: 31-05-2010
Advances in Ag2S-based thermoelectrics for wearable electronics: Progress and perspective
Publisher: Elsevier BV
Date: 11-2023
Correction: Computer-aided design of high-efficiency GeTe-based thermoelectric devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE90029J
Abstract: Correction for ‘Computer-aided design of high-efficiency GeTe-based thermoelectric devices’ by Min Hong et al. , Energy Environ. Sci. , 2020, DOI: 10.1039/d0ee01004a.
Co-doped Sb2Te3paramagnetic nanoplates
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TC03767K
Abstract: Paramagnetic Co-doped Sb 2 Te 3 nanoplates are fabricated using a facile and green solvothermal method.
Synthesis, Purification and Opening of Short Cup-Stacked Carbon Nanotubes
Publisher: American Scientific Publishers
Date: 08-2009
DOI: 10.1166/JNN.2009.223
Abstract: A simple method is demonstrated to synthesize high-quality cup-stacked carbon nanotubes (CSCNTs) with short length. The as-synthesized CSCNTs are 0.2-3.2 microm in length, even shorter than the ball-milled long CSCNTs (approximately 7 microm). These CSCNTs have a diameter of 80-120 nm and a hollow channel of 60-100 nm along the nanotube axis. Moreover, a simple purification method is developed to remove iron particles and obtain short CSCNTs with two open ends. Such CSCNTs are very easily suspended in distilled water and tetrahydrofuran, which makes such material greatly promising as a candidate in many applications such as heterogeneous catalysis and photoelectrochemical cell.
Amorphous Iron Oxide Decorated 3D Heterostructured Electrode for Highly Efficient Oxygen Reduction
Publisher: American Chemical Society (ACS)
Date: 19-08-2011
DOI: 10.1021/CM201439D
Assembly-Free Fabrication of High-Performance Flexible Inorganic Thin-Film Thermoelectric Device Prepared by a Thermal Diffusion
Publisher: Wiley
Date: 14-09-2022
Abstract: High relative contact electrical resistance and poor flexibility in inorganic thin‐film thermoelectric devices significantly limit their practical applications. To overcome this challenge, a one‐step thermal diffusion method to fabricate assembly‐free inorganic thin‐film thermoelectric devices is developed, where the in situ grown electrode delivers an excellent leg‐electrode contact, leading to high output power and flexibility in the prepared p‐type Sb 2 Te 3 /n‐type Bi 2 Te 3 thin‐film device, which is composed of 8 pairs of p‐n junctions. Such a device shows a very low relative contact electrical resistance of 7.5% and a high power density of 1.42 mW cm –2 under a temperature difference of 60 K. Less than 10% change of the whole electrical resistance before and after bending test indicates the robust bending resistance and stability of the device. This study indicates that the novel assembly‐free one‐step thermal diffusion method can effectively enhance the leg‐electrode contact, the device thermoelectric performance, bending resistance, and stability, which can inspire the development of thin‐film thermoelectric devices.
Mechanically Driven Grain Boundary Formation in Nickel Nanowires
Publisher: American Chemical Society (ACS)
Date: 22-11-2017
Abstract: Metallic nanomaterials are widely used in micro/nanodevices. However, the mechanically driven microstructure evolution in these nanomaterials is not clearly understood, particularly when large stress and strain gradients are present. Here, we report the in situ bending experiment of Ni nanowires containing nanoscale twin lamellae using high-resolution transmission electron microscopy. We found that the large, localized bending deformation of Ni nanowires initially resulted in the formation of a low-angle tilt grain boundary (GB), consisting of randomly distributed dislocations in a diffuse GB layer. Further bending intensified the local plastic deformation and thus led to the severe distortion and collapse of local lattice domains in the GB region, thereby transforming a low-angle GB to a high-angle GB. Atomistic simulations, coupled with in situ atomic-scale imaging, unravelled the roles of bending-induced strain gradients and associated geometrically necessary dislocations in GB formation. These results offer a valuable understanding of the mechanically driven microstructure changes in metallic nanomaterials through GB formation. The work also has implications for refining the grains in bulk nanocrystalline materials.
A new type of carbon nitride-based polymer composite for enhanced photocatalytic hydrogen production
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CC00397G
Abstract: This communication reports on a new type of composite photocatalysts using a conducting polymer PEDOT as a hole transport pathway for promoting charge separation in photocatalytic hydrogen production.
BixSb2-xTe3 nanoplates with enhanced thermoelectric performance due to sufficiently decoupled electronic transport properties and strong wide-frequency phonon scatterings
Publisher: Elsevier BV
Date: 02-2016
Flexible Thermoelectric Materials and Generators: Challenges and Innovations
Publisher: Wiley
Date: 30-05-2019
Abstract: The urgent need for ecofriendly, stable, long-lifetime power sources is driving the booming market for miniaturized and integrated electronics, including wearable and medical implantable devices. Flexible thermoelectric materials and devices are receiving increasing attention, due to their capability to convert heat into electricity directly by conformably attaching them onto heat sources. Polymer-based flexible thermoelectric materials are particularly fascinating because of their intrinsic flexibility, affordability, and low toxicity. There are other promising alternatives including inorganic-based flexible thermoelectrics that have high energy-conversion efficiency, large power output, and stability at relatively high temperature. Herein, the state-of-the-art in the development of flexible thermoelectric materials and devices is summarized, including exploring the fundamentals behind the performance of flexible thermoelectric materials and devices by relating materials chemistry and physics to properties. By taking insights from carrier and phonon transport, the limitations of high-performance flexible thermoelectric materials and the underlying mechanisms associated with each optimization strategy are highlighted. Finally, the remaining challenges in flexible thermoelectric materials are discussed in conclusion, and suggestions and a framework to guide future development are provided, which may pave the way for a bright future for flexible thermoelectric devices in the energy market.
A Solvothermal Synthetic Environmental Design for High-Performance SnSe-Based Thermoelectric Materials
Publisher: Wiley
Date: 11-04-2022
Abstract: SnSe is challenging to use in thermoelectric devices due to difficulties in simultaneously optimizing its thermoelectric and mechanical properties. Here, the authors show a unique solvothermal synthetic environmental design to fabricate super‐large and micro/nanoporous Sn 0.965 Se microplates by using CrCl 3 . Cl − ions to trigger Sn‐vacancy formation and optimize the hole concentration to ≈3 × 10 19 cm −3 , while the as‐formed Cr(OH) 3 colloidal precipitations act as “templates” to achieve micro/nanoporous features, leading to low lattice thermal conductivity of ≈0.2 W m −1 K −1 in the as‐sintered polycrystal, contributing to a high ZT of ≈2.4 at 823 K and an average ZT of ≈1.1. Of particular note, the polycrystal exhibits high hardness (≈2.26 GPa) and compression strength (≈109 MPa), strengthened by grain refinement and vacancy‐induced lattice distortions and dislocations while a single‐leg device provides a stable output power ( mW) and conversion efficiency of ≈10% by a temperature difference of 425 K, indicating great potential for applying to practical thermoelectric devices.
On the synergistic effect of hydrohalic acids in the shape-controlled synthesis of anatase TiO2 single crystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2CE26744F
Polycrystalline SnSe with Extraordinary Thermoelectric Property via Nanoporous Design
Publisher: American Chemical Society (ACS)
Date: 15-10-2018
Abstract: Nanoporous materials possess low thermal conductivities derived from effective phonon scatterings at grain boundaries and interfaces. Thus nanoporous thermoelectric materials have full potential to improve their thermoelectric performance. Here we report a high ZT of 1.7 ± 0.2 at 823 K in p-type nanoporous polycrystalline SnSe fabricated via a facile solvothermal route. We successfully induce indium selenides (InSe
Correlation between the photocatalysis and growth mechanism of SnO2 nanocrystals
Publisher: IOP Publishing
Date: 10-02-2020
Simultaneously enhanced strength and plasticity of Ag2Se-based thermoelectric materials endowed by nano-twinned CuAgSe secondary phase
Publisher: Elsevier BV
Date: 11-2021
Point defect engineering and machinability in n-type Mg3Sb2-based materials
Publisher: Elsevier BV
Date: 12-2020
Enhancing thermoelectric performance of Bi2Te3-based nanostructures through rational structure design
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR00719H
Abstract: Nanostructuring has been successfully employed to enhance the thermoelectric performance of Bi2Te3 due to its obtained low thermal conductivity. In order to further reduce the thermal conductivity, we designed a hierarchical nanostructure assembled with well-aligned Bi2Te3 nanoplates using Te nanotubes as templates by a facile microwave-assisted solvothermal synthesis. From the comparisons of their thermoelectric performance and theoretical calculations with simple Bi2Te3 nanostructures, we found that Te/Bi2Te3 hierarchical nanostructures exhibit a higher figure-of-merit due to the optimized reduced Fermi level and enhanced phonon scattering, as well as the suppressed bipolar conduction. This study provides an effective approach to enhance the thermoelectric performance of Bi2Te3-based nanostructures by rationally designing the nanostructures.
Full-spectrum responsive photocatalytic activity via non-noble metal Bi decorated mulberry-like BiVO4
Publisher: Elsevier BV
Date: 08-2021
N-doped mesoporous carbon spheres as the oxygen reduction reaction catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 17-09-2014
DOI: 10.1039/C4TA04301D
Fabrication of crystal α-Si3N4/Si–SiOxcore–shell/Au–SiOxpeapod-like axial double heterostructures for optoelectronic applications
Publisher: IOP Publishing
Date: 11-07-2012
DOI: 10.1088/0957-4484/23/30/305603
Abstract: Novel crystal α-Si(3)N(4)/Si-SiO(x) core-shell/Au-SiO(x) peapod-like axial double heterostructural nanowires were obtained by directly annealing a Au covered SiO(2) thin film on a Si substrate. Our extensive electron microscopic investigation revealed that the α-Si(3)N(4) sections with a mathematical left angle bracket 101 mathematical right angle bracket growth direction were grown first, followed by growth of the Si-SiO(x) core-shell sections and finally growth of the Au-SiO(x) peapod-like sections. Through a series of systematically comparative experiments, a temperature-dependent multi-step vapor-liquid-solid growth mechanism is proposed. Room temperature photoluminescence measurement of in idual nanowires reveals two emission peaks (410 and 515 nm), indicating their potential applications in light sources, laser or light emitting display devices.
Synergistic effect approaching record-high figure of merit in the shear exfoliated n-type Bi2O2-2xTe2xSe
Publisher: Elsevier BV
Date: 03-2020
Conducting polymer-based flexible thermoelectric materials and devices: From mechanisms to applications
Publisher: Elsevier BV
Date: 08-2021
Super Large Sn1–xSe Single Crystals with Excellent Thermoelectric Performance
Publisher: American Chemical Society (ACS)
Date: 05-02-2019
Abstract: SnSe single crystals have drawn extensive attention for their ultralow thermal conductivity and outstanding thermoelectric performance. Here, we report super large Sn
Bacteria-Triggered pH-Responsive Osteopotentiating Coating on 3D-Printed Polyetheretherketone Scaffolds for Infective Bone Defect Repair
Publisher: American Chemical Society (ACS)
Date: 05-06-2020
Editorial preface - Thermoelectricity
Publisher: Elsevier BV
Date: 08-2022
Tuning wall thickness of TiO2 microtubes for an enhanced photocatalytic activity with thickness-dependent charge separation efficiency
Publisher: Elsevier BV
Date: 11-2020
Cracking behaviour and mechanism at grain boundary of gibbsite during calcination
Publisher: Elsevier BV
Date: 06-2020
Grain boundary re-crystallization and sub-nano regions leading to high plateau figure of merit for Bi2Te3 nanoflakes
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE02370B
Ti-Zr-O Nanotube Arrays with Controlled Morphology, Crystal Structure and Optical Properties
Publisher: American Scientific Publishers
Date: 11-2009
Abstract: A series of Ti-Zr-O nanotube arrays on Ti-Zr alloys with different ratios of Ti to Zr were prepared by a simple anodization process, and their morphologies, crystal structures and optical properties were investigated. It is found that the morphology, length, crystal structure and optical properties of Ti-Zr-O tubes can be well controlled by adjusting the ratio of Ti to Zr in Ti-Zr alloys. The tubes obtained evolved from circa (ca.) 100 nm to 50 nm in diameter, from ca. 2 to 10 microm in length with increasing Zr content in Ti-Zr alloys. As-prepared tubes grown on the alloys with a Zr content of <70 mol% are amorphous, while cubic phase of ZrO2 is predominately formed in the 90 mol% Zr-Ti alloy. The absorption edge of such tubes was found to span from 250 to 370 nm, and their emission band from 400 nm to 750 nm in photoluminescence spectra decays with the decrease of Zr content. In addition, upon calcination of varied Zr content Ti-Zr-O nanotubes, Zr doped anatase TiO2, zirconium titanate and Ti doped ZrO2 in were obtained.
Back matter
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM90181H
Carbon for the oxygen reduction reaction: a defect mechanism
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02229K
Abstract: A new defect mechanism for the ORR was proposed based on the theoretical calculations and our experimental results.
Fiber-based thermoelectrics for solid, portable, and wearable electronics
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03520C
Abstract: This review comprehensively summarizes the recent progress of fiber-based thermoelectric materials and devices for solid, portable, and wearable electronics.
High-performance SnSe thermoelectric materials: Progress and future challenge
Publisher: Elsevier BV
Date: 08-2018
Growth, Cathodoluminescence and Field Emission of ZnS Tetrapod Tree-like Heterostructures
Publisher: Wiley
Date: 06-10-2008
Trifold Tellurium One-Dimensional Nanostructures and Their Formation Mechanism
Publisher: American Chemical Society (ACS)
Date: 03-10-2013
DOI: 10.1021/CG4009569
N-doped silk wadding-derived carbon/SnOx@reduced graphene oxide film as an ultra-stable anode for sodium-ion half/full battery
Publisher: Elsevier BV
Date: 04-2022
Correlation between Multiple Growth Stages and Photocatalysis of SrTiO3 Nanocrystals
Publisher: American Chemical Society (ACS)
Date: 06-02-2015
DOI: 10.1021/JP512448P
Landau level splitting in Cd3As2 under high magnetic fields
Publisher: Springer Science and Business Media LLC
Date: 13-07-2015
DOI: 10.1038/NCOMMS8779
Abstract: Three-dimensional topological Dirac semimetals (TDSs) are a new kind of Dirac materials that exhibit linear energy dispersion in the bulk and can be viewed as three-dimensional graphene. It has been proposed that TDSs can be driven to other exotic phases like Weyl semimetals, topological insulators and topological superconductors by breaking certain symmetries. Here we report the first transport experiment on Landau level splitting in TDS Cd 3 As 2 single crystals under high magnetic fields, suggesting the removal of spin degeneracy by breaking time reversal symmetry. The detected Berry phase develops an evident angular dependence and possesses a crossover from non-trivial to trivial state under high magnetic fields, a strong hint for a fierce competition between the orbit-coupled field strength and the field-generated mass term. Our results unveil the important role of symmetry breaking in TDSs and further demonstrate a feasible path to generate a Weyl semimetal phase by breaking time reversal symmetry.
Vapour-solid growth of MoxW1-xTe2 nanobelts by a facile chemical vapour deposition method
Publisher: Elsevier BV
Date: 03-2019
Electron beam lithography of GeTe through polymorphic phase transformation
Publisher: Research Square Platform LLC
Date: 09-06-2023
DOI: 10.21203/RS.3.RS-3004049/V1
Abstract: Finding new phases can deeply understand the fundamental of materials and broaden their practical applications. Here, we report two undiscovered phases of GeTe including the zinc-blende (c-) phase and the hexagonal (h-) phase with interlayer van der Waals gaps. A polymorphic phase transformation from rhombohedral α-GeTe to c- and h-GeTe near room temperature, then supposedly to cubic β-GeTe at higher temperature, is first realized via electron beam irradiation. Theirunderlying thermodynamics and kinetics are illustrated by the in-situ heating experiments and molecular dynamics simulation. Density-functional theory calculation indicates that c-GeTe exhibits typical metallic behavior and h-GeTe is a narrow-gap semiconductor with a strong spin-orbital coupling effect. An atomic-scale electron beam lithography technique is finally developed and adopted to fabricate GeTe-based quantum devices compromising nanopillars and heterostructures of c- and h-GeTe in α-GeTe matrix.
Novel Boron Nitride Hollow Nanoribbons
Publisher: American Chemical Society (ACS)
Date: 02-10-2008
DOI: 10.1021/NN8004922
Abstract: Novel BN hollow nanoribbons (BNHNRs) were fabricated by a simple ZnS nanoribbon templating method. Such BNHNRs have a distinct structure and show unique optical properties, as demonstrated from Raman, Fourier transform infrared spectroscopy, UV-vis spectroscopy, and cathodoluminescence spectroscopy, when compared with other forms of BN nanostructures. With high crystallinity, the BNHNRs exhibit an extraordinary ultraviolet CL emission at 5.33 eV. Such a property is highly advantageous for optoelectronic applications, particularly in the ultraviolet region, such as blue lasing and light emitting diodes. This templating method has also been extended to synthesize other hollow nanostructures such as boron carbonitride. This study represents a new methodology for fabricating hollow nanostructures with defined crystallinity and unique optical properties.
Boosting the thermoelectric performance of n-type Bi2S3 by hierarchical structure manipulation and carrier density optimization
Publisher: Elsevier BV
Date: 09-2021
Performance optimization of a dual-thermoelectric-liquid hybrid system for central processing unit cooling
Publisher: Elsevier BV
Date: 08-2023
Long wavelength emissions of Se4+-doped In2O3hierarchical nanostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 08-07-2014
DOI: 10.1039/C4TC01025F
CO2 derived nanoporous carbons for carbon capture
Publisher: Elsevier BV
Date: 10-2020
Approaching high thermoelectric performance in p-type Cu3SbS4-based materials by rational electronic and nano/microstructural engineering
Publisher: Elsevier BV
Date: 08-2023
Thermal induced spin-polarized current protected by spin-momentum locking in ZrTe5 nanowires
Publisher: American Physical Society (APS)
Date: 26-07-2021
Rational band engineering and structural manipulations inducing high thermoelectric performance in n-type CoSb3 thin films
Publisher: Elsevier BV
Date: 03-2021
Wearable fiber-based thermoelectrics from materials to applications
Publisher: Elsevier BV
Date: 03-2021
Realizing high thermoelectric properties of SnTe via synergistic band engineering and structure engineering
Publisher: Elsevier BV
Date: 11-2019
Attaining ultrahigh thermoelectric performance of direction-solidified bulk n-type Bi2Te2.4Se0.6 via its liquid state treatment
Publisher: Elsevier BV
Date: 12-2017
Two-Dimensional Nanostructures for Energy-Related Applications
Publisher: CRC Press
Date: 27-03-2017
Coordination-controlled single-atom tungsten as a non-3d-metal oxygen reduction reaction electrocatalyst with ultrahigh mass activity
Publisher: Elsevier BV
Date: 06-2019
Synthesis of different magnetic carbon nanostructures by the pyrolysis of ferrocene at different sublimation temperatures
Publisher: Elsevier BV
Date: 11-2008
A low resistance and stable lithium-garnet electrolyte interface enabled by a multifunctional anode additive for solid-state lithium batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA07804F
Abstract: Limited reaction between Li 0.3 La 0.5 TiO 3 and molten lithium sufficiently modifies the properties of the lithium anode, improving the overall performance of solid-state lithium batteries.
High-quality Bi2Te3 thin films grown on mica substrates for potential optoelectronic applications
Publisher: AIP Publishing
Date: 15-07-2013
DOI: 10.1063/1.4813903
Abstract: We report high-quality topological insulator Bi2Te3 thin films grown on muscovite mica substrates by molecular beam epitaxy. The topographic and structural analysis revealed that the Bi2Te3 thin films exhibited atomically smooth terraces over a large area and a high crystalline quality. Both weak antilocalization effect and quantum oscillations were observed in the magnetotransport of the relatively thin s les. A phase coherence length of 277 nm for a 6 nm thin film and a high surface mobility of 0.58 m2 V−1 s−1 for a 4 nm thin film were achieved. These results confirm that the thin films grown on mica are of high quality.
Direct synthesis of carbon nanotubes decorated with size-controllable Fe nanoparticles encapsulated by graphitic layers
Publisher: Elsevier BV
Date: 09-2008
Realizing zT of 2.3 in Ge 1− x − y Sb x In y Te via Reducing the Phase-Transition Temperature and Introducing Resonant Energy Doping
Publisher: Wiley
Date: 19-01-2018
Abstract: GeTe with rhombohedral-to-cubic phase transition is a promising lead-free thermoelectric candidate. Herein, theoretical studies reveal that cubic GeTe has superior thermoelectric behavior, which is linked to (1) the two valence bands to enhance the electronic transport coefficients and (2) stronger enharmonic phonon-phonon interactions to ensure a lower intrinsic thermal conductivity. Experimentally, based on Ge
Thermally oxidized formation of new Ge dots over as-grown Ge dots in the Si capping layer
Publisher: AIP Publishing
Date: 12-2011
DOI: 10.1063/1.3665398
Abstract: A Si-capped Ge quantum dot s le was self-assembly grown via Stranski-Krastanov mode in a molecular beam epitaxy system with the Si capping layer deposited at 300 °C. After annealing the s le in an oxygen atmosphere at 1000 °C, a structure, namely two layers of quantum dots, was formed with the newly formed Ge-rich quantum dots embedded in the oxidized matrix with the position accurately located upon the as-grown quantum dots. It has been found that the formation of such nanostructures strongly depends upon the growth temperature and oxygen atmosphere. A growth mechanism was proposed to explain the formation of the nanostructure based on the Ge diffusion from the as-grown quantum dots, Ge segregation from the growing oxide, and subsequent migration/agglomeration.
Synthesis of rutile–anatase core–shell structured TiO2 for photocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B902666E
SWCNTs/Ag2Se film with superior bending resistance and enhanced thermoelectric performance via in situ compositing
Publisher: Elsevier BV
Date: 02-2023
Ce/Mn dual-doped LaAlO3 ceramics with enhanced far-infrared emission capability synthesized via a facile microwave sintering method
Publisher: Elsevier BV
Date: 02-2019
Catalytically enhanced hydrogen sorption in Mg-MgH<inf>2</inf> by coupling vanadium-based catalyst and carbon nanotubes
Publisher: MDPI AG
Date: 12-06-2015
DOI: 10.3390/MA8063491
Emerging alternative for artificial ammonia synthesis through catalytic nitrate reduction
Publisher: Elsevier BV
Date: 06-2021
Fabrication, Characterization, and Application of Boron Nitride Nanomaterials
Publisher: CRC Press
Date: 24-02-2015
DOI: 10.1201/B18073-8
Thermoelectric coolers: Infinite potentials for finite localized microchip cooling
Publisher: Elsevier BV
Date: 09-2022
Manipulating surface states in topological insulator nanoribbons
Publisher: Springer Science and Business Media LLC
Date: 13-02-2011
Abstract: Topological insulators display unique properties, such as the quantum spin Hall effect, because time-reversal symmetry allows charges and spins to propagate along the edge or surface of the topological insulator without scattering. However, the direct manipulation of these edge/surface states is difficult because they are significantly outnumbered by bulk carriers. Here, we report experimental evidence for the modulation of these surface states by using a gate voltage to control quantum oscillations in Bi(2)Te(3) nanoribbons. Surface conduction can be significantly enhanced by the gate voltage, with the mobility and Fermi velocity reaching values as high as ~5,800 cm(2) V(-1) s(-1) and ~3.7 × 10(5) m s(-1), respectively, with up to ~51% of the total conductance being due to the surface states. We also report the first observation of h/2e periodic oscillations, suggesting the presence of time-reversed paths with the same relative zero phase at the interference point. The high surface conduction and ability to manipulate the surface states demonstrated here could lead to new applications in nanoelectronics and spintronics.
Nanoscale pores plus precipitates rendering high-performance thermoelectric SnTe1-xSex with refined band structures
Publisher: Elsevier BV
Date: 06-2019
Mechanical alloying boosted SnTe thermoelectrics
Publisher: Elsevier BV
Date: 03-2021
Subtle Interplay between Localized Magnetic Moments and Itinerant Electrons in LaAlO3/SrTiO3 Heterostructures
Publisher: American Chemical Society (ACS)
Date: 19-05-2016
Abstract: Clarification of the role of magnetic ordering and scattering in two-dimensional electron gas has become increasingly important to understand the transport and magnetic behavior in the LaAlO3 (LAO)/SrTiO3 (STO) heterostructures. In this work, we report the sheet resistance of the LAO/STO heterostructures as functions of temperature, magnetic field, and field orientation. An unexpected resistance minimum was discovered at ∼10 K under a sufficiently high in-plane magnetic field. An anisotropic magnetoresistance (MR) is clearly identified, indicating the presence of magnetic scattering which may be related to the interaction between itinerant electrons and localized magnetic moments in the LaAlO3/SrTiO3 heterostructures. It is believed that the high concentration of oxygen vacancies induced by the ultralow oxygen partial pressure during the deposition process plays a predominant role in the occurrence of the anisotropic MR.
Fabrication of uniform anatase TiO2 particles exposed by {001} facets
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CC01473G
Abstract: Uniform anatase TiO(2) particles exposed by {001} facets were successfully synthesized by using EDTA together with F as morphology controlling agents. The crystallographic structure as well as the growth mechanism of anatase TiO(2) particles was investigated systematically by XRD, SEM, TEM and XPS, respectively.
Au impact on GaAs epitaxial growth on GaAs (111)B substrates in molecular beam epitaxy
Publisher: AIP Publishing
Date: 11-02-2013
DOI: 10.1063/1.4792053
Abstract: GaAs growth behaviour under the presence of Au nanoparticles on GaAs {111}B substrate is investigated using electron microscopy. It has been found that, during annealing, enhanced Ga surface diffusion towards Au nanoparticles leads to the GaAs epitaxial growth into {113}B faceted triangular pyramids under Au nanoparticles, governed by the thermodynamic growth, while during conventional GaAs growth, growth kinetics dominates, resulting in the flatted triangular pyramids at high temperature and the epitaxial nanowires growth at relatively low temperature. This study provides an insight of Au nanoparticle impact on GaAs growth, which is critical for understanding the formation mechanisms of semiconductor nanowires.
Influence of nitrogen on corrosion behaviour of high nitrogen martensitic stainless steels manufactured by pressurized metallurgy
Publisher: Elsevier BV
Date: 11-2018
Oligomeric Silica-Wrapped Perovskites Enable Synchronous Defect Passivation and Grain Stabilization for Efficient and Stable Perovskite Photovoltaics
Publisher: American Chemical Society (ACS)
Date: 07-05-2019
Enhanced mobility in LaAlO3/SrTiO3 heterostructures with layer-modulated patterning
Publisher: Elsevier BV
Date: 04-2019
Attaining reduced lattice thermal conductivity and enhanced electrical conductivity in as-sintered pure n-type Bi2Te3 alloy
Publisher: Springer Science and Business Media LLC
Date: 04-12-2018
Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA02677C
Abstract: Owing to the convergence of multivalence bands, the thermoelectric performance of polycrystalline SnSe was significantly enhanced.
Employing multi-functional SnSe inclusions to boost the thermoelectric performance of the shear-exfoliated Bi2Te2.7Se0.3
Publisher: Elsevier BV
Date: 08-2023
Enhanced thermoelectric properties of nanostructured n-type Bi2Te3 by suppressing Te vacancy through non-equilibrium fast reaction
Publisher: Elsevier BV
Date: 07-2020
Zinc sulfide nanowire arrays on silicon wafers for field emitters
Publisher: IOP Publishing
Date: 08-01-2010
DOI: 10.1088/0957-4484/21/6/065701
Abstract: Wurtzite structured zinc sulfide (ZnS) nanowire arrays are synthesized on silicon (111) wafers by a facile evaporation-condensation approach. These ZnS nanowire arrays possess predominant field emission properties with a low turn-on field of 2.9 V microm(-1), a low threshold field of 4.25 V microm(-1), a high field-enhancement factor (over 2700), and a high stability with a low fluctuation (approximately 0.8%). The improved field emission performance of these ZnS nanowire arrays is attributed to their specific crystallographic feature-array structures with nanotips and high single crystallinity. These results suggest that such ZnS nanowire arrays can be used as building blocks for field emitters.
A synergy of strain loading and laser radiation in determining the high-performing electrical transports in the single Cu-doped SnSe microbelt
Publisher: Elsevier BV
Date: 06-2020
Te-Doped Cu2Se nanoplates with a high average thermoelectric figure of merit
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02998A
Abstract: Te-doped Cu 2 Se nanostructures with a high average ZT value for Cu 2 Se 0.98 Te 0.02 .
Au-catalyzed and catalyst-free growth of one-dimensional Bi<inf>2</inf>Se<inf>3</inf> nanostructures
Publisher: IEEE
Date: 12-2014
Two-dimensional flexible thermoelectric devices: Using modeling to deliver optimal capability
Publisher: AIP Publishing
Date: 15-10-2021
DOI: 10.1063/5.0067930
Abstract: Two-dimensional flexible thermoelectric devices (2D FTEDs) are a promising candidate for powering wearable electronics by harvesting low-grade energy from human body and other ubiquitous energy sources. However, immature device designs in the parametric geometries of FTEDs cannot provide an optimized output power density because of either insufficient temperature difference or unnecessarily large internal resistance. Here, we theoretically design optimal parametric geometries of 2D FTEDs by systematically considering applied temperature difference, temperature-dependent thermoelectric properties of materials, leg thickness, and thermodynamic conditions. The obtained analytical solution determines the optimal leg length for 2D FTEDs when these parameters are given and, therefore, minimizes the internal device resistance and simultaneously maintains the high temperature difference across the TE legs to maximize the device output power density. According to this design, we use flexible Ag2Se films as thermoelectric legs to assemble a 2D FTED, which displays a maximum power output of 11.2 mW and a normalized output power density of 1.43 μW cm−2 K−1 at a temperature difference of 150 K, outnumbering other 2D FTEDs by threefolds. Our 2D FTED can power up four light-emitting diodes, which shows great potential for harvesting electricity from low-grade heat. The exotic and reliable device design concept of 2D FTEDs reported here can be extended to other thermoelectric systems to boost the practical applications of FTEDs.
Designing for high corrosion-resistant high nitrogen martensitic stainless steel based on DFT calculation and pressurized metallurgy method
Publisher: Elsevier BV
Date: 09-2019
A new cathode for solid oxide fuel cells capable of in situ electrochemical regeneration
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM12660A
Highly efficient H2 evolution over ZnO-ZnS-CdS heterostructures from an aqueous solution containing SO32- and S2- ions
Publisher: Springer Science and Business Media LLC
Date: 2010
Abstract: ZnO-ZnS-CdS heterostructure photocatalysts for water splitting were designed and prepared by a wet chemistry method. It was found that ZnO-ZnS-CdS heterostructures are highly active photocatalysts for H 2 evolution under simulated solar light irradiation in an aqueous solution containing SO 3 2- and S 2- ions as sacrificial reagents. H 2 evolution with (ZnO) 2 -(ZnS) 1 -(CdS) 1 heterostructure reaches up to 2790 μmol h −1 g −1 . The photoexcited electrons in the ZnO-ZnS-CdS heterostructures have a much longer lifetime ( ns) than that of the sole ZnO, ZnS, and CdS ( ns). The favorable interface processes of the heterostructures make a significant contribution to high photocatalytic H 2 evolution rate.
Tuning the Saturated Vapor Pressure of Solvothermal Synthesis to Boost the Thermoelectric Performance of Pristine Bi2Te3 Polycrystals by Anisotropy Strengthening
Publisher: American Chemical Society (ACS)
Date: 25-05-2023
High thermoelectric and mechanical performance in the n-type polycrystalline SnSe incorporated with multi-walled carbon nanotubes
Publisher: Elsevier BV
Date: 07-2022
Ce Filling Limit and Its Influence on Thermoelectric Performance of Fe3CoSb12-Based Skutterudite Grown by a Temperature Gradient Zone Melting Method
Publisher: MDPI AG
Date: 11-11-2021
DOI: 10.3390/MA14226810
Abstract: CoSb3-based skutterudite is a promising mid-temperature thermoelectric material. However, the high lattice thermal conductivity limits its further application. Filling is one of the most effective methods to reduce the lattice thermal conductivity. In this study, we investigate the Ce filling limit and its influence on thermoelectric properties of p-type Fe3CoSb12-based skutterudites grown by a temperature gradient zone melting (TGZM) method. Crystal structure and composition characterization suggests that a maximum filling fraction of Ce reaches 0.73 in a composition of Ce0.73Fe2.73Co1.18Sb12 prepared by the TGZM method. The Ce filling reduces the carrier concentration to 1.03 × 1020 cm−3 in the Ce1.25Fe3CoSb12, leading to an increased Seebeck coefficient. Density functional theory (DFT) calculation indicates that the Ce-filling introduces an impurity level near the Fermi level. Moreover, the rattling effect of the Ce fillers strengthens the short-wavelength phonon scattering and reduces the lattice thermal conductivity to 0.91 W m−1 K−1. These effects induce a maximum Seebeck coefficient of 168 μV K−1 and a lowest κ of 1.52 W m−1 K−1 at 693 K in the Ce1.25Fe3CoSb12, leading to a peak zT value of 0.65, which is 9 times higher than that of the unfilled Fe3CoSb12.
Atomic Insights into Phase Evolution in Ternary Transition‐Metal Dichalcogenides Nanostructures
Publisher: Wiley
Date: 05-2018
Abstract: Phase engineering through chemical modification can significantly alter the properties of transition-metal dichalcogenides, and allow the design of many novel electronic, photonic, and optoelectronics devices. The atomic-scale mechanism underlying such phase engineering is still intensively investigated but elusive. Here, advanced electron microscopy, combined with density functional theory calculations, is used to understand the phase evolution (hexagonal 2H→monoclinic T'→orthorhombic T
An array of Eiffel-tower-shape AlN nanotips and its field emission properties
Publisher: AIP Publishing
Date: 06-2005
DOI: 10.1063/1.1941462
Abstract: An array of Eiffel-tower-shape AlN nanotips has been synthesized and assembled vertically with Si substrate by a chemical vapor deposition method at 700 °C. The single-crystalline AlN nanotips along [001] direction, including sharp tips with 10–100 nm in diameter and submicron-sized bases, are distributed uniformly with density of 106–107tips∕cm2. Field emission (FE) measurements show that its turn on field is 4.7 V/μm, which is comparable to that of carbon nanotubes, and the fluctuation of FE current is as small as 0.74% for 4 h. It is revealed this nanostructure is available to optimize the FE properties and make the array a promising field emitter.
Deactivation and regeneration of oxygen reduction reactivity on double perovskite Ba2 Bi0.1 Sc0.2 Co1.7 O 6-x cathode for intermediate-temperature solid oxide fuel cells
Publisher: American Chemical Society (ACS)
Date: 28-02-2011
DOI: 10.1021/CM103534X
Advances and challenges in 2D MXenes: From structures to energy storage and conversions
Publisher: Elsevier BV
Date: 10-2021
Quasi-Vertically Oriented Sb2Se3 Thin-Film Solar Cells with Open-Circuit Voltage Exceeding 500 mV Prepared via Close-Space Sublimation and Selenization
Publisher: American Chemical Society (ACS)
Date: 27-09-2021
Enhanced Thermoelectric Properties of Ag-Modified Bi
Publisher: American Chemical Society (ACS)
Date: 11-10-2017
Abstract: A large-scale and facile electroless plating Ag method has been developed to fabricate high-performing Ag/Bi
Effects of Au catalyst on GaAs (111)<inf>B</inf> surface during annealing
Publisher: IEEE
Date: 12-2012
Planar Vacancies in Sn1–xBixTe Nanoribbons
Publisher: American Chemical Society (ACS)
Date: 28-04-2016
Abstract: Vacancy engineering is a crucial approach to manipulate physical properties of semiconductors. Here, we demonstrate that planar vacancies are formed in Sn1-xBixTe nanoribbons by using Bi dopants via a facile chemical vapor deposition. Through combination of sub-angstrom-resolution imaging and density functional theory calculations, these planar vacancies are found to be associated with Bi segregations, which significantly lower their formation energies. The planar vacancies exhibit polymorphic structures with local variations in the lattice relaxation level, determined by their proximity to the nanoribbon surface. Such polymorphic planar vacancies, in conjunction with Bi dopants, trigger distinct localized electronic states, offering platforms for device applications of ternary chalcogenide materials.
Enhancing thermoelectric performance of Cu-modified Bi0.5Sb1.5Te3 by electroless plating and annealing
Publisher: Elsevier BV
Date: 04-2018
Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells
Publisher: Springer Science and Business Media LLC
Date: 08-02-2021
Biomass-Derived Carbon for High-Performance Batteries: From Structure to Properties
Publisher: Wiley
Date: 08-04-2022
Abstract: Owing to the sustainability, environmental friendliness, and structural ersity of biomass‐derived materials, extensive efforts have been devoted to use them as energy storage materials in high‐energy rechargeable batteries. A timely and comprehensive review from the structures to mechanisms will significantly widen this research field. Here, it starts with the operation mechanism of batteries, and it aims to summarize the latest advances for biomass‐derived carbon to achieve high‐energy battery materials, including activation carbon methods and the structural classification of biomass‐derived carbon materials from zero dimension, one dimension, two dimension, and three dimension. Each strategy starts with carefully selected ex les and then moves to illustrate the underlying transport mechanism of electrons in the structure. In the end, challenges, strategies, and outlooks are pointed out for the future development of biomass‐derived carbon materials. Overall, this review will help researchers choose appropriate strategies to design biomass‐derived carbon materials, thereby promoting the application of biomass materials in battery design.
T-Shaped Bi2Te3–Te Heteronanojunctions: Epitaxial Growth, Structural Modeling, and Thermoelectric Properties
Publisher: American Chemical Society (ACS)
Date: 07-06-2013
DOI: 10.1021/JP4041666
New electroless plating method for preparation of highly active Co-B catalysts for NaBH4 hydrolysis
Publisher: Elsevier BV
Date: 2014
Realizing Bi-doped α-Cu2Se as a promising near-room-temperature thermoelectric material
Publisher: Elsevier BV
Date: 09-2019
Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening
Publisher: Elsevier BV
Date: 2018
High near-room temperature figure of merit of n-type Bi2GeTe4-based thermoelectric materials via a stepwise optimization of carrier concentration
Publisher: Elsevier BV
Date: 04-2022
Harvesting waste heat with flexible Bi2Te3 thermoelectric thin film
Publisher: Springer Science and Business Media LLC
Date: 17-11-2022
High-Performance GeTe-Based Thermoelectrics: from Materials to Devices
Publisher: Wiley
Date: 13-04-2020
Efficient and stable photocatalytic H2 evolution from water splitting by (Cd0.8Zn0.2)S nanorods
Publisher: Elsevier BV
Date: 06-2009
Granular Nanostructure: A Facile Biomimetic Strategy for the Design of Supertough Polymeric Materials with High Ductility and Strength
Publisher: Wiley
Date: 25-10-2017
Abstract: The realization of high strength, large ductility, and great toughness for polymeric materials is a vital factor for practical applications in industry. Unfortunately, until now this remains a huge challenge due to the common opposing trends that exist when promoting improvements in these properties using materials design strategies. In the natural world, the cuticle of mussel byssus exhibits a breaking strain as high as 100%, which is revealed to arise from an architectural granular microphase-separated structure within the protein matrix. Herein, a facile biomimetic designed granular nanostructured polymer film is reported. Such biomimetic nanostructured polymer films show a world-record toughness of 122 (± 6.1) J g
Thermoelectric GeTe with Diverse Degrees of Freedom Having Secured Superhigh Performance
Publisher: Wiley
Date: 13-02-2019
Abstract: Driven by the ability to harvest waste heat into reusable electricity and the exclusive role of serving as the power generator for deep spacecraft, intensive endeavors are dedicated to enhancing the thermoelectric performance of ecofriendly materials. Herein, the most recent progress in superhigh-performance GeTe-based thermoelectric materials is reviewed with a focus on the crystal structures, phase transitions, resonant bondings, multiple valance bands, and phonon dispersions. These features ersify the degrees of freedom to tune the transport properties of electrons and phonons for GeTe. On the basis of the optimized carrier concentration, strategies of alignment of multiple valence bands and density-of-state resonant distortion are employed to further enhance the thermoelectric performance of GeTe-based materials. To decrease the thermal conductivity, methods of strengthening intrinsic phonon-phonon interactions and introducing various lattice imperfections as scattering centers are highlighted. An overview of thermoelectric devices assembled from GeTe-based thermoelectric materials is then presented. In conclusion, possible future directions for developing GeTe in thermoelectric applications are proposed. The achieved high thermoelectric performance in GeTe-based thermoelectric materials with rationally established strategies can act as a reference for broader materials to tailor their thermoelectric performance.
Novel Thermal Diffusion Temperature Engineering Leading to High Thermoelectric Performance in Bi2Te3-Based Flexible Thin-Films
Publisher: Wiley
Date: 22-12-2022
Abstract: Flexible Bi 2 Te 3 ‐based thermoelectric devices can function as power generators for powering wearable electronics or chip‐sensors for internet‐of‐things. However, the unsatisfied performance of n‐type Bi 2 Te 3 flexible thin films significantly limits their wide application. In this study, a novel thermal diffusion method is employed to fabricate n‐type Te‐embedded Bi 2 Te 3 flexible thin films on flexible polyimide substrates, where Te embeddings can be achieved by tuning the thermal diffusion temperature and correspondingly result in an energy filtering effect at the Bi 2 Te 3 /Te interfaces. The energy filtering effect can lead to a high Seebeck coefficient ≈160 µV K −1 as well as high carrier mobility of ≈200 cm 2 V −1 s −1 at room‐temperature. Consequently, an ultrahigh room‐temperature power factor of 14.65 µW cm −1 K −2 can be observed in the Te‐embedded Bi 2 Te 3 flexible thin films prepared at the diffusion temperature of 623 K. A thermoelectric sensor is also assembled through integrating the n‐type Bi 2 Te 3 flexible thin films with p‐type Sb 2 Te 3 counterparts, which can fast reflect finger‐touch status and demonstrate the applicability of as‐prepared Te‐embedded Bi 2 Te 3 flexible thin films. This study indicates that the thermal diffusion method is an effective way to fabricate high‐performance and applicable flexible Te‐embedded Bi 2 Te 3 ‐based thin films.
Thermoelectric Coolers: Progress, Challenges, and Opportunities
Publisher: Wiley
Date: 05-01-2022
Abstract: Owing to the free of noise, mechanical component, working fluid, and chemical reaction, thermoelectric cooling is regarded as a suitable solution to address the greenhouse emission for the broad cooling scenarios. Here, the significant progress of state‐of‐the‐art thermoelectric coolers is comprehensively summarized and the related aspects of materials, fundamental design, heat sinks, and structures, are overviewed. Particularly, the usage of thermoelectric coolers in smart city, greenhouse, and personal and chip thermal management is highlighted. In the end, current challenges and future opportunities for further improvement of designs, performance, and applications of thermoelectric coolers are pointed out.
Se-alloying reducing lattice thermal conductivity of Ge0.95Bi0.05Te
Publisher: Elsevier BV
Date: 04-2022
No title found
Publisher: American Chemical Society (ACS)
Date: 10-10-2019
DOI: 10.1021/ACS.JPCLETT.9B02818
Abstract: We report a comprehensive
Eco-Friendly SnTe Thermoelectric Materials: Progress and Future Challenges
Publisher: Wiley
Date: 28-09-2017
Promising and Eco-Friendly Cu2X-Based Thermoelectric Materials: Progress and Applications
Publisher: Wiley
Date: 15-01-2020
Abstract: Due to the nature of their liquid-like behavior and high dimensionless figure of merit, Cu
Optimization of sodium hydroxide for securing high thermoelectric performance in polycrystalline Sn1-xSe via anisotropy and vacancy synergy
Publisher: Wiley
Date: 10-12-2020
DOI: 10.1002/INF2.12057
Enhanced carrier mobility and thermoelectric performance in Cu2FeSnSe4 diamond-like compound via manipulating the intrinsic lattice defects
Publisher: Elsevier BV
Date: 12-2018
Realizing a 10 °C Cooling Effect in a Flexible Thermoelectric Cooler Using a Vortex Generator
Publisher: Wiley
Date: 04-09-2022
Abstract: In this study, flexible thermoelectric coolers (FTECs) are used to develop an alternative personalized cooling technology to achieve a large temperature drop of 10 °C and cooling capacity of 256 W m –2 . Such an excellent cooling performance is attributed to the innovative design of the quadra‐layered Ag 2 Se oly(3,4‐ethylenedioxythiophene) polystyrene sulfonate structure in FTECs and the induced air vortices by the vortex generator attached to the hot surface of the device. The applied pulse‐width modulation technique guarantees human body comfort at inconsistent ambient temperature by modulating the duty ratio of the power source, which also saves 35% of the power consumption. As a result, the as‐prepared FTECs only consume 68.5 W so as to maintain a comfortable skin temperature (32 ± 0.5 °C) when the ambient temperature is at 31 °C. This technology provides a reliable and adjustable solution for personalized cooling in environments where comfortable temperatures are exceeded.
Optimized Thermoelectric Performance and Plasticity of Ductile Semiconductor Ag2S0.5Se0.5 Via Dual‐Phase Engineering
Publisher: Wiley
Date: 03-10-2023
Field emitters: ultrathin BN nanosheets protruded from BN fibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM02955F
High Performance Thermoelectric Materials: Progress and Their Applications
Publisher: Wiley
Date: 07-11-2018
Photocatalytic water oxidation on F, N co-doped TiO2 with dominant exposed {001} facets under visible light
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CC14453G
Abstract: Visible-light-responsive anatase TiO(2) platelets with dominant {001} facets were prepared via a facile nitridation reaction from a TiOF(2) precursor. The in situ co-doping of N and F in the anatase TiO(2) nanoparticles leads to drastically enhanced absorption and excellent water oxidation performance in the visible light region.
Noble metal-comparable SERS enhancement from semiconducting metal oxides by making oxygen vacancies
Publisher: Springer Science and Business Media LLC
Date: 17-07-2015
DOI: 10.1038/NCOMMS8800
Abstract: Surface-enhanced Raman spectroscopy (SERS) represents a very powerful tool for the identification of molecular species, but unfortunately it has been essentially restricted to noble metal supports (Au, Ag and Cu). While the application of semiconductor materials as SERS substrate would enormously widen the range of uses for this technique, the detection sensitivity has been much inferior and the achievable SERS enhancement was rather limited, thereby greatly limiting the practical applications. Here we report the employment of non-stoichiometric tungsten oxide nanostructure, sea urchin-like W 18 O 49 nanowire, as the substrate material, to magnify the substrate–analyte molecule interaction, leading to significant magnifications in Raman spectroscopic signature. The enrichment of surface oxygen vacancy could bring additional enhancements. The detection limit concentration was as low as 10 −7 M and the maximum enhancement factor was 3.4 × 10 5 , in the rank of the highest sensitivity, to our best knowledge, among semiconducting materials, even comparable to noble metals without ‘hot spots’.
Directional Thermal Diffusion Realizing Inorganic Sb2Te3/Te Hybrid Thin Films with High Thermoelectric Performance and Flexibility
Publisher: Wiley
Date: 31-08-2022
Abstract: Inorganic films possess much higher thermoelectric performance than their organic counterparts, but their poor flexibilities limit their practical applications. Here, Sb 2 Te 3 /Te x hybrid thin films with high thermoelectric performance and flexibility, fabricated via a novel directional thermal diffusion reaction growth method are reported. The directional thermal diffusion enables rationally tuning the Te content in Sb 2 Te 3 , which optimizes the carrier density and leads to a significantly enhanced power factor of 20 µW cm –1 K –2 , confirmed by both first‐principles calculations and experiments while dense boundaries between Te and Sb 2 Te 3 nanophases, contribute to the low thermal conductivity of ≈0.86 W m –1 K –1 , both induce a high ZT of ≈1 in (Sb 2 Te 3 )(Te) 1.5 at 453 K, ranking as the top value among the reported flexible films. Besides, thin films also exhibit extraordinary flexibility. A rationally designed flexible device composed of (Sb 2 Te 3 )(Te) 1.5 thin films as p ‐type legs and Bi 2 Te 3 thin films as n ‐type legs shows a high power density of 280 µW cm –2 at a temperature difference of 20 K, indicating a great potential for sustainably charging low‐power electronics.
Simultaneously Optimized Thermoelectric Performance of n-type Cu2Se alloyed Bi2Te3
Publisher: Elsevier BV
Date: 04-2021
Thermoelectric performance of p-type (Bi,Sb)2Te3 incorporating amorphous Sb2S3 nanospheres
Publisher: Elsevier BV
Date: 02-2022
Thermal stability and oxidation of layer-structured rhombohedral In3Se4 nanostructures
Publisher: AIP Publishing
Date: 23-12-2013
DOI: 10.1063/1.4857655
Abstract: The thermal stability and oxidation of layer-structured rhombohedral In3Se4 nanostructures have been investigated. In-situ synchrotron X-ray diffraction in a sealed system reveals that In3Se4 has good thermal stability up to 900 °C. In contrast, In3Se4 has lower thermal stability up to 550 or 200 °C when heated in an atmosphere flushed with Ar or in air, respectively. The degradation mechanism was determined to be the oxidation of In3Se4 by O2 in the heating environment. This research demonstrates how thermal processing conditions can influence the thermal stability of In3Se4, suggesting that appropriate heating environment for preserving its structural integrity is required.
A Novel Hydrogel Surface Grafted With Dual Functional Peptides for Sustaining Long-Term Self-Renewal of Human Induced Pluripotent Stem Cells and Manipulating Their Osteoblastic Maturation
Publisher: Wiley
Date: 17-01-2018
Enhancing Thermoelectric Properties of InTe Nanoprecipitate-Embedded Sn1–xInxTe Microcrystals through Anharmonicity and Strain Engineering
Publisher: American Chemical Society (ACS)
Date: 28-03-2019
Real-time observation of the thermally-induced phase transformation in GeTe and its thermal expansion properties
Publisher: Elsevier BV
Date: 02-2019
Rational structural design and manipulation advance SnSe thermoelectrics
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0MH00954G
Abstract: This review aims to comprehensively summarize the significant developments in nanostructural manipulations that benefit SnSe thermoelectrics.
Advances in Flexible Thermoelectric Materials and Devices Fabricated by Magnetron Sputtering
Publisher: Wiley
Date: 18-07-2023
Abstract: Due to the direct conversion between thermal and electrical energy, thermoelectric materials and their devices exhibit great potential for power generation and refrigeration. With the rapid development of personal wearable electronics, the design of flexible inorganic thermoelectric materials and devices receives increasing attention. As one of the most mature thin‐film fabrication techniques, magnetron sputtering plays a key role in the fabrication of inorganic thermoelectric thin films and devices, but its progress is still not timely and comprehensively reviewed. Herein, recent advances in magnetron sputtering‐fabricated thermoelectric materials and devices are studied, including their thermoelectric properties, mechanical properties, and device design routes. The differences in the properties of thermoelectric materials under different sputtering conditions, as well as their underlying mechanisms, are carefully discussed. In the end, it is pointed out the challenges and future directions for magnetron sputtering‐prepared inorganic thermoelectric thin‐film materials and devices for practical applications. This review can serve as a useful reference to guide the design of inorganic thermoelectric materials and devices prepared by magnetron‐sputtering‐based deposition techniques.
Advances in thermoelectric devices for localized cooling
Publisher: Elsevier BV
Date: 12-2022
Impurity Removal Leading to High-Performance CoSb3-Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction
Publisher: American Chemical Society (ACS)
Date: 04-11-2021
Taper-free and kinked germanium nanowires grown on silicon via purging and the two-temperature process
Publisher: IOP Publishing
Date: 28-02-2012
DOI: 10.1088/0957-4484/23/11/115603
Abstract: We investigate the growth procedures for achieving taper-free and kinked germanium nanowires epitaxially grown on silicon substrates by chemical vapor deposition. Singly and multiply kinked germanium nanowires consisting of segments were formed by employing a reactant gas purging process. Unlike non-epitaxial kinked nanowires, a two-temperature process is necessary to maintain the taper-free nature of segments in our kinked germanium nanowires on silicon. As an application, nanobridges formed between (111) side walls of V-grooved (100) silicon substrates have been demonstrated.
Hierarchical Structures Advance Thermoelectric Properties of Porous n-type β-Ag2Se
Publisher: American Chemical Society (ACS)
Date: 04-11-2020
Enhanced thermoelectric performance in MXene/SnTe nanocomposites synthesized via a facile one-step solvothermal method
Publisher: Elsevier BV
Date: 12-2021
Achieving high thermoelectric performance of Ni/Cu modified Bi0.5Sb1.5Te3 composites by a facile electroless plating
Publisher: Elsevier BV
Date: 09-2018
In Situ Assembly of Multi-Sheeted Buckybooks from Single-Walled Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 27-02-2009
DOI: 10.1021/NN800852N
Abstract: We report a simple approach for the direct and nondestructive assembly of multi-sheeted single-walled carbon nanotube book-like macrostructures (buckybooks) with good control of the nanotube diameter, the sheet packing density, and the book thickness during the floating catalytic growth process. The promise of such buckybooks is highlighted by demonstrating their high capacitance and high-efficiency molecular separation by directly using them as a binder-free electrode and as a filter, respectively. Our approach also provides a flexible and reliable way to easily assemble various other types of nanotubes into book-like or even more sophisticated sandwich-like hybrid macrostructures, realizing the shape-engineering of one-dimensional nanostructures to macroscopic well-defined architectures for various applications.
Computation-guided design of high-performance flexible thermoelectric modules for sunlight-to-electricity conversion
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE01895C
Abstract: A computation-guided design of a flexible thermoelectric module achieves a high output power density of 3 μW cm −2 by sunlight-to-electricity conversion.
Synergetic Regulation of Oriented Crystallization and Interfacial Passivation Enables 19.1% Efficient Wide‐Bandgap Perovskite Solar Cells
Publisher: Wiley
Date: 19-07-2022
Abstract: Wide‐bandgap (WBG) perovskite solar cells (PSCs) suffer from severe voltage loss, which significantly limits the enhancement of photovoltaic performance. Here, 4‐fluoro‐phenylethylammonium iodide (FPEAI) is used as a dual‐functional agent for oriented crystallization and comprehensive passivation of WBG PSCs. The additive of FPEAI promotes crystals to grow along with the (100) orientation with improved crystallinity and to spontaneously form Ruddlesden–Popper 2D perovskite on the grain boundary and surface of 3D crystals, which can passivate defects and protect the perovskite film from moisture erosion as well as suppressed ion migration. In addition, the 2D/3D heterostructure induces a matched energy‐level alignment, which mitigates the detrimental interfacial charge recombination at the interface of the 3D perovskite and hole transport layer. Consequently, the modified WBG PSCs exhibit an improved open‐circuit voltage to 1.3 V and a fill factor of 77.8%, leading to a remarkable power conversion efficiency of 19.1% with negligible hysteresis. Furthermore, the WBG PSCs maintain 85% of the original efficiency after 1000 h in air, demonstrating outstanding humidity stability. This work indicates that FPEAI can be used as a dual‐functional agent to significantly enhance the efficiency of WBG PSCs.
Wafer-scale arrayed p-n junctions based on few-layer epitaxial GaTe
Publisher: Springer Science and Business Media LLC
Date: 27-08-2015
Achieving High-Performance Ge0.92Bi0.08Te Thermoelectrics via LaB6-Alloying-Induced Band Engineering and Multi-Scale Structure Manipulation
Publisher: Wiley
Date: 02-12-2021
Abstract: In this work, a LaB 6 ‐alloying strategy is reported to effectively boost the figure‐of‐merit (ZT) of Ge 0.92 Bi 0.08 Te‐based alloys up to ≈2.2 at 723 K, attributed to a synergy of La‐dopant induced band structuring and structural manipulation. Density‐function‐theory calculations reveal that La dopant enlarges the bandgap and converges the energy offset between the sub‐valence bands in cubic‐structured GeTe, leading to a significantly increased effective mass, which gives rise to a high Seebeck coefficient of ≈263 µV K −1 and in turn a superior power factor of ≈43 µW cm −1 K −2 at 723 K. Besides, comprehensive electron microscopy characterizations reveal that the multi‐scale phonon scattering centers, including a high density of planar defects, Boron nanoparticles in tandem with enhanced boundaries, dispersive Ge nanoprecipitates in the matrix, and massive point defects, contribute to a low lattice thermal conductivity of ≈0.67 W m −1 K −1 at 723 K. Furthermore, a high microhardness of ≈194 H v is witnessed in the as‐designed Ge 0.92 Bi 0.08 Te(LaB 6 ) 0.04 alloy, derived from the multi‐defect‐induced strengthening. This work provides a strategy for developing high‐performance and mechanical robust middle‐temperature thermoelectric materials for practical thermoelectric applications.
High-performance thermoelectric Cu2Se nanoplates through nanostructure engineering
Publisher: Elsevier BV
Date: 09-2015
Aligned Titania Nanotubes as an Intercalation Anode Material for Hybrid Electrochemical Energy Storage
Publisher: Wiley
Date: 08-12-2008
Carbon-Encapsulated Copper Sulfide Leading to Enhanced Thermoelectric Properties.
Publisher: American Chemical Society (ACS)
Date: 03-06-2019
Abstract: Copper sulfide has been regarded as a promising thermoelectric material with relatively high thermoelectric performance and abundant resource. Large-scale synthesis and low-cost production of high-performance thermoelectric materials are keys to widespread application of thermoelectric technology. Here, Cu
Thermoelectric coolers as thermal management systems for medical applications: Design, optimization, and advancement
Publisher: Elsevier BV
Date: 12-2021
Condensed point defects enhance thermoelectric performance of rare-earth Lu-doped GeTe
Publisher: Elsevier BV
Date: 07-2023
Microworms self-assembled by boron nitride horns for optoelectronic applications
Publisher: Elsevier BV
Date: 12-2010
Defect-driven oxygen reduction reaction (ORR) of carbon without any element doping
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5QI00236B
Abstract: A “pure” porous carbon, lacking any elemental doping, exhibits excellent activity of oxygen reduction.
Graphene Oxide and Adiponectin-Functionalized Sulfonated Poly(etheretherketone) with Effective Osteogenicity and Remotely Repeatable Photodisinfection
Publisher: American Chemical Society (ACS)
Date: 10-02-2020
Sustainable utilization of municipal solid waste incineration fly ash for ceramic bricks with eco-friendly biosafety
Publisher: Elsevier BV
Date: 12-2018
Advances in bismuth-telluride-based thermoelectric devices: Progress and challenges
Publisher: Elsevier BV
Date: 06-2023
Self-assembled 3D flower-like hierarchical Ti-doped Cu3SbSe4 microspheres with ultralow thermal conductivity and high zT
Publisher: Elsevier BV
Date: 07-2018
Phase Control and Formation Mechanism of New-Phase Layer-Structured Rhombohedral In3Se4 Hierarchical Nanostructures
Publisher: American Chemical Society (ACS)
Date: 22-10-2021
DOI: 10.1021/CG401269P
Molybdenum‐Promoted Surface Reconstruction in Polymorphic Cobalt for Initiating Rapid Oxygen Evolution
Publisher: Wiley
Date: 03-12-2021
Abstract: It has been well recognized that the surface reconstruction of electrocatalysts at the initial stage in the form of phase transitions, defect migrations, valence regulations, etc., plays a critical role in generating real, surface active catalytic centers and achieving steady surface reactions. It is also expected that a low activation energy barrier for initiating surface reconstruction is crucial for rapid and stable electrochemical catalysis. Despite this, the surface reconstruction kinetics and their effects on catalytic reactions have been rarely investigated. Herein, using phase modulated polymorphic cobalt‐based catalysts with tailorable nitrogen‐metal bonds through a cationic molybdenum‐substitution strategy, real‐time X‐ray photoelectron spectroscopy (XPS) structural monitoring of the surface chemical state evolution during the catalytic reaction is performed to track the initial surface reconstruction kinetics during the alkaline oxygen evolution reaction (OER). It is concluded that the molybdenum‐modulated cobalt‐based nanocatalyst can be tuned with favorable initial surface reconstruction and stabilized active centers to reach optimized OER catalysis, accompanied by a low onset overpotential of only 210 mV and a favorable overpotential at 10 mA cm –2 of 290 mV, outperforming the commercial, noble‐metallic RuO 2 catalyst. This study thus provides new conceptual insights into rationally regulating the initial surface reconstruction kinetics for high‐performance electrocatalysis reactions.
Two-dimensional nanocoating-enabled orthopedic implants for bimodal therapeutic applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR02327B
Abstract: A multifunctional two-dimensional nanocoating consists of graphene oxide nanosheets, polydopamine nanofilm, and oligopeptide constructed on porous sulfonated polyetheretherketone for the purpose of bone infection treatment.
High-performance dual-gate carbon nanotube FETs with 40-nm gate length
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2005
The effect of rare earth element doping on thermoelectric properties of GeTe
Publisher: Elsevier BV
Date: 10-2022
Minimization of the electrical contact resistance in thin-film thermoelectric device
Publisher: AIP Publishing
Date: 10-04-2023
DOI: 10.1063/5.0141075
Abstract: High electrical contact resistance refrains the performance of thin-film thermoelectric devices at the demonstrative level. Here, an additional Ti contact layer is developed to minimize the electrical contact resistance to ∼4.8 Ω in an as-assembled thin-film device with 50 pairs of p–n junctions. A detailed interface characterization demonstrates that the low electrical contact resistance should be mainly attributed to the partial epitaxial growth of Bi2Te3-based thin-film materials. Correspondingly, the superlow electrical contact resistance facilitates the applicability of the out-of-plane thin-film device and results in an ultrahigh surface output power density of ∼81 μW cm−2 at a low temperature difference of 5 K. This study illustrates the Ti contact layer that strengthens the contact between Cu electrodes and Bi2Te3-based thermoelectric thin films mainly through partial epitaxial growth and contributes to high-performance thin-film thermoelectric devices.
A-site cation engineering enables oriented Ruddlesden-Popper perovskites towards efficient solar cells
Publisher: Springer Science and Business Media LLC
Date: 09-10-2022
Performance Optimization of a Thermoelectric‐Water Hybrid Cooling Garment
Publisher: Wiley
Date: 03-09-2023
Improved catalytic combustion of methane using CuO nanobelts with predominantly (001) surfaces
Publisher: Beilstein Institut
Date: 24-09-2018
DOI: 10.3762/BJNANO.9.235
Abstract: Through computational calculations, CuO(001) has been identified as an active surface for methane oxidation. Experimental validation with CuO nanobelts comprised of predominantly (001) surfaces has been performed and it is confirmed that the performance of such nanobelts is much higher than normal nanoparticles and nanowires. First principle calculations further clarified that two-coordinated oxygen plays a key role for methane adsorption and oxidation.
Roadmap on energy harvesting materials
Publisher: IOP Publishing
Date: 07-08-2023
Abstract: Ambient energy harvesting has great potential to contribute to sustainable development and address growing environmental challenges. Converting waste energy from energy-intensive processes and systems (e.g. combustion engines and furnaces) is crucial to reducing their environmental impact and achieving net-zero emissions. Compact energy harvesters will also be key to powering the exponentially growing smart devices ecosystem that is part of the Internet of Things, thus enabling futuristic applications that can improve our quality of life (e.g. smart homes, smart cities, smart manufacturing, and smart healthcare). To achieve these goals, innovative materials are needed to efficiently convert ambient energy into electricity through various physical mechanisms, such as the photovoltaic effect, thermoelectricity, piezoelectricity, triboelectricity, and radiofrequency wireless power transfer. By bringing together the perspectives of experts in various types of energy harvesting materials, this Roadmap provides extensive insights into recent advances and present challenges in the field. Additionally, the Roadmap analyses the key performance metrics of these technologies in relation to their ultimate energy conversion limits. Building on these insights, the Roadmap outlines promising directions for future research to fully harness the potential of energy harvesting materials for green energy anytime, anywhere.
Enhanced Thermoelectric Performance of Nanostructured Bi2Te3 through Significant Phonon Scattering
Publisher: American Chemical Society (ACS)
Date: 19-10-2015
Abstract: N-type Bi2Te3 nanostructures were synthesized using a solvothermal method and in turn sintered using sparking plasma sintering. The sintered n-type Bi2Te3 pellets reserved nanosized grains and showed an ultralow lattice thermal conductivity (∼0.2 W m(-1) K(-1)), which benefits from high-density small-angle grain boundaries accommodated by dislocations. Such a high phonon scattering leads an enhanced ZT of 0.88 at 400 K. This study provides an efficient method to enhance thermoelectric performance of thermoelectric nanomaterials through nanostructure engineering, making the as-prepared n-type nanostructured Bi2Te3 as a promising candidate for room-temperature thermoelectric power generation and Peltier cooling.
Fast Fabrication of High‐Performance CoSb3‐Based Thermoelectric Skutterudites via One‐Step Yb‐Promoted Peritectic Solidification
Publisher: Wiley
Date: 05-07-2023
Abstract: As a most promising mid‐temperature thermoelectric material, CoSb 3 ‐based bulk material exhibits an applicable figure‐of‐merit ( ZT ) of more than one. However, their fabrication is historically time‐consuming due to the long‐time solid‐state phase transitions from CoSb 2 to CoSb 3 . To overcome this challenge, here, a fast one‐step process is developed to fabricate n‐type Yb‐doped CoSb 3 with stable ZT of 1.12 at 765 K in h. Experiments confirm Yb promotes peritectic reactions of CoSb + Liquid → CoSb 2 and CoSb 2 + Liquid → CoSb 3 , optimizes power factor, and suppresses thermal conductivity. Moreover, the dense grains, induced by the one‐step crystallization, result in outstanding mechanical properties with a Young's modulus of 171.4 GPa and a hardness of 8.8 GPa in the Yb‐doped CoSb 3 . This study indicates that the fast one‐step fabrication route can effectively promote the practical applications of CoSb 3 ‐based thermoelectrics and provide guidance for thermoelectric fabrication via rational phase design.
High Thermoelectric Performance in p‐type Polycrystalline Cd‐doped SnSe Achieved by a Combination of Cation Vacancies and Localized Lattice Engineering
Publisher: Wiley
Date: 29-01-2019
Purification, preliminary characterization and in vitro immunomodulatory activity of tiger lily polysaccharide
Publisher: Elsevier BV
Date: 06-2014
DOI: 10.1016/J.CARBPOL.2014.02.004
Abstract: A water-soluble polysaccharide (LLPS) from tiger lily was extracted by ultrasonic wave-assisted extraction. The LLPS, which was isolated by alcohol precipitation, was further purified by DEAE Sepharose Fast Flow and Sephadex G-100 chromatography, which resulted in LLPS fractions in LLPS-1, LLPS-2 and LLPS-3, with molecular weights of 350.5, 403.3 and 146.2kDa, respectively. LLPS-1 and LLPS-2 primarily consisted of glucose and mannose in a molar ratio of nearly 1:2 and 1:1, respectively. In contrast, LLPS-3 was primarily composed of arabinose, galactose, glucose and mannose in a molar ratio of nearly 2:2:2:1. LLPS fractions could stimulate the proliferation of macrophages. The in vitro immunomodulatory activity of the fractions was evaluated. The results showed that treatment with 25-400 μg/mL of LLPS fractions could increase phagocytic activity and nitric oxide production of macrophages in a dose-dependent manner.
Ellagic acid–Fe nanoscale coordination polymer with higher longitudinal relaxivity for dual-modality T1-weighted magnetic resonance and photoacoustic tumor imaging
Publisher: Elsevier BV
Date: 08-2020
Indium Selenides: Structural Characteristics, Synthesis and Their Thermoelectric Performances
Publisher: Wiley
Date: 14-04-2014
Abstract: Indium selenides have attracted extensive attention in high-efficiency thermoelectrics for waste heat energy conversion due to their extraordinary and tunable electrical and thermal properties. This Review aims to provide a thorough summary of the structural characteristics (e.g. crystal structures, phase transformations, and structural vacancies) and synthetic methods (e.g. bulk materials, thin films, and nanostructures) of various indium selenides, and then summarize the recent progress on exploring indium selenides as high-efficiency thermoelectric materials. By highlighting challenges and opportunities in the end, this Review intends to shine some light on the possible approaches for thermoelectric performance enhancement of indium selenides, which should open up an opportunity for applying indium selenides in the next-generation thermoelectric devices.
A nanohybrid of CdTe@CdS nanocrystals and titania nanosheets with p–n nanojunctions for improved visible light-driven hydrogen production
Publisher: Elsevier BV
Date: 04-2016
Nano-scale dislocations induced by self-vacancy engineering yielding extraordinary n-type thermoelectric Pb0.96-yInySe
Publisher: Elsevier BV
Date: 08-2018
Ni doping and rational annealing boost thermoelectric performance of nanostructured double perovskite Pr1.8Sr0.2CoFeO6
Publisher: Elsevier BV
Date: 12-2022
Taper-Free and Vertically Oriented Ge Nanowires on Ge/Si Substrates Grown by a Two-Temperature Process
Publisher: American Chemical Society (ACS)
Date: 02-12-2011
DOI: 10.1021/CG2008914
Self-hygroscopic and smart color-changing hydrogels as coolers for improving energy conversion efficiency of electronics
Publisher: Elsevier BV
Date: 04-2023
Vertically oriented epitaxial germanium nanowires on silicon substrates using thin germanium buffer layers
Publisher: IOP Publishing
Date: 29-06-2010
DOI: 10.1088/0957-4484/21/29/295602
Abstract: We demonstrate a method to realize vertically oriented Ge nanowires on Si(111) substrates. Ge nanowires were grown by chemical vapor deposition using Au nanoparticles to seed nanowire growth via a vapor-liquid-solid growth mechanism. Rapid oxidation of Si during Au nanoparticle application inhibits the growth of vertically oriented Ge nanowires directly on Si. The present method employs thin Ge buffer layers grown at low temperature less than 600 degrees C to circumvent the oxidation problem. By using a thin Ge buffer layer with root-mean-square roughness of approximately 2 nm, the yield of vertically oriented Ge nanowires is as high as 96.3%. This yield is comparable to that of homoepitaxial Ge nanowires. Furthermore, branched Ge nanowires could be successfully grown on these vertically oriented Ge nanowires by a secondary seeding technique. Since the buffer layers are grown under moderate conditions without any high temperature processing steps, this method has a wide process window highly suitable for Si-based microelectronics.
Silicon-induced oriented ZnS nanobelts for hydrogen sensitivity
Publisher: IOP Publishing
Date: 14-01-2008
DOI: 10.1088/0957-4484/19/05/055710
Abstract: Oriented ZnS nanobelts were grown on an Si substrate using hydrogen-assisted thermal evaporation under moist gas conditions. It was found that these ZnS nanobelts had a single crystal hexagonal wurtzite structure growing along the [0001] direction. They had a rectangular cross section with lengths of up to tens of micrometres, a typical width of 50-150 nm, and a thickness of ∼40 nm. A silicon-induced vapour-liquid-solid process was proposed for the formation of the ZnS nanobelts and their assembly. These oriented nanobelts have much faster response time to hydrogen gas than that of pure ZnO and Pd-sensitized ZnO, showing excellent hydrogen sensing properties.
Fabrication of graphene/polyaniline composite paper via in situ anodic electropolymerization for high-performance flexible electrode
Publisher: American Chemical Society (ACS)
Date: 02-06-2009
DOI: 10.1021/NN900297M
Abstract: Freestanding and flexible graphene olyaniline composite paper was prepared by an in situ anodic electropolymerization of polyaniline film on graphene paper. This graphene-based composite paper electrode, consisting of graphene olyaniline composite sheets as building blocks, shows a favorable tensile strength of 12.6 MPa and a stable large electrochemical capacitance (233 F g(-1) and 135 F cm(-3) for gravimetric and volumetric capacitances), which outperforms many other currently available carbon-based flexible electrodes and is hence particularly promising for flexible supercapacitors.
Highly (00l)-oriented Bi2Te3/Te heterostructure thin films with enhanced power factor
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR07112H
Abstract: A high power factor was obtained in highly (00 l )-oriented Bi 2 Te 3 /Te heterostructure thin films via energy-dependent carrier filtering effect.
Scalable Growth of High Mobility Dirac Semimetal Cd3As2 Microbelts
Publisher: American Chemical Society (ACS)
Date: 27-08-2015
DOI: 10.1021/ACS.NANOLETT.5B01885
Abstract: Three-dimensional (3D) Dirac semimetals are 3D analogues of graphene, which display Dirac points with linear dispersion in k-space, stabilized by crystal symmetry. Cd3As2 has been predicted to be 3D Dirac semimetals and was subsequently demonstrated by angle-resolved photoemission spectroscopy. As unveiled by transport measurements, several exotic phases, such as Weyl semimetals, topological insulators, and topological superconductors, can be deduced by breaking time reversal or inversion symmetry. Here, we reported a facile and scalable chemical vapor deposition method to fabricate high-quality Dirac semimetal Cd3As2 microbelts they have shown ultrahigh mobility up to 1.15 × 10(5) cm(2) V(-1) s(-1) and pronounced Shubnikov-de Haas oscillations. Such extraordinary features are attributed to the suppression of electron backscattering. This research opens a new avenue for the scalable fabrication of Cd3As2 materials toward exciting electronic applications of 3D Dirac semimetals.
Gate-Controlled Surface Conduction in Na-Doped Bi2Te3 Topological Insulator Nanoplates
Publisher: American Chemical Society (ACS)
Date: 09-02-2012
DOI: 10.1021/NL202920P
Abstract: Exploring exciting and exotic physics, scientists are pursuing practical device applications for topological insulators. The Dirac-like surface states in topological insulators are protected by the time-reversal symmetry, which naturally forbids backscattering events during the carrier transport process, and therefore offers promising applications in dissipationless spintronic devices. Although considerable efforts have been devoted to controlling their surface conduction, limited work has been focused on tuning surface states and bulk carriers in Bi(2)Te(3) nanostructures by external field. Here we report gate-tunable surface conduction in Na-doped Bi(2)Te(3) topological insulator nanoplates. Significantly, by applying external gate voltages, such topological insulators can be tuned from p-type to n-type. Our results render a promise in finding novel topological insulators with enhanced surface states.
Flexible Carbon-Fiber/Semimetal Bi Nanosheet Arrays as Separable and Recyclable Plasmonic Photocatalysts and Photoelectrocatalysts
Publisher: American Chemical Society (ACS)
Date: 06-05-2020
Enhanced antibacterial property and osteo-differentiation activity on plasma treated porous polyetheretherketone with hierarchical micro/nano-topography
Publisher: Informa UK Limited
Date: 17-01-2018
DOI: 10.1080/09205063.2018.1425181
Abstract: Implantable polyetheretherketone (PEEK) has great biomedical potential as hard tissue substitute in orthopedic application due to its outstanding mechanical properties and excellent biological stability. However, the poor osseointegration and bacteriostatic ability of implantable PEEK become the major barrier for its wide clinic application. In this study, a hierarchically micro/nano-topographic PEEK with specific functional groups (amino and COOH/COOR) has been fabricated using facile sulfonation combined with argon plasma treatment. The new developed hierarchically micro/nano-topographic PEEK have enhanced hydrophilicity, surface roughness, as well as the high ability of apatite-layer forming. Antibacterial assessment shows that as-treated s les exhibit better antibacterial activity. The cellular responses in osteoblast-like MG-63 cells culturing experiment reveal that the micro/nano-topography accompanied with specific functional groups improves the cell adhesion at the initial stage, further ameliorates proliferation and osteogenic differentiation of MG-63. This study proposes a promising approach to increase osteo-differentiation activity and bacteriostasis of PEEK via synergistic effects involving surface topologic structure and chemical modification, which shows great potential in developing advanced implantable materials.
Synergistic Texturing and Bi/Sb-Te Antisite Doping Secure High Thermoelectric Performance in Bi0.5Sb1.5Te3-Based Thin Films
Publisher: Wiley
Date: 15-09-2021
Abstract: Bi 2 Te 3 ‐based thin films are attracting increasing attention due to their considerable wearability and flexibility feature. However, the relatively low performance compared to their bulk counterparts limits their development and wider application. In this work, synergistic texturing and Bi/Sb‐Te antisite doping are used to achieve a high room‐temperature ZT of ≈1.5 in p‐type Bi 0.5 Sb 1.5 Te 3 thin films by a magnetron sputtering method. Structural characterization confirms that carefully tuning the deposition temperature can strengthen the texture of as‐prepared polycrystalline Bi 0.5 Sb 1.5 Te 3 thin films, leading to significantly enhanced carrier mobility and electrical conductivity. Simultaneously, rational engineering of the deposition temperature can induce antisite doping between Bi/Sb and Te, which can reduce the carrier concentration and make it closer to the optimized level. In turn, a high power factor of 45.3 µW cm −1 K −2 and a maximized ZT of ≈1.5 at room temperature are obtained. This high power factor and ZT are highly competitive to other state‐of‐the‐art p‐type thin‐film‐based thermoelectric materials, showing great potentials for practical applications.
High-Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges
Publisher: Wiley
Date: 13-02-2020
Graphite Nanosheets as Multifunctional Nanoinclusions to Boost the Thermoelectric Performance of the Shear-Exfoliated Bi2O2Se
Publisher: Wiley
Date: 03-05-2022
Abstract: As an eco‐friendly oxide‐based thermoelectric material, Bi 2 O 2 Se exhibits considerable potential for practical device application, but its low electrical conductivity needs to be further improved to achieve higher thermoelectric performance. Here, a record‐high figure of merit, ZT of .7 at 773 K in the shear‐exfoliated nanostructured Bi 2 O 2 Se with graphite nanosheets as multifunctional secondary nanoinclusions, is achieved. The introduced graphite nanosheets regularize the arrangement of Bi 2 O 2 Se nanograins, strengthen the anisotropy, and act as the “expressway” to improve the electrical conductivity by simultaneously enhancing the electron carrier concentration and mobility of the hybrid materials, leading to a high power factor of ≈6.0 µW cm –1 K –2 at 773 K. Also, the liquid‐phase shear exfoliation refines both graphite and Bi 2 O 2 Se into nanosheets. Moreover, the as‐sintered hybrid bulk materials composed of these nanosheets possess dense grain and phase boundaries, as well as various lattice imperfections, such as lattice distortions and stacking faults formed by physical shearing, which can significantly scatter the phonons with different wavelengths and in turn contribute to a low thermal conductivity of only 0.63 W m –1 K –1 at 773 K, both contributing to a competitive ZT of ≈0.73 at this temperature, indicating the great potential for practical applications.
Nitrogen-doped titania nanosheets towards visible light response
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B820483G
Solvothermally silver doping boosting the thermoelectric performance of polycrystalline Bi2Te3
Publisher: Elsevier BV
Date: 11-2023
SrTiO3-based thermoelectrics: Progress and challenges
Publisher: Elsevier BV
Date: 12-2020
Empowering Metal Phosphides Anode with Catalytic Attribute toward Superior Cyclability for Lithium-Ion Storage
Publisher: Wiley
Date: 27-02-2019
Applications of Thermoelectric Generators To Improve Catalytic-Assisted Hydrogen Production Efficiency: Future Directions
Publisher: American Chemical Society (ACS)
Date: 21-07-2022
Preparation of High Purity ZnO Nanobelts by Thermal Evaporation of ZnS
Publisher: American Scientific Publishers
Date: 03-2006
DOI: 10.1166/JNN.2006.129
Abstract: High purity one-dimensional ZnO nanobelts were synthesized by thermally evaporating commercial ZnS powders in a hydrogen–oxygen mixture gas at 1050 °C. It was found that these ZnO nanobelts had a single crystal hexagonal wurtzite structure growing along the [0001] direction. They had a rectangle-shaped cross-section with typical widths of 20 to 100 nanometers and lengths of up to hundreds of micrometers with lattice constants of a = 0.325 nm and c = 0.520 nm. The self-catalytic hydrogen–oxygen assisted growth of ZnO nanobelt is discussed. The photoluminescence (PL) characterization of the ZnO nanobelts shows strong near-band UV emission (about 383 nm) and one broad peak at 501 nm, which indicates that the ZnO nanobelts have good potential application in optoelectronic devices.
Optimizing Electronic Quality Factor toward High-Performance Ge1-x-yTaxSbyTe Thermoelectrics: The Role of Transition Metal Doping
Publisher: Wiley
Date: 16-08-2021
Abstract: Owing to high intrinsic figure‐of‐merit implemented by multi‐band valleytronics, GeTe‐based thermoelectric materials are promising for medium‐temperature applications. Transition metals are widely used as dopants for developing high‐performance GeTe thermoelectric materials. Herein, relevant work is critically reviewed to establish a correlation among transition metal doping, electronic quality factor, and figure‐of‐merit of GeTe. From first‐principle calculations, it is found that Ta, as an undiscovered dopant in GeTe, can effectively converge energy offset between light and heavy conduction band extrema to enhance effective mass at high temperature. Such manipulation is verified by the increased Seebeck coefficient of synthesized Ge 1− x − y Ta x Sb y Te s les from 160 to 180 µV K −1 at 775 K upon doping Ta, then to 220 µV K −1 with further alloying Sb. Characterization using electron microscopy also reveals the unique herringbone structure associated with multi‐scale lattice defects induced by Ta doping, which greatly hinder phonon propagation to decrease thermal conductivity. As a result, a figure‐of‐merit of ≈2.0 is attained in the Ge 0.88 Ta 0.02 Sb 0.10 Te s le, reflecting a maximum heat‐to‐electricity efficiency up to 17.7% under a temperature gradient of 400 K. The rationalized beneficial effects stemming from Ta doping is an important observation that will stimulate new exploration toward high‐performance GeTe‐based thermoelectric materials.
Self-Standing Film Assembled using SnS–Sn/Multiwalled Carbon Nanotubes Encapsulated Carbon Fibers: A Potential Large-Scale Production Material for Ultra-stable Sodium-Ion Battery Anodes
Publisher: American Chemical Society (ACS)
Date: 09-06-2021
Cracking Behavior and Mechanism of Gibbsite Crystallites during Calcination
Publisher: Wiley
Date: 04-12-2019
Atomic Investigation on the Facet-Dependent Melting of Ceramic Nanostructures via In Situ Electron Irradiation
Publisher: Wiley
Date: 12-05-2020
Establishing the Golden Range of Seebeck Coefficient for Maximizing Thermoelectric Performance (vol 142, pg 2672, 2020)
Publisher: American Chemical Society (ACS)
Date: 02-06-2020
DOI: 10.1021/JACS.0C05548
Recovery TiO 2 and sodium titanate nanowires as Cd(II) adsorbent from waste V 2 O 5 -WO 3 /TiO 2 selective catalytic reduction catalysts by Na 2 CO 3 -NaCl-KCl molten salt roasting method
Publisher: Elsevier BV
Date: 07-2018
Ternary Ag2Se1–xTex: A Near-Room-Temperature Thermoelectric Material with a Potentially High Figure of Merit
Publisher: American Chemical Society (ACS)
Date: 02-09-2021
Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates
Publisher: American Chemical Society (ACS)
Date: 10-03-2009
DOI: 10.1021/CM802986R
Paramagnetic Cu-doped Bi2Te3 nanoplates
Publisher: AIP Publishing
Date: 03-02-2014
DOI: 10.1063/1.4863966
Abstract: Uniform Cu-doped Bi2Te3 hexagonal nanoplates with widths of ∼200 nm and thicknesses of ∼20 nm were synthesized using a solvothermal method. According to the structural characterization and compositional analysis, the Cu2+ ions were found to substitute Bi3+ ions in the lattice. High-level Cu doping induces a lattice distortion and decreases the crystal lattice by 1.17% in the a axis and 2.38% in the c axis. A paramagnetic state is observed in these nanoplates from 2 to 295 K, which is a significant difference from their diamagnetic un-doped Bi2Te3.
Thermal-inert and ohmic-contact interface for high performance half-Heusler based thermoelectric generator
Publisher: Springer Science and Business Media LLC
Date: 14-12-2022
DOI: 10.1038/S41467-022-35290-6
Abstract: Unsatisfied electrode bonding in half-Heusler devices renders thermal damage and large efficiency loss, which limits their practical service at high temperatures. Here, we develop a thermodynamic strategy to screen barrier layer elements. Theoretically, we found that the interface between VIIB elements and half-Heuslers possesses near-zero interfacial reaction energy and large atomic diffusion barrier. Experimentally, such an interphase proves to be the atomic direct bonding and has high thermal stability at 1073 K, leading to ideal ohmic contact. Such thermally inert and ohmic contact interface enable modules stably to work at elevated temperature up to 1100 K, which releases the peak performance of half-Heuslers and in turn boosts the energy conversion efficiencies to the records of 11.1% and 13.3% for half-Heusler single-stage and half-Heusler/Bi 2 Te 3 segmented modules. This design strategy provides a feasible solution for the high-temperature half-Heusler generators and gives enlightenment for other package interconnection design of electronic devices.
Boosting the thermoelectric performance of p-type heavily Cu-doped polycrystalline SnSe via inducing intensive crystal imperfections and defect phonon scattering
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8SC02397B
Abstract: In this study, we, for the first time, report a high Cu solubility of 11.8% in single crystal SnSe microbelts synthesized via a facile solvothermal route.
ZnS nanostructures for field emitters
Publisher: IEEE
Date: 02-2010
ZnO-CdS@Cd Heterostructure for Effective Photocatalytic Hydrogen Generation
Publisher: Wiley
Date: 12-12-2012
Enhanced thermoelectric performance of n-type Nb-doped PbTe by compensating resonant level and inducing atomic disorder
Publisher: Elsevier BV
Date: 05-2022
Synergistic Effect of Band and Nanostructure Engineering on the Boosted Thermoelectric Performance of n‐Type Mg3+δ(Sb, Bi)2 Zintls
Publisher: Wiley
Date: 31-05-2022
Abstract: Thermoelectric Mg 3+ δ (Sb, Bi) 2 Zintls have attracted significant attention because of their high‐performing, eco‐friendly, and cost‐effective features, but their thermoelectric properties still need improvement for application to practical devices. Here an outstanding ZT of ≈1.87 at 773 K and a high average ZT of ≈1.2 in n‐type Y‐doped Mg 3.2 Sb 1.5 Bi 0.49 Se 0.01 are reported, both of which rank as top values among the reported literature. First‐principles calculations indicate that substituting the Mg site with Y shifts the Fermi level into the conduction band and simultaneously narrows the bandgap, both strengthening the n‐type semiconducting feature and boosting the electron carrier density of Mg 3.2 Sb 1.5 Bi 0.49 Se 0.01 . A high power factor of ≈21.4 µW cm –1 K –2 is achieved at 773 K in Mg 3.18 Y 0.02 Sb 1.5 Bi 0.49 Se 0.01 , benefiting from the rationally tuned carrier density of ≈7.7 × 10 19 cm –3 at this temperature. In addition, the doped Ys act as point defects to cause significant lattice distortions and strains, confirmed by comprehensive micro/nanostructure characterizations. These lattice imperfections suppress the lattice thermal conductivity to ≈0.41 W m –1 K –1 at 773 K, leading to such a high ZT . Furthermore, a high energy conversion efficiency of ≈13.8% is predicted by a temperature gradient of 450 K, indicating a great potential to be applied to practical devices for mid‐temperature applications.
Fabrication and visible emission of single-crystal diameter-modulated gallium phosphide nanochains
Publisher: AIP Publishing
Date: 15-06-2010
DOI: 10.1063/1.3452378
Abstract: The diameter-modulated single crystalline gallium phosphide (GaP) nanochains were synthesized by a facile method within a confined reaction zone. By varying the Ga concentration in the reaction zone, the size of knots of GaP nanochains can be manipulated. These zinc-blende structured GaP nanochains with ⟨111⟩ axial directions possess strong visible emissions around 700 nm at room temperature, indicating their potential applications in light sources, laser or light emitting display devices.
Growth of Magnetic Yard‐Glass Shaped Boron Nitride Nanotubes with Periodic Iron Nanoparticles
Publisher: Wiley
Date: 04-10-2007
Double perovskite Pr2CoFeO6 thermoelectric oxide: Roles of Sr-doping and Micro/nanostructuring
Publisher: Elsevier BV
Date: 12-2021
Room-temperature chiral charge pumping in Dirac semimetals
Publisher: Springer Science and Business Media LLC
Date: 09-01-2017
DOI: 10.1038/NCOMMS13741
Abstract: Chiral anomaly, a non-conservation of chiral charge pumped by the topological nontrivial gauge fields, has been predicted to exist in Weyl semimetals. However, until now, the experimental signature of this effect exclusively relies on the observation of negative longitudinal magnetoresistance at low temperatures. Here, we report the field-modulated chiral charge pumping process and valley diffusion in Cd 3 As 2 . Apart from the conventional negative magnetoresistance, we observe an unusual nonlocal response with negative field dependence up to room temperature, originating from the diffusion of valley polarization. Furthermore, a large magneto-optic Kerr effect generated by parallel electric and magnetic fields is detected. These new experimental approaches provide a quantitative analysis of the chiral anomaly phenomenon which was inaccessible previously. The ability to manipulate the valley polarization in topological semimetal at room temperature opens up a route towards understanding its fundamental properties and utilizing the chiral fermions.
Effect of titanium based complex catalyst and carbon nanotubes on hydrogen storage performance of magnesium
Publisher: Springer Science and Business Media LLC
Date: 28-02-2013
CdS/CdSe lateral heterostructure nanobelts by a two-step physical vapor transport method
Publisher: IOP Publishing
Date: 10-03-2010
DOI: 10.1088/0957-4484/21/14/145602
Abstract: The two-dimensional heterostructure nanobelts with a central CdSe region and lateral CdS structures are synthesized by a two-step physical vapor transport method. The large growth rate difference between lateral CdS structures on both +/- (0001) sides of the CdSe region is found. The growth anisotropy is discussed in terms of the polar nature of the side +/- (0001) surfaces of CdSe. High-resolution transmission electron microscopy reveals the CdSe central region covered with non-uniform CdS layer/islands. From micro-photoluminescence measurements, a systematic blueshift of emission energy from the central CdSe region in accordance with the increase of lateral CdS growth temperature is observed. This result indicates that the intermixing rate in the CdSe region with CdS increases with the increase of lateral CdS growth temperature. In conventional CdSSe ternary nanostructures, morphology and emission wavelength were correlated parameters. However, the morphology and emission wavelength are independently controllable in the CdS/CdSe lateral heterostructure nanobelts. This structure is attractive for applications in visible optoelectronic devices.
Achieving high-performance n-type PbTe via synergistically optimizing effective mass and carrier concentration and suppressing lattice thermal conductivity
Publisher: Elsevier BV
Date: 2022
Graphene/Quantum Dot Heterostructure Photodetectors: From Material to Performance
Publisher: Wiley
Date: 11-10-2022
Abstract: Owing to its high carrier mobility, electrical conductivity, and thermal/chemical stability, graphene is an ideal candidate material for photodetection. However, the weak light absorption of graphene significantly limits its practical applications in photodetectors. Quantum dots, with strong light‐absorption capacity and well‐adjustable band gap, are widely hybridized with graphene to realize wide‐range and intense light absorption for effective photodetection. A detailed literature review on graphene/quantum dot heterostructure photodetectors is in urgent need to clearly point out the fundamentals, material synthesis methods, and performance engineering strategies. Here, first, the significance of graphene/quantum dot heterostructure photodetectors, from the mechanism to performance indicators, is systematically discussed. Second, different synthesis methodologies for the graphene/quantum dot heterostructure are overviewed. Additionally, the engineering strategies, including surface treatment, chemical doping, and size modification, to tune the photoelectric performance are critically commented. Finally, challenges and outlook for the development of graphene/quantum dot heterostructure photodetectors are pointed out.
Carrier Transport Enhancement Mechanism in Highly Efficient Antimony Selenide Thin‐Film Solar Cell
Publisher: Wiley
Date: 15-01-2023
Abstract: Exhibiting outstanding optoelectronic properties, antimony selenide (Sb 2 Se 3 ) has attracted considerable interest and has been developed as a light absorber layer for thin‐film solar cells over the decade. However, current state‐of‐the‐art Sb 2 Se 3 devices suffer from unsatisfactory “cliff‐like” band alignment and severe interface recombination loss, which deteriorates device performance. In this study, the heterojunction interface of an Sb 2 Se 3 solar cell is improved by introducing effective aluminum (Al 3+ ) cation into the CdS buffer layer. Then, the energy band alignment of Sb 2 Se 3 /CdS:Al heterojunction is modified from a “cliff‐like” structure to a “spike‐like” structure. Finally, heterojunction interface engineering suppresses recombination losses and strengthens carrier transport, resulting in a high efficiency of 8.41% for the substrate‐structured Sb 2 Se 3 solar cell. This study proposes a facile strategy for interfacial treatment and elucidates the related carrier transport enhancement mechanism, paving a bright avenue to overcome the efficiency bottleneck of Sb 2 Se 3 thin‐film solar cells.
Growth of ZnS heterostructures for optoelectronic applications
Publisher: IEEE
Date: 12-2010
Effects of Initial Texture on Rolling Texture and Property of Electrodeposited Nickel Plate
Publisher: American Scientific Publishers
Date: 09-2015
Advances in Ag2Se-based thermoelectrics from materials to applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE00378G
Abstract: Thermoelectric materials and their devices can realize the solid-state energy conversion between thermal and electrical energy, therefore serving as a promising alternative to conventional fossil fuels for energy supply.
Flexible, recoverable, and efficient photocatalysts: MoS2/TiO2 heterojunctions grown on amorphous carbon-coated carbon textiles
Publisher: Elsevier BV
Date: 12-2023
High-tensile-strength and ductile novel Ti-Fe-N-B alloys reinforced with TiB nanowires
Publisher: Elsevier BV
Date: 12-2017
Correction: Two-dimensional nanocoating-enabled orthopedic implants for bimodal therapeutic applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR90183K
Abstract: Correction for ‘Two-dimensional nanocoating-enabled orthopedic implants for bimodal therapeutic applications’ by Song Wang et al. , Nanoscale , 2020, 12 , 11936–11946, DOI: 10.1039/D0NR02327B.
Tunable Ambipolar Polarization-Sensitive Photodetectors Based on High-Anisotropy ReSe2 Nanosheets
Publisher: American Chemical Society (ACS)
Date: 03-08-2016
Abstract: Atomically thin 2D-layered transition-metal dichalcogenides have been studied extensively in recent years because of their intriguing physical properties and promising applications in nanoelectronic devices. Among them, ReSe2 is an emerging material that exhibits a stable distorted 1T phase and strong in-plane anisotropy due to its reduced crystal symmetry. Here, the anisotropic nature of ReSe2 is revealed by Raman spectroscopy under linearly polarized excitations in which different vibration modes exhibit pronounced periodic variations in intensity. Utilizing high-quality ReSe2 nanosheets, top-gate ReSe2 field-effect transistors were built that show an excellent on/off current ratio exceeding 10(7) and a well-developed current saturation in the current-voltage characteristics at room temperature. Importantly, the successful synthesis of ReSe2 directly onto hexagonal boron nitride substrates has effectively improved the electron motility over 500 times and the hole mobility over 100 times at low temperatures. Strikingly, corroborating with our density-functional calculations, the ReSe2-based photodetectors exhibit a polarization-sensitive photoresponsivity due to the intrinsic linear dichroism originated from high in-plane optical anisotropy. With a back-gate voltage, the linear dichroism photodetection can be unambiguously tuned both in the electron and hole regime. The appealing physical properties demonstrated in this study clearly identify ReSe2 as a highly anisotropic 2D material for exotic electronic and optoelectronic applications.
Polycrystalline NiSe-Alloyed SnSe with Improved Medium-Temperature Thermoelectric Performance
Publisher: American Chemical Society (ACS)
Date: 04-05-2022
Simultaneously achieving high ZT and mechanical hardness in highly alloyed GeTe with symmetric nanodomains
Publisher: Elsevier BV
Date: 08-2022
Metallic and Ionic Fe Induced Growth of Si−SiOx Core−Shell Nanowires
Publisher: American Chemical Society (ACS)
Date: 19-08-2010
DOI: 10.1021/JP105952M
High activity electrocatalysts from metal–organic framework-carbon nanotube templates for the oxygen reduction reaction
Publisher: Elsevier BV
Date: 02-2015
Sulfur-doped gallium phosphide nanowires and their optoelectronic properties
Publisher: IOP Publishing
Date: 17-08-2010
DOI: 10.1088/0957-4484/21/37/375701
Abstract: Sulfur-doped gallium phosphide nanowires were synthesized in a high yield by a facile sublimation of ball-milled mixture powders in a confined reaction zone. The nanowires have diameters in the range of 50-200 nm and lengths up to tens of micrometers. They consist of single-crystalline zinc blende structure crystals with a (111) growth direction. Electron energy-loss spectroscopy reveals that the sulfur doping occurs in the uniform forms of the body. Amorphous Ga-O containing a self-catalyst growth mechanism is proposed based on the detailed characterizations. Photoluminescence shows strong visible emissions at room temperature, indicating their potential applications in light sources, laser or light emitting display devices.
Flexible hollow TiO2 @CMS/carbon-fiber van der Waals heterostructures for simulated-solar light photocatalysis and photoelectrocatalysis
Publisher: Elsevier BV
Date: 2022
Environmentally-friendly harvesting TiO2 nanospheres and V2O5 microrods from spent selective catalytic reduction catalysts
Publisher: Elsevier BV
Date: 12-2021
Science in brief: Highlights from the applied physiology, muscle and genetics abstracts at the International Conference on Equine Exercise Physiology.
Publisher: Wiley
Date: 10-12-2016
DOI: 10.1111/EVJ.12484
The role of NH3 atmosphere in preparing nitrogen-doped TiO2 by mechanochemical reaction
Publisher: Elsevier BV
Date: 2006
Self-standing and high-performance B4C/Sn/acetylene black@reduced graphene oxide films as sodium-ion half/full battery anodes
Publisher: Elsevier BV
Date: 09-2021
Carbon allotrope hybrids advance thermoelectric development and applications
Publisher: Elsevier BV
Date: 05-2021
Advances in the design and assembly of flexible thermoelectric device
Publisher: Elsevier BV
Date: 2023
Formation mechanism of titania based opacified glaze with novel core-shell nanostructure
Publisher: Elsevier BV
Date: 04-2019
Synthesis of boron nitride nanotubes by an oxide-assisted chemical method
Publisher: Springer Science and Business Media LLC
Date: 19-11-2009
Multifunctional Wearable Thermoelectrics for Personal Thermal Management
Publisher: Wiley
Date: 16-03-2022
Abstract: With the ever‐increasing demand for wearable electronics and energy‐saving technologies, self‐powered thermoelectric personal thermal management (PTM) has attracted extensive research interest. In this review, the unique characteristics of thermoelectric PTM comparing with other technologies are first highlighted, and the key parameters and fundamental functions of thermoelectric PTM are systematically summarized. Then, the advances in thermoelectric PTM are overviewed from the material design to the wearable device design viewpoints. Finally, the key challenges and future research directions of thermoelectric PTM, where both high‐performance flexible materials and proper device designs are in urgent need, are pointed out. This review will deliver a systematic understanding and guideline for thermoelectric PTM.
Correction to “Strong Phonon–Phonon Interactions Securing Extraordinary Thermoelectric Ge1–xSbxTe with Zn-Alloying-Induced Band Alignment”
Publisher: American Chemical Society (ACS)
Date: 03-10-2019
DOI: 10.1021/JACS.9B10240
Crowding-out effect strategy using AgCl for realizing a super low lattice thermal conductivity of SnTe
Publisher: Elsevier BV
Date: 09-2020
Arrayed Van Der Waals Broadband Detectors for Dual‐Band Detection
Publisher: Wiley
Date: 16-02-2017
Abstract: An advanced visible/infrared dual-band photodetector with high-resolution imaging at room temperature is proposed and demonstrated for intelligent identification based on the 2D GaSe/GaSb vertical heterostructure. It resolves the challenges of producing large-scale 2D growth, achieving fast response speed, outstanding detectivity, and lower manufacture cost, which are the main obstacles for industrialization of 2D-materials-based photodetection.
Ultrafast and Cost-Effective Fabrication of High-Performance Carbon-Based Flexible Thermoelectric Hybrid Films and Their Devices
Publisher: American Chemical Society (ACS)
Date: 17-05-2023
Interstitial Cu: An Effective Strategy for High Carrier Mobility and High Thermoelectric Performance in GeTe
Publisher: Wiley
Date: 10-03-2023
Abstract: Dense point defects can strengthen phonon scattering to reduce the lattice thermal conductivity and induce outstanding thermoelectric performance in GeTe‐based materials. However, extra point defects inevitably enlarge carrier scattering and deteriorate carrier mobility. Herein, it is found that the interstitial Cu in GeTe can result in synergistic effects, which include: 1) strengthened phonon scattering, leading to ultralow lattice thermal conductivity of 0.48 W m −1 K −1 at 623 K 2) weakened carrier scattering, contributing to high carrier mobility of 80 cm 2 V −1 s −1 at 300 K 3) optimized carrier concentration of 1.22 × 10 20 cm −3 . Correspondingly, a high figure‐of‐merit of ≈2.3 at 623 K can be obtained in the Ge 0.93 Ti 0.01 Bi 0.06 Te‐0.01Cu, which corresponds to a maximum energy conversion efficiency of ≈10% at a temperature difference of 423 K. This study systematically investigates the doping behavior of the interstitial Cu in GeTe‐based thermoelectric materials for the first time and demonstrates that the localized interstitial Cu is a new strategy to enhance the thermoelectric performance of GeTe‐based thermoelectric materials.
Advanced Thermoelectric Design: From Materials and Structures to Devices
Publisher: American Chemical Society (ACS)
Date: 02-07-2020
Thermoelectrics for medical applications: Progress, challenges, and perspectives
Publisher: Elsevier BV
Date: 06-2022
Rational Design of Bi2Te3 Polycrystalline Whiskers for Thermoelectric Applications
Publisher: American Chemical Society (ACS)
Date: 24-12-2014
DOI: 10.1021/AM5078528
Abstract: Bi2Te3 polycrystalline whiskers consisting of interconnected nanoplates have been synthesized through chemical transformation from In2Te3 polycrystalline whisker templates assembled by nanoparticles. The synthesized Bi2Te3 whiskers preserve the original one-dimensional morphology of the In2Te3, while the In2Te3 nanoparticles can be transformed into the Bi2Te3 thin nanoplates, accompanied by the formation of high-density interfaces between nanoplates. The hot-pressed nanostructures consolidated from Bi2Te3 polycrystalline whiskers at 400 °C demonstrate a promising figure of merit (ZT) of 0.71 at 400 K, which can be attributed to their low thermal conductivity and relatively high electrical conductivity. The small nanoparticles inherited from the polycrystalline whiskers and high-density nanoparticle interfaces in the hot-pressed nanostructures contribute to the significant reduction of thermal conductivity. This study provides a rational chemical transformation approach to design and synthesize polycrystalline microstructures for enhanced thermoelectric performances.
Bioinspired and osteopromotive polydopamine nanoparticle-incorporated fibrous membranes for robust bone regeneration
Publisher: Springer Science and Business Media LLC
Date: 12-07-2019
DOI: 10.1038/S41427-019-0139-5
Abstract: Due to their inherent hydrophobic and bioinert nature, synthetic degradable polymer-based membranes show inferior stem cell attachment, proliferation, and even differentiation. To overcome these limitations, bioinspired and osteopromotive polydopamine nanoparticle-incorporated fibrous membranes are developed via a two-step route: pH-induced polymerization of dopamine and co-electrospinning of polycaprolactone (PCL) with polydopamine nanoparticles (PDA NPs). Hybrid membranes with optimized PDA NP content exhibit high quantities of apatite deposition and prominent cytocompatibility (cell attachment, spreading and reproduction) and osteo-differentiation potential (alkaline phosphatase activity, calcium mineralization, and osteogenesis-related genes and protein expression) of human mesenchymal stem cells cultured without any growth factors. Importantly, in vivo assessments using a mouse calvarial critical-sized defect demonstrate that the engineered fibrous membranes remarkably boost bone reconstruction and regeneration. Accordingly, our bioinspired PCL-based hybrid fibrous membranes with robust osteoinductive ability can potentially be utilized as a clinically applicable candidate in guided tissue regeneration applications.
Superconductivity and magnetotransport of single-crystalline NbSe2nanoplates grown by chemical vapour deposition
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR06617A
Abstract: High-quality NbSe 2 nanoplates can be grown by a facile chemical vapour deposition method, exhibiting a two-dimensional characteristic in their superconductivities.
Diameter-selective growth of single-walled carbon nanotubes with high quality by floating catalyst method
Publisher: American Chemical Society (ACS)
Date: 07-08-2008
DOI: 10.1021/NN8003394
Abstract: High-quality single-walled carbon nanotubes (SWNTs) with tunable diameters were synthesized by an improved H(2)/CH(4)-based floating catalyst method. Transmission electron microscopy observations and Raman results demonstrated the overall quality of the as-synthesized s les with finely tailored large diameters at 1.28, 1.62, 1.72, 1.91, and 2.13 nm, depending on the experimental conditions. In addition, Raman analysis revealed that the abundance of specific (n, m) SWNTs could be selectively enriched simultaneously along with the diameter modulation. It was found that the selective etching effects of high hydrogen flow stabilized the decomposition of ultralow CH(4) flow and considerably suppressed the deposition of amorphous carbon and small nanotubes, leading to very pure s les with high structural homogeneity suitable for further applications in practical electronic systems.
Effectively restricting MnSi precipitates for simultaneously enhancing the Seebeck coefficient and electrical conductivity in higher manganese silicide
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC01937E
Abstract: Introducing Mg 2 Si into higher manganese silicide synthesis successfully suspended the precipitation of MnSi, leading to reduced effective mass, reduced optimized carrier concentration, and enhanced figure of merit, zT .
Nanostructured monoclinic Cu2Se as a near-room-temperature thermoelectric material
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR05829G
Abstract: Nanostructured monoclinic Cu 2 Se with low thermal conductivity shows a figure of merit of 0.72 at 380 K.
Periodicity Dependence of the Built-in Electric Field in (Ba0.7Ca0.3)TiO3/Ba(Zr0.2Ti0.8)O-3 Ferroelectric Super lattices
Publisher: American Chemical Society (ACS)
Date: 17-11-2015
Abstract: Symmetric ferroelectric superlattices consisting of (Ba0.7Ca0.3)TiO3 (BCT) and Ba(Zr0.2Ti0.8)O3 (BZT) layers were successfully grown on La0.7Sr0.3MnO3 electroded (001)-oriented SrTiO3 substrates by laser molecular beam epitaxy. With the monitor of reflective high-energy electron diffraction, the growth mode and rate were precisely controlled to realize the desired superlattice periodicity as confirmed by both X-ray diffraction and transmission electron microscopy results. The microscopic piezoelectric response and macroscopic ferroelectric properties were investigated as a function of periodicity of the BCTm/BZTm (m = 3, 5, 10, and 15 unit cells) superlattices. The existence of a built-in electric field was confirmed in all the superlattices and its strength was highly dependent on the periodicity. The excellent tunability of built-in electric field opens a path for designing microelectronic devices with various functionalities based on BCTm/BZTm superlattices.
Synergistic band convergence and defect engineering boost thermoelectric performance of SnTe
Publisher: Elsevier BV
Date: 09-2021
Observations of a Metal-Insulator Transition and Strong Surface States in Bi2-xSbxSe3 Thin Films
Publisher: Wiley
Date: 10-09-2014
Abstract: High-quality thin films of the topological insulator Bi2-xSbxSe3 are grown by molecular beam epitaxy. A metal-insulator transition along with strong surface states - revealed by Shubnikov-de Haas oscillations - is observed as the Sb concentration is increased. This system represents a widely tunable platform for achieving high surface conduction, suppressing the bulk influence, and manipulating the band structure of topological insulators.
Hot-Filament-Assisted Growth of Straight SiOx Nanowires for Optoelectronic Application
Publisher: American Chemical Society (ACS)
Date: 27-06-2013
DOI: 10.1021/JP403588P
Chemistry in Advancing Thermoelectric GeTe Materials
Publisher: American Chemical Society (ACS)
Date: 12-10-2022
DOI: 10.1021/ACS.ACCOUNTS.2C00467
Abstract: ConspectusThe ever-growing energy crisis and the deteriorated environment caused by carbon energy consumption motivate the exploitation of alternative green and sustainable energy supplies. Because of the unique advantages of zero-emission, no moving parts, accurate temperature control, a long steady-state operation period, and the ability to operate in extreme situations, thermoelectrics, enabling the direct conversion between heat and electricity, is a promising and sustainable option for power generation and refrigeration. However, with increasing application potentials, thermoelectrics is now facing a major challenge: developing high-performance, Pb-free, and low-toxic thermoelectric materials and devices.As one group of promising candidates, GeTe derivatives have the potential to replace the widely used thermoelectric materials containing highly toxic elements. In this Account, we summarize our recent progress in developing high-performance GeTe-based thermoelectric materials via exploring innovative strategies to enhance electron transports and d en phonon propagations. First, we fundamentally illustrate the underlying chemistry and physical reason for an intrinsically high carrier concentration in GeTe, which enormously restrains the thermoelectric performance of GeTe. From our theoretical calculations, the formation energy of Ge vacancy is the lowest among the defects in GeTe, energetically favoring Ge vacancies in the lattice and leading to intrinsically high carrier concentrations. Accordingly, aliovalent doping/alloying is proposed to increase the formation energy of Ge vacancies and decrease the carrier concentration to the optimal level. We then outline the newly developed method to refine the band structures of GeTe with tuned electronic transport. On the basis of the molecular orbital theory, the energy offset between two valence band edges at the L and Σ points in GeTe should be ascribed to the slightly different Ge_4s orbital characters at these two points, which guides the screening of dopants for band convergence. Besides, the Rashba spin splitting is explored to increase the band degeneracy of GeTe. Afterward, we analyze the d ened phonon propagation in GeTe to minimize its lattice thermal conductivity. Alloying with the heavy Sb atoms can shift the optical phonon modes toward low frequency and reinforce the interaction of optical and acoustic phonon modes so that the inherent phonon scattering is enhanced. In addition, planar vacancies and superlattice precipitates can significantly strengthen phonon scattering to result in ultralow lattice thermal conductivity. After that, we overview the finite elemental analysis simulations to optimize the device geometry for maximizing the device performance and introduce the as-developed prototype GeTe-based thermoelectric device. In the end, we point out future directions in the development of GeTe for device applications. The strategies summarized in this Account can serve as references for developing wide materials with enhanced thermoelectric performance.
Synthesis of thermoelectric materials
Publisher: Elsevier
Date: 2021
Synthesis and photoluminescence of tetrapod ZnO nanostructures
Publisher: Elsevier BV
Date: 02-2007
First-principles atomistic Wulff constructions for an equilibrium rutile TiO2 shape modeling
Publisher: Elsevier BV
Date: 04-2018
Drastically enhanced photocatalytic activity in nitrogen doped mesoporous TiO2 with abundant surface states
Publisher: Elsevier BV
Date: 06-2009
DOI: 10.1016/J.JCIS.2009.02.047
Abstract: Nitrogen doped mesoporous TiO(2) was prepared via a modified two-step hydrothermal route. In contrast to undoped mesoporous TiO(2), nitrogen doped mesoporous TiO(2) has superior photocatalytic activity under both UV and visible light irradiation. Photoluminescence spectra reveal that nitrogen doped mesoporous TiO(2) possesses abundant surface states, which can play a vital role in trapping photoinduced carriers as evidenced by photoelectrochemical process and prolonging the lifetime of the carriers. The remarkably enhanced photocatalytic activity in nitrogen doped mesoporous TiO(2) is attributed to the generated abundant surface states.
Thermoelectric Performance of Se/Cd Codoped SnTe via Microwave Solvothermal Method
Publisher: American Chemical Society (ACS)
Date: 29-06-2017
Abstract: Extensive attention has been focused on thermoelectric performance optimization of SnTe because of its potential in waste heat recovery. Here, we fabricate high thermoelectric performance Se/Cd codoped SnTe octahedral particles by microwave-stimulated solvothermal method. The SnTe-based octahedral particles have sizes ranging from several micrometers to hundreds of nanometers, forming dense bulks after spark plasma sintering. Combined with the strong point defect scattering by Se and Cd dopants, a low thermal conductivity of 1.8 W m
Synthesis of GaPO4-GaN Coaxial Nanowires
Publisher: Elsevier BV
Date: 2010
Thermoelectric coolers for on-chip thermal management: Materials, design, and optimization
Publisher: Elsevier BV
Date: 10-2022
An A‐Site‐Deficient Perovskite offers High Activity and Stability for Low‐Temperature Solid‐Oxide Fuel Cells
Publisher: Wiley
Date: 23-10-2013
Abstract: Solid oxide fuel cells (SOFCs) directly convert fossil and/or renewable fuels into electricity and/or high-quality heat in an environmentally friendly way. However, high operating temperatures result in high cost and material issues, which have limited the commercialization of SOFCs. To lower their operating temperatures, highly active and stable cathodes are required to maintain a reasonable power output. Here, we report a layer-structured A-site deficient perovskite Sr0.95 Nb0.1 Co0.9 O3-δ (SNC0.95) prepared by solid-state reactions that shows not only high activity towards the oxygen reduction reaction (ORR) at operating temperatures below 600 °C, but also offers excellent structural stability and compatibility, and improved CO2 resistivity. An anode-supported fuel cell with SNC0.95 cathode delivers a peak power density as high as 1016 mW cm(-2) with an electrode-area-specific resistance of 0.052 Ω cm(2) at 500 °C.
Achieving zT > 2 in p-Type AgSbTe2-xSex Alloys via Exploring the Extra Light Valence Band and Introducing Dense Stacking Faults
Publisher: Wiley
Date: 18-12-2018
Abstract: Through simultaneously enhancing the power factor by engineering the extra light band and enhancing phonon scatterings by introducing a high density of stacking faults, a record figure‐of‐merit over 2.0 is achieved in p‐type AgSbTe 2− x Se x alloys. Density functional theory calculations confirm the presence of the light valence band with large degeneracy in AgSbTe 2 , and that alloying with Se decreases the energy offset between the light valence band and the valence band maximum. Therefore, a significantly enhanced power factor is realized in p‐type AgSbTe 2− x Se x alloys. In addition, transmission electron microscopy studies indicate the appearance of stacking faults and grain boundaries, which together with grain boundaries and point defects significantly strengthen phonon scatterings, leading to an ultralow thermal conductivity. The synergetic strategy of simultaneously enhancing power factor and strengthening phonon scattering developed in this study opens up a robust pathway to tailor thermoelectric performance.
Impacts of Cu deficiency on the thermoelectric properties of Cu2−XSe nanoplates
Publisher: Elsevier BV
Date: 07-2016
Cheap, Large-Scale, and High-Performance Graphite-Based Flexible Thermoelectric Materials and Devices with Supernormal Industry Feasibility
Publisher: American Chemical Society (ACS)
Date: 07-02-2022
Abstract: Flexible thermoelectric materials and devices show great potential to solve the energy crisis but still face great challenges of high cost, complex fabrication, and tedious postprocessing. Searching for abnormal thermoelectric materials with rapid and scale-up production can significantly accelerate their applications. Here, we develop superlarge 25 × 20 cm
Structural evolution of graphene quantum dots during thermal decomposition of citric acid and the corresponding photoluminescence
Publisher: Elsevier BV
Date: 02-2015
Controllable Growth of Vertical Heterostructure GaTexSe1–x/Si by Molecular Beam Epitaxy
Publisher: American Chemical Society (ACS)
Date: 04-08-2015
Abstract: Two dimensional (2D) alloys, especially transition metal dichalcogenides, have attracted intense attention owing to their band-gap tunability and potential optoelectrical applications. Here, we report the controllable synthesis of wafer-scale, few-layer GaTexSe1-x alloys (0 ≤ x ≤ 1) by molecular beam epitaxy (MBE). We achieve a layer-by-layer growth mode with uniform distribution of Ga, Te, and Se elements across 2 in. wafers. Raman spectroscopy was carried out to explore the composition-dependent vibration frequency of phonons, which matches well with the modified random-element-isodisplacement model. Highly efficient photodiode arrays were also built by depositing few-layer GaTe0.64Se0.36 on n-type Si substrates. These p-n junctions have steady rectification characteristics with a rectifying ratio exceeding 300 and a high external quantum efficiency around 50%. We further measured more devices on MBE-grown GaTexSe1-x/Si heterostructures across the full range to explore the composition-dependent external quantum efficiency. Our study opens a new avenue for the controllable growth of 2D alloys with wafer-scale homogeneity, which is a prominent challenge in 2D material research.
High Thermoelectric Performance in Sintered Octahedron-Shaped Sn(CdIn)xTe1+2x Microcrystals
Publisher: American Chemical Society (ACS)
Date: 18-10-2018
Abstract: In this study, we fabricate In/Cd codoped octahedron-shape Sn(CdIn)
Advances in Ag2S-based thermoelectrics for wearable electronics: progress and perspective
Publisher: Elsevier BV
Date: 10-2023
Dispersive localized Ta-rich area and Ta substitution approach ultralow lattice thermal conductivity in CrSi2
Publisher: Elsevier BV
Date: 03-2023
Significance of Partial Substitution of Carbon by Nitrogen on Strengthening and Toughening Mechanisms of High Nitrogen Fe-15Cr-1Mo-C-N Martensitic Stainless Steels
Publisher: Springer Science and Business Media LLC
Date: 19-08-2019
High-efficiency thermocells driven by thermo-electrochemical processes
Publisher: Elsevier BV
Date: 07-2021
Cu2Se thermoelectrics: property, methodology, and device
Publisher: Elsevier BV
Date: 12-2020
Low lattice thermal conductivity and enhanced thermoelectric performance of SnTe via chemical electroless plating of Ag
Publisher: Springer Science and Business Media LLC
Date: 16-08-2021
Rapid Synthesis of Sub-5 nm Sized Cubic Boron Nitride Nanocrystals with High-Piezoelectric Behavior via Electrochemical Shock
Publisher: American Chemical Society (ACS)
Date: 09-12-2016
DOI: 10.1021/ACS.NANOLETT.6B04272
Abstract: A key challenge in current superhard materials research is the design of novel superhard nanocrystals (NCs) whereby new and unexpected properties may be predicted. Cubic boron nitride (c-BN) is a superhard material which ranks next to diamond however, downsizing c-BN material below the 10 nm scale is rather challenging, and the interesting new properties of c-BN NCs remain unexplored and wide open. Herein we report an electrochemical shock method to prepare uniform c-BN NCs with a lateral size of only 3.4 ± 0.6 nm and a thickness of only 0.74 ± 0.3 nm at ambient temperature and pressure. The fabrication process is simple and fast, with c-BN NCs produced in just a few minutes. Most interestingly, the NCs exhibit excellent piezoelectric performance with a large recordable piezoelectric coefficient of 25.7 pC/N, which is almost 6 times larger than that from bulk c-BN and even competitive to conventional piezoelectric materials. The phenomenon of enhancement in the piezoelectric properties of BN NCs might arise from the nanoscale surface effect and nanoscale shape effect of BN NCs. This work paves an interesting route for exploring new properties of superhard NCs.
A novel bottom-up solvothermal synthesis of carbon nanosheets
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA13593D
Self-assembly and cathodoluminescence of microbelts from Cu-doped boron nitride nanotubes
Publisher: American Chemical Society (ACS)
Date: 29-07-2008
DOI: 10.1021/NN800211Z
The role of crystal phase in determining photocatalytic activity of nitrogen doped TiO2
Publisher: Elsevier BV
Date: 2009
DOI: 10.1016/J.JCIS.2008.09.061
Abstract: Two series of nitrogen doped TiO(2) s les with different ratios of anatase to rutile phases were prepared by milling the mixture of P25 TiO(2) and C(6)H(12)N(4) in air and gaseous NH(3) atmosphere, respectively. Compared to air, NH(3) atmosphere plays an important role in delaying the crystallite transformation from anatase to rutile in the mechanochemical reaction of TiO(2) and C(6)H(12)N(4). In contrast to the previously reported results for pure TiO(2), it is found that nitrogen doped TiO(2) with higher content of rutile phase demonstrates higher photocatalytic activity in photodegrading pollutant Rhodamine B under both UV light and visible light irradiation (lambda>420 nm), and the amount of the surface-adsorbed water and hydroxyl groups on nitrogen doped TiO(2) have little correlations with their crystallite phases (anatase or rutile) and photocatalytic activity. The more abundant surface states characterized by photoluminescence spectroscopy together with the lowered valence band maximum of rutile TiO(2) by nitrogen doping are considered as the key factors for the higher activity of nitrogen doped TiO(2) with higher content of rutile phase.
Outstanding thermoelectric properties of solvothermal-synthesized Sn1−3xInxAg2xTe micro-crystals through defect engineering and band tuning
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA11614A
Abstract: In eco-friendly SnTe thermoelectrics, In and Ag co-doping induces the synergistic effect of resonance energy levels and valence band convergence to enhance its electrical transport properties, while defects ameliorates its thermal transport.
High-performance in n-type PbTe-based thermoelectric materials achieved by synergistically dynamic doping and energy filtering
Publisher: Elsevier BV
Date: 2022
Insight into the liquid state of organo-lead halide perovskites and their new roles in dye-sensitized solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01105H
In-situ growth of high-performance (Ag, Sn) co-doped CoSb3 thermoelectric thin films
Publisher: Elsevier BV
Date: 11-2021
Ti0.89 Si0.11 O2 single crystals bound by high-index {201} facets showing enhanced visible-light photocatalytic hydrogen evolution
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CC38105F
Abstract: Silicon (Si) doped anatase titanium dioxide (Ti(0.89)Si(0.11)O(2)) single crystals bound by high-index {201} facets and high-energy {001} facets were synthesized by a facile method. It was found that the Si-doping can widely extend the optical absorption edge into the visible-light region and highly reactive facets can enhance their photocatalytic activity, as revealed by the combination of experimental and computational studies.
Rational Electronic and Structural Designs Advance BiCuSeO Thermoelectrics
Publisher: Wiley
Date: 10-04-2021
Abstract: In this work, a record high thermoelectric figure‐of‐merit ZT of 1.6 ± 0.2 at 873 K in p‐type polycrystalline Bi 0.94 Pb 0.06 CuSe 1.01 O 0.99 by a synergy of rational band manipulation and novel nanostructural design is reported. First‐principles density functional theory calculation results indicate that the density of state at the Fermi level that crosses the valence band can be significantly reduced and the measured optical bandgap can be enlarged from 0.70 to 0.74 eV by simply replacing 1% O with 1% Se, both indicating a potentially reduced carrier concentration and in turn, an improved carrier mobility and a boosted power factor up to 9.0 µW cm −1 K −2 . Meanwhile, comprehensive characterizations reveal that under Se‐rich condition, Cu 2 Se secondary microphases and significant lattice distortions triggered by Pb‐doping and Se‐substitution can be simultaneously achieved, contributing to a reduced lattice thermal conductivity of 0.4 W m −1 K −1 . Furthermore, a unique shear exfoliation technique enables an effective grain refinement with higher anisotropy of the polycrystalline pellet, leading to a further improved power factor up to 10.9 µW cm −1 K −2 and a further reduced lattice thermal conductivity of 0.30 W m −1 K −1 , which gives rise to record high ZT .
Facile synthesis and characterization of multifunctional cobalt-based nanocomposites for targeted chemo-photothermal synergistic cancer therapy
Publisher: Elsevier BV
Date: 12-2019
Developing Instruments to Measure Students’ Logical, Critical, and Creative Thinking Competences for Bung Hatta University Students
Publisher: Science Publishing Corporation
Date: 02-10-2018
DOI: 10.14419/IJET.V7I4.9.20633
Abstract: This study aims to develop assessment instruments to measure students’ competence to think logically, critically and creatively at Teacher Education Program of Elementary School of the Faculty of Teachers Training and Education, Bung Hatta University. The instrumentswere developed based on a self-developed questionnaire with Likert-scale (1-5 points). This research was R & D research using 3 stages with 3D model: defining, designing, developing and desiminating. The results of development at the expert validation stage showed some parts of the product that needed to be revised appropriately by the team of experts (design experts and materials). The products were said to be worthy by a team of experts, with an average of 9.2, then tested on a small group. Small group trial results also showed an average of 8.9 with a proper and effective classification to continue in large group trials. The large group trials also showed a valid and reliable instrument to use, with a relicompetences index of 0.86.Furthermore, the researcher measured the competence of 42 students of Elementary School-Teacher Education based on logical,critical, and creative thinking competence.The results of the analysis showed that the percentage of categories of logical, critical, and creative thinking abilities were at the moderate / sufficient level.The research results also showed that it was necessary to improve the competences to think logically, critically, and creatively. A learning model that can improve the competence of the student is recommended accordingly.
Structural Evolution of High-Performance Mn-Alloyed Thermoelectric Materials: A Case Study of SnTe
Publisher: Wiley
Date: 25-05-2021
Abstract: Mn alloying in thermoelectrics is a long‐standing strategy for enhancing their figure‐of‐merit through optimizing electronic transport properties by band convergence, valley perturbation, or spin‐orbital coupling. By contrast, mechanisms by which Mn contributes to suppressing thermal transports, namely thermal conductivity, is still ambiguous. A few precedent studies indicate that Mn introduces a series of hierarchical defects from the nano‐ to meso‐scale, leading to effective phonon scattering scoping a wide frequency spectrum. Due to insufficient insights at the atomic level, the theory remains as phenomenological and cannot be used to quantitatively predict the thermal conductivity of Mn‐alloyed thermoelectrics. Herein, by choosing the SnTe as a case study, aberration‐corrected transmission electron microscopy (TEM)/scanning transmission electron microscopy (STEM) to characterize the lattice complexity of Sn 1.02− x Mn x Te is employed. Mn as a “dynamic” dopant that plays an important role in SnTe with respect to different alloying levels or post treatments is revealed. The results indicate that Mn precipitates at x = 0.08 prior to reaching solubility (≈10 mol%), and then splits into Mn Sn substitution and γ‐MnTe hetero‐phases via mechanical alloying. Understanding such unique crystallography evolution, combined with a modified Debye‐Callaway model, is critical in explaining the decreased thermal conductivity of Sn 1.02− x Mn x Te with rational phonon scattering pathways, which should be applicable for other thermoelectric systems.
Nitrogen doping in ion-exchangeable layered tantalate towards visible-light induced water oxidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CC05440B
Computer-aided design of high-efficiency GeTe-based thermoelectric devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE01004A
Abstract: Enhanced thermoelectric performance by band convergence and superlattice precipitates combined with geometry optimization by computer-aided design produced a segmented thermoelectric device with a record-high conversion efficiency.
Growth and optical properties of stacked-pyramid zinc sulfide architectures
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CE05212H
Field Emission and Cathodoluminescence of ZnS Hexagonal Pyramids of Zinc Blende Structured Single Crystals
Publisher: Wiley
Date: 02-02-2009
Hierarchical structures of single-crystalline anatase TiO2 nanosheets dominated by {001} facets
Publisher: Wiley
Date: 12-01-2011
Ce‐filled Ni1.5Co2.5Sb12 Skutterudite Thin Films with Record‐High Figure of Merit And Device Performance
Publisher: Wiley
Date: 09-08-2023
Abstract: Realizing high thermoelectric performance in CoSb 3 skutterudite‐based thin films and their devices is historically challenging, especially due to the lack of high‐performing thin‐film‐based device working at medium‐to‐high temperatures. Here, a record‐high ZT of 1.1 is achieved at 683 K in an n‐type Ce 0.3 Ni 1.5 Co 2.5 Sb 12 thin film, fabricated from a self‐designed target via advanced pulsed laser deposition. Both experimental and computational results confirm that the Ce‐filling and metal‐featured nanoinclusions such as CeSb contribute to high electrical conductivity, while the Ni‐doping and significantly strengthen the energy filtering effect that occurs at the dense interfaces between the Ce 0.3 Ni 1.5 Co 2.5 Sb 12 matrix and the nanoinclusions which leads to a large Seebeck coefficient, giving rise to such a high ZT . In addition, a new‐type CoSb 3 thin‐film‐based device is successfully fabricated, which exhibits a high output power density of 8.25 mW cm −2 at a temperature difference of 140 K and a cold‐side temperature of 573 K, indicating the potential for application to medium‐to‐high‐temperature power generation scenarios.
Ag doping induced abnormal lattice thermal conductivity in Cu2Se
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC04129F
Abstract: Schematic diagram of Cu + /Ag + diffusion in the Se sublattice of Cu 2 Se, in which blocked diffusion of Ag + may subsequently block the diffusion of other Cu + and weaken the scattering of phonons.
Magnetotransport Properties of Cd3As2 Nanostructures
Publisher: American Chemical Society (ACS)
Date: 27-08-2015
Abstract: Three-dimensional (3D) topological Dirac semimetal has a linear energy dispersion in 3D momentum space, and it can be viewed as an analogue of graphene. Extensive efforts have been devoted to the understanding of bulk materials, but yet it remains a challenge to explore the intriguing physics in low-dimensional Dirac semimetals. Here, we report on the synthesis of Cd3As2 nanowires and nanobelts and a systematic investigation of their magnetotransport properties. Temperature-dependent ambipolar behavior is evidently demonstrated, suggesting the presence of finite-size of bandgap in nanowires. Cd3As2 nanobelts, however, exhibit metallic characteristics with a high carrier mobility exceeding 32,000 cm(2) V(-1) s(-1) and pronounced anomalous double-period Shubnikov-de Haas (SdH) oscillations. Unlike the bulk counterpart, the Cd3As2 nanobelts reveal the possibility of unusual change of the Fermi sphere owing to the suppression of the dimensionality. More importantly, their SdH oscillations can be effectively tuned by the gate voltage. The successful synthesis of Cd3As2 nanostructures and their rich physics open up exciting nanoelectronic applications of 3D Dirac semimetals.
Hierarchical meso/macro-porous TiO2/graphitic carbon nitride nanofibers with enhanced hydrogen evolution
Publisher: Elsevier BV
Date: 04-2021
Hierarchical Structuring to Break the Amorphous Limit of Lattice Thermal Conductivity in High-Performance SnTe-Based Thermoelectrics
Publisher: American Chemical Society (ACS)
Date: 15-07-2020
High-Performance PEDOT:PSS Flexible Thermoelectric Materials and Their Devices by Triple Post-Treatments
Publisher: American Chemical Society (ACS)
Date: 28-06-2019
Using Intrinsic Intracrystalline Tunnels for Near‐Infrared and Visible‐Light Selective Electrochromic Modulation
Publisher: Wiley
Date: 27-04-2017
n-Type Bi2Te3-xSex Nanoplates with Enhanced Thermoelectric Efficiency Driven by Wide-Frequency Phonon Scatterings and Synergistic Carrier Scatterings
Publisher: American Chemical Society (ACS)
Date: 11-04-2016
Abstract: Driven by the prospective applications of thermoelectric materials, massive efforts have been dedicated to enhancing the conversion efficiency. The latter is governed by the figure of merit (ZT), which is proportional to the power factor (S(2)σ) and inversely proportional to the thermal conductivity (κ). Here, we demonstrate the synthesis of high-quality ternary Bi2Te3-xSex nanoplates using a microwave-assisted surfactant-free solvothermal method. The obtained n-type Bi2Te2.7Se0.3 nanostructures exhibit a high ZT of 1.23 at 480 K measured from the corresponding sintered pellets, in which a remarkably low κ and a shift of peak S(2)σ to high temperature are observed. By detailed electron microscopy investigations, coupled with theoretical analysis on phonon transports, we propose that the achieved κ reduction is attributed to the strong wide-frequency phonon scatterings. The shifting of peak S(2)σ to high temperature is due to the weakened temperature dependent transport properties governed by the synergistic carrier scatterings and the suppressed bipolar effects by enlarging the band gap.
Enhanced Thermoelectric Performance of SnTe-Based Materials via Interface Engineering
Publisher: American Chemical Society (ACS)
Date: 14-10-2021
Kinetic condition driven phase and vacancy enhancing thermoelectric performance of low-cost and eco-friendly Cu2−xS
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC00819E
Abstract: Cu 2−x S pellets sintered from powders synthesized with different NaOH amounts have different phase compositions and average Cu vacancy levels. This has subsequently led to enhanced thermoelectric performance due to both enhanced hole concentration and reduced phase transition temperature.
High Curie Temperature Bi1.85Mn0.15Te3 Nanoplates
Publisher: American Chemical Society (ACS)
Date: 07-11-2012
DOI: 10.1021/JA308933K
Abstract: Bi(1.85)Mn(0.15)Te(3) hexagonal nanoplates with a width of ~200 nm and a thickness of ~20 nm were synthesized using a solvothermal method. According to the structural characterization and compositional analysis, the Mn(2+) and Mn(3+) ions were found to substitute Bi(3+) ions in the lattice. High-level Mn doping induces significant lattice distortion and decreases the crystal lattice by 1.07% in the a axis and 3.18% in the c axis. A high ferromagnetic state with a Curie temperature of ~45 K is observed in these nanoplates due to Mn(2+) and Mn(3+) ion doping, which is a significant progress in the field of electronics and spintronics.
Amorphous TiO2nanotube arrays for low-temperature oxygen sensors
Publisher: IOP Publishing
Date: 20-08-2008
DOI: 10.1088/0957-4484/19/40/405504
Abstract: Titania nanotube arrays (TNTA) were synthesized on a titanium substrate using anodic oxidation in an electrolyte containing ammonium fluoride and evaluated for low-temperature oxygen sensing. Their sensing properties were tested at different temperatures (50, 100, 150, 200, 250 and 300 °C) when exposed to various oxygen concentrations. The as-prepared TNTA are amorphous and exhibit much higher carrier concentration than that of annealed TNTA. Such amorphous TNTA show much higher sensitivity than that of annealed TNTA, SrTiO(3) and Ga(2)O(3) sensors. This s le demonstrates the lowest detectable oxygen concentration of 200 ppm, excellent recovery and good linear correlation at 100 °C. These results indicate that TNTA are indeed very attractive oxygen-sensing materials.
Anisotropy Control-Induced Unique Anisotropic Thermoelectric Performance in the n-Type Bi2Te2.7Se0.3 Thin Films
Publisher: Wiley
Date: 11-09-2019
Advances in conducting polymer-based thermoelectric materials and devices
Publisher: OAE Publishing Inc.
Date: 2021
Effects of Ausforming Procedure and Following Annealing Treatment on Microstructural Characteristics in Cobalt
Publisher: Springer Science and Business Media LLC
Date: 21-06-2017
Achieving ultrahigh power factor in n-type Ag2Se thin films by carrier engineering
Publisher: Elsevier BV
Date: 03-2022
Semiconducting properties of cup-stacked carbon nanotubes
Publisher: Elsevier BV
Date: 03-2009
Dual Ag/ZnO‐Decorated Micro‐/Nanoporous Sulfonated Polyetheretherketone with Superior Antibacterial Capability and Biocompatibility via Layer‐by‐Layer Self‐Assembly Strategy
Publisher: Wiley
Date: 21-05-2018
Abstract: Polyetheretherketone is attractive for dental and orthopedic applications due to its mechanical attributes close to that of human bone however, the lack of antibacterial capability and bioactivity of polyetheretherketone has substantially impeded its clinical applications. Here, a dual therapy implant coating is developed on the 3D micro-/nanoporous sulfonated polyetheretherketone via layer-by-layer self-assembly of Ag ions and Zn ions. Material characterization studies have indicated that nanoparticles consisting of elemental Ag and ZnO are uniformly incorporated on the porous sulfonated polyetheretherketone surface. The antibacterial assays demonstrate that Ag-decorated sulfonated polyetheretherketone and Ag/ZnO-codecorated sulfonated polyetheretherketone effectively inhibit the reproduction of Gram-negative and Gram-positive bacteria. Owing to the coordination of micro-/nanoscale topological cues and Zn induction, the Ag/ZnO-codecorated sulfonated polyetheretherketone substrates are found to enhance biocompatibility (cell viability, spreading, and proliferation), and hasten osteodifferentiation and -maturation (alkaline phosphate activity (ALP) production, and osteogenesis-related genetic expression), compared with the Ag-decorated sulfonated polyetheretherketone and the ZnO-decorated sulfonated polyetheretherketone counterparts. The dual therapy Ag/ZnO-codecorated sulfonated polyetheretherketone has an appealing bacteriostatic performance and osteogenic differentiation potential, showing great potential for dental and orthopedic implants.
Intercalation-Induced Disintegrated Layer-By-Layer Growth of Ultrathin Ternary Mo(Te1–xSx)2 Plates
Publisher: American Chemical Society (ACS)
Date: 27-12-0001
Fundamental and progress of Bi2Te3-based thermoelectric materials
Publisher: IOP Publishing
Date: 04-2018
Bioinspired Design of Strong, Tough, and Thermally Stable Polymeric Materials via Nanoconfinement
Publisher: American Chemical Society (ACS)
Date: 04-09-2018
Abstract: The combination of high strength, great toughness, and high heat resistance for polymeric materials is a vital factor for their practical applications. Unfortunately, until now it has remained a major challenge to achieve this performance portfolio because the mechanisms of strength and toughness are mutually exclusive. In the natural world, spider silk features the combination of high strength, great toughness, and excellent thermal stability, which are governed by the nanoconfinement of hydrogen-bonded β-sheets. Here, we report a facile bioinspired methodology for fabricating advanced polymer composite films with a high tensile strength of 152.8 MPa, a high stiffness of 4.35 GPa, and a tensile toughness of 30.3 MJ/m
Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide
Publisher: Wiley
Date: 12-11-2020
Abstract: Developing efficient and low‐cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The ersity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb‐like network, Ba 4 Sr 4 (Co 0.8 Fe 0.2 ) 4 O 15 (hex‐BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X‐ray absorption spectroscopy analysis and theoretical calculations. The bulk hex‐BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm −2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec −1 ) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.
Limit ofz T
Publisher: American Physical Society (APS)
Date: 14-10-2016
Achieving enhanced thermoelectric performance of Ca1-x-yLaxSryMnO3 via synergistic carrier concentration optimization and chemical bond engineering
Publisher: Elsevier BV
Date: 03-2021
Activation of Photocatalytic Water Oxidation on N-Doped ZnO Bundle-like Nanoparticles under Visible Light
Publisher: American Chemical Society (ACS)
Date: 03-2013
DOI: 10.1021/JP311729B
Novel B-site ordered double perovskite Ba2Bi0.1Sc0.2Co1.7O6−xfor highly efficient oxygen reduction reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0EE00451K
Two-dimensional WSe2/SnSe p-n junctions secure ultrahigh thermoelectric performance in n-type Pb/I Co-doped polycrystalline SnSe
Publisher: Elsevier BV
Date: 2021
SrNb0.1 Co0.7 Fe0.2 O3-δ perovskite as a next-generation electrocatalyst for oxygen evolution in alkaline solution
Publisher: Wiley
Date: 04-02-2015
Abstract: The perovskite SrNb0.1 Co0.7 Fe0.2 O3-δ (SNCF) is a promising OER electrocatalyst for the oxygen evolution reaction (OER), with remarkable activity and stability in alkaline solutions. This catalyst exhibits a higher intrinsic OER activity, a smaller Tafel slope and better stability than the state-of-the-art precious-metal IrO2 catalyst and the well-known BSCF perovskite. The mass activity and stability are further improved by ball milling. Several factors including the optimized eg orbital filling, good ionic and charge transfer abilities, as well as high OH(-) adsorption and O2 desorption capabilities possibly contribute to the excellent OER activity.
Bi2O3/BiVO4@graphene oxide van der Waals heterostructures with enhanced photocatalytic activity toward oxygen generation
Publisher: Elsevier BV
Date: 07-2021
Graphene‐Oxide‐Decorated Microporous Polyetheretherketone with Superior Antibacterial Capability and In Vitro Osteogenesis for Orthopedic Implant
Publisher: Wiley
Date: 02-05-2018
Abstract: Due to its similar elastic modulus of human bones, polyetheretherketone (PEEK) has been considered as an excellent cytocompatible material. However, the bioinertness, poor osteoconduction, and weak antibacterial activity of PEEK limit its wide applications in clinics. In this study, a facile strategy is developed to prepare graphene oxide (GO) modified sulfonated polyetheretherketone (SPEEK) (GO-SPEEK) through a simple dip-coating method. After detailed characterization, it is found that the GO closely deposits on the surface of PEEK, which is attributed to the π-π stacking interaction between PEEK and GO. Antibacterial tests reveal that the GO-SPEEK exhibits excellent suppression toward Escherichia coli. In vitro cell attachment, growth, differentiation, alkaline phosphatase activity, quantitative real-time polymerase chain reaction analyses, and calcium mineral deposition all illustrate that the GO-SPEEK substrate can significantly accelerate the proliferation and osteogenic differentiation of osteoblast-like MG-63 cells compared with those on PEEK and SPEEK groups. These results suggest that the GO-SPEEK has an improved antibacterial activity and cytocompatibility in vitro, showing that the developed GO-SPEEK has a great potential as the bioactive implant material in bone tissue engineering.
Zeeman splitting and dynamical mass generation in Dirac semimetal ZrTe5
Publisher: Springer Science and Business Media LLC
Date: 12-08-2016
DOI: 10.1038/NCOMMS12516
Abstract: Dirac semimetals have attracted extensive attentions in recent years. It has been theoretically suggested that many-body interactions may drive exotic phase transitions, spontaneously generating a Dirac mass for the nominally massless Dirac electrons. So far, signature of interaction-driven transition has been lacking. In this work, we report high-magnetic-field transport measurements of the Dirac semimetal candidate ZrTe 5 . Owing to the large g factor in ZrTe 5 , the Zeeman splitting can be observed at magnetic field as low as 3 T. Most prominently, high pulsed magnetic field up to 60 T drives the system into the ultra-quantum limit, where we observe abrupt changes in the magnetoresistance, indicating field-induced phase transitions. This is interpreted as an interaction-induced spontaneous mass generation of the Dirac fermions, which bears resemblance to the dynamical mass generation of nucleons in high-energy physics. Our work establishes Dirac semimetals as ideal platforms for investigating emerging correlation effects in topological matters.
Bioinspired, biocompatible and peptide-decorated silk fibroin coatings for enhanced osteogenesis of bioinert implant
Publisher: Informa UK Limited
Date: 23-05-2018
DOI: 10.1080/09205063.2018.1477316
Abstract: In this study, we develop an osteopromotive polyetheretherketone (PEEK) implant decorated with silk fibroin and bone forming peptide, in which the surface of bioinert PEEK implant is firstly sulfonated to form a three-dimensional, porous topography and then is functionalized with silk fibroin via spin-coating process and peptide decoration. The bio-test results show that cells on the functional bioinert implants exhibit better cell adhesion, proliferation and spreading, when compared with the uncoated ones. Moreover, the peptide-decorated silk fibroin coatings have ability to hasten the osteogenic differentiation and maturation of osteoblast-like cells. Our findings show the potential of the functional PEEK implants with superior bioactivity and osteoinductive property in orthopedics and dentistry. Besides, the facile, bioinspired, osteopromotive modification strategy can be used in other orthopedic and dental implants, such as titanium, zirconium dioxide.
In3Se4 and S-doped In3Se4 nano/micro-structures as new anode materials for Li-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA00688K
Abstract: In 3 Se 4 and S-doped In 3 Se 4 nano/micro-structures consisting of thin nanosheets have been explored as new anode materials for Li-ion batteries.
Synthesis and Photoelectrochemical Behavior of Nitrogen-doped NaTaO3
Publisher: The Chemical Society of Japan
Date: 05-03-2009
DOI: 10.1246/CL.2009.214
Scandium and phosphorus co-doped perovskite oxides as high-performance electrocatalysts for the oxygen reduction reaction in an alkaline solution
Publisher: Elsevier BV
Date: 02-2020
Exploring thermoelectric performance of Ca3Co4O9+δ ceramics via chemical electroless plating with Cu
Publisher: Elsevier BV
Date: 04-2020
Roles of Anion Sites in High-performance GeTe Thermoelectrics
Publisher: Research Square Platform LLC
Date: 21-01-2022
DOI: 10.21203/RS.3.RS-1237133/V1
Abstract: Cation doping has been mainly used to enhance the performance of rocksalt GeTe thermoelectric materials. However, its counterpart, anion doping, is still in infancy. Here, we provide a theoretical insight into modifying the anion sites of GeTe for obtaining a better thermoelectric performance, envisaging its coordinate-based bonding mechanisms accounting for carrier and phonon transport characteristics. To support our point, we experimentally synthesized anion I doped GeTe s les, which show comparably optimized electrical and thermal properties compared to Sb or Bi doped GeTe s les. The (Bi, I) co-doped GeTe s les further obtain an enhanced figure-of-merit from 0.8 to 2.5 at 675 K, which can be assembled as an 8-couple thermoelectric generator to yield a conversion efficiency of ~11.6% under a temperature difference of 500 K. This work rationalizes the potential of anion doping for high-performance GeTe thermoelectrics.
Rare-Earth Nd Inducing Record-High Thermoelectric Performance of (GeTe) 85 (AgSbTe 2 ) 15
Publisher: American Association for the Advancement of Science (AAAS)
Date: 2021
Abstract: As a promising midtemperature thermoelectric material with both higher thermoelectric performance and mechanical property, Tellurium Antimony Germanium Silver (TAGS- x ), written as (GeTe) x (AgSbTe 2 ) 1- x , especially (GeTe) 0.85 (AgSbTe 2 ) 0.15 (TAGS-85), has attracted wide attention. Herein, we innovatively use Nd doping to synergistically decrease the carrier concentration to the optimal level leading to enhanced dimensionless figure of merit, zT. Our density-functional theory calculation results indicate that Nd-doping reduced carrier concentration should be attributed to the enlargement of band gap. The optimized carrier concentration results in an ultrahigh power factor of ~32 μ W cm -1 K -2 at 727 K in Ge 0.74 Ag 0.13 Sb 0.11 Nd 0.02 Te. Simultaneously, the lattice thermal conductivity of Ge 0.74 Ag 0.13 Sb 0.11 Nd 0.02 Te retained as low as ~0.5 at 727 K. Ultimately, a record-high zT of 1.65 at 727 K is observed in the Ge 0.74 Ag 0.13 Sb 0.11 Nd 0.02 Te. This study indicates rare-earth Nd doping is effective in boosting the thermoelectric performance of TAGS-85 and approached a record-high level via synergistic effect.
Morphology and Texture Engineering Enhancing Thermoelectric Performance of Solvothermal Synthesized Ultralarge SnS Microcrystal
Publisher: American Chemical Society (ACS)
Date: 13-02-2020
Optimal array alignment to deliver high performance in flexible conducting polymer-based thermoelectric devices
Publisher: Elsevier BV
Date: 10-2022
Thermoelectric Generators: Alternative Power Supply for Wearable Electrocardiographic Systems
Publisher: Wiley
Date: 11-08-2020
Abstract: Research interest in the development of real‐time monitoring of personal health indicators using wearable electrocardiographic systems has intensified in recent years. New advanced thermoelectrics are potentially a key enabling technology that can be used to transform human body heat into power for use in wearable electrographic monitoring devices. This work provides a systematic review of the potential application of thermoelectric generators for use as power sources in wearable electrocardiographic monitoring systems. New strategies on miniaturized rigid thermoelectric modules combined with batteries or supercapacitors can provide adequate power supply for wearable electrocardiographic systems. Flexible thermoelectric generators can also support wearable electrocardiographic systems directly when a heat sink is incorporated into the design in order to enlarge and stabilize the temperature gradient. Recent advances in enhancing the performance of novel fiber/fabric based flexible thermoelectrics has opened up an exciting direction for the development of wearable electrocardiographic systems.
An ultra‐stable sodium half/full battery based on a unique micro‐channel pine‐derived carbon/SnS2@reduced graphene oxide film
Publisher: Wiley
Date: 06-01-2023
Abstract: Developing super stability, high coulomb efficiency, and long‐span life of sodium‐ion batteries (SIBs) can significantly widen their practical industrial applications. In this study, we report a pine‐derived carbon/SnS 2 @reduced graphene oxide (PDC/SnS 2 @rGO) film with fast ion/electron transport micro‐channel used as a SIB anode, which shows ultrahigh stable stability and long‐span life. Functionally, a biomass PDC/SnS 2 @rGO film with ~30 μm micro carbon channel and ~1.2 μm thick carbon wall can simultaneously provide the fast electron transport path and the Na + transport channel. Also, the two‐dimensional (2D) layered SnS 2 particles attached to the carbon wall of PDC can increase more Na + contact sites and shorten the Na + transport path in the NaPF 6 electrolyte. To avoid the separation of SnS 2 from PDC during the sodiation process, rGO with excellent conductivity and flexibility is wrapped in the SnS 2 outer layer as an “electronic garment”. A ~650 mA h g −1 high Na + storage capacity at 0.1 A g −1 and ~99.8% ultrahigh coulomb efficiency after 800 cycles at 5 A g −1 are obtained when PDC/SnS 2 @rGO film is used as a SIB anode. Furthermore, a SIB full‐cell is assembled using PDC/SnS 2 @rGO film (anode) and Na 3 V 2 (PO 4 ) 3 (cathode), which exhibits a ~163.9 mA h g −1 high reversible capacity and ~99.7% coulomb efficiency performance. Our work provides a reasonable design strategy for the application of biomass‐derived carbon in SIBs, which may inspire more biomass‐derived material studies.
Nitrogen-Doped Carbon Monolith for Alkaline Supercapacitors and Understanding Nitrogen-Induced Redox Transitions
Publisher: Wiley
Date: 14-03-2012
Abstract: A nitrogen-doped porous carbon monolith was synthesized as a pseudo-capacitive electrode for use in alkaline supercapacitors. Ammonia-assisted carbonization was used to dope the surface with nitrogen heteroatoms in a way that replaced carbon atoms but kept the oxygen content constant. Ammonia treatment expanded the micropore size-distributions and increased the specific surface area from 383 m(2) g(-1) to 679 m(2) g(-1). The nitrogen-containing porous carbon material showed a higher capacitance (246 F g(-1)) in comparison with the nitrogen-free one (186 F g(-1)). Ex situ electrochemical spectroscopy was used to investigate the evolution of the nitrogen-containing functional groups on the surface of the N-doped carbon electrodes in a three-electrode cell. In addition, first-principles calculations were explored regarding the electronic structures of different nitrogen groups to determine their relative redox potentials. We proposed possible redox reaction pathways based on the calculated redox affinity of different groups and surface analysis, which involved the reversible attachment/detachment of hydroxy groups between pyridone and pyridine. The oxidation of nitrogen atoms in pyridine was also suggested as a possible reaction pathway.
Nanostructured thermoelectric materials: Current research and future challenge
Publisher: Elsevier BV
Date: 12-2012
Arrays of Planar Vacancies in Superior Thermoelectric Ge 1− x − y Cd x Bi y Te with Band Convergence
Publisher: Wiley
Date: 19-09-2018
Crystal symmetry induced structure and bonding manipulation boosting thermoelectric performance of GeTe
Publisher: Elsevier BV
Date: 07-2020
Flexible thermoelectric materials and devices: From materials to applications
Publisher: Elsevier BV
Date: 06-2021
Enhanced photocatalytic hydrogen evolution by prolonging the lifetime of carriers in ZnO/CdS heterostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B904668B
Abstract: Coupled ZnO/CdS heterostructures based on the Z-scheme mechanism are demonstrated to be highly active photocatalysts for H(2) evolution under simulated solar light irradiation due to the greatly prolonged lifetime of photoexcited carriers.
Iodine doped anatase TiO2 photocatalyst with ultra-long visible light response: correlation between geometric/electronic structures and mechanisms
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B820816F
Bi0.5Sb1.5Te3/PEDOT:PSS-based flexible thermoelectric film and device
Publisher: Elsevier BV
Date: 10-2020
Realizing High Thermoelectric Performance in n-Type Highly Distorted Sb-Doped SnSe Microplates via Tuning High Electron Concentration and Inducing Intensive Crystal Defects
Publisher: Wiley
Date: 04-05-2021
Scalable Low‐Cost SnS2 Nanosheets as Counter Electrode Building Blocks for Dye‐Sensitized Solar Cells
Publisher: Wiley
Date: 12-06-2014
Abstract: A new type of semitransparent SnS2 nanosheet (NS) films were synthesized using a simple and environmentally friendly solution-processed approach, which were subsequently used as a counter electrode (CE) alternative to the noble metal Pt for triiodide reduction in dye-sensitized solar cells (DSSCs). The resultant SnS2 -based CE with a thickness of about 300 nm exhibited excellent electrochemical catalytic activity for catalyzing the reduction of triiodide and demonstrated comparable power conversion efficiency of 7.64 % with that of expensive Pt-based CE in DSSCs (7.71 %). When functionalized with a small amount of carbon nanoparticles, the SnS2 NS-based CE showed even better performance of 8.06 % than Pt under the same conditions. Considering the facile fabrication method, optical transparency, low cost, and remarkable catalytic property, this study on SnS2 NSs may shed light on the large-scale production of electrocatalytic electrode materials for low-cost photovoltaic devices.
A new crystal: layer-structured rhombohedral In3Se4
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CE41815D
Advances in Ionic Thermoelectrics: From Materials to Devices
Publisher: Wiley
Date: 20-01-2023
Abstract: As an extended member of the thermoelectric family, ionic thermoelectrics (i‐TEs) exhibit exceptional Seebeck coefficients and applicable power factors, and as a result have triggered intensive interest as a promising energy conversion technique to harvest and exploit low‐grade waste heat ( °C). The last decade has witnessed great progress in i‐TE materials and devices however, there are ongoing disputes about the inherent fundamentals and working mechanisms of i‐TEs, and a comprehensive overview of this field is required urgently. In this review, the prominent i‐TE effects, which set the ground for i‐TE materials, or more precisely, thermo‐electrochemical systems, are first elaborated. Then, TE performance, capacitance capability, and mechanical properties of such system‐based i‐TE materials, followed by a critical discussion on how to manipulate these factors toward a higher figure‐of‐merit, are examined. After that, the prevalent molding methods for assembling i‐TE materials into applicable devices are summarized. To conclude, several evaluation criteria for i‐TE devices are proposed to quantitatively illustrate the promise of practical applications. It is therefore clarified that, if the recent trend of developing i‐TEs can continue, the waste heat recycling landscape will be significantly altered.
Unique electronic structure induced high photoreactivity of sulfur-doped graphitic C3 N4
Publisher: American Chemical Society (ACS)
Date: 03-08-2010
DOI: 10.1021/JA103798K
Fast preparation of ultrafine monolayered transition-metal dichalcogenide quantum dots using electrochemical shock for explosive detection
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC06325J
Abstract: A simple, general and fast method called “electrochemical shock” is developed to prepare monolayered transition-metal dichalcogenide (TMD) QDs with an average size of 2–4 nm and an average thickness of 0.85 ± 0.5 nm with only about 10 min of ultrasonication.
Roles of Anion Sites in High‐Performance GeTe Thermoelectrics
Publisher: Wiley
Date: 22-09-2022
Abstract: Cationic doping is mainly used to improve the performance of rocksalt‐structured GeTe thermoelectric materials. However, its counterpart anionic doping is scarcely facilitated. Here, a comprehensive discussion is provided on doping at the anion site of rocksalt‐structured thermoelectric materials, surrounding its influence on bonding mechanisms, carrier and phonon transport characteristics, and thermoelectric figure‐of‐merit. To verify the viewpoint, a modified flux‐assist method is adopted to synthesize anionic Iodine (I) doped GeTe s les, which show comparably optimized electrical and thermal properties with that of cationic Antimony (Sb) or Bismuth (Bi) doped GeTe s les. Further combining cationic Bi and anionic I co‐doping, an enhanced figure‐of‐merit from 0.8 in pristine GeTe to 2.5 at 675 K can be realized in 8% (Bi and I) co‐doped GeTe, which corresponds to a maximum heat‐to‐electricity conversion efficiency of 14.6% under a temperature difference of 430 K. This study rationalizes the influence of anionic doping on the electrical and thermal properties of the rocksalt‐structured materials, which serves as an effective yet previously neglected strategy toward high‐performance GeTe thermoelectrics.
ZnS nanowires and their coaxial lateral nanowire heterostructures with BN
Publisher: AIP Publishing
Date: 05-03-2007
DOI: 10.1063/1.2711288
Abstract: ZnS nanowires and their coaxial lateral BN nanowire heterostructures with a length of hundreds of micrometers and an average diameter of ∼300nm were fabricated via one-step chemical vapor deposition method. Wurtzite ZnS nanowires were coated by a shell of fluffylike hexagonal BN sheets distributed randomly. Thermogravimetric analysis indicates that the heterostructures have a much better oxidation resistance compared with ZnS nanowires. Their similar optical property suggests that the ZnS∕BN heterostructures would have potential applications in thermally and chemically rigorous environments.
A new indium selenide phase: controllable synthesis, phase transformation and photoluminescence properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC04635F
Abstract: A new rhombohedral In 2.45 Se 4 phase has been controllably synthesized via a chemical solution method and reveals near-infrared photoluminescence emissions.
Thickness Dependence of Magnetic Behavior of LaAlO3 /SrTiO3 Heterostructures
Publisher: Wiley
Date: 09-05-2018
n-type Bi-doped PbTe Nanocubes with Enhanced Thermoelectric Performance
Publisher: Elsevier BV
Date: 2017
Hierarchical SnS2/carbon nanotube@reduced graphene oxide composite as an anode for ultra-stable sodium-ion batteries
Publisher: Elsevier BV
Date: 12-2020
Revealing cracking and breakage behaviours of gibbsite particles
Publisher: Elsevier BV
Date: 02-2021
High-Performance Thermoelectric Materials for Solar Energy Application
Publisher: Elsevier
Date: 2018
A flexible quasi-solid-state thermoelectrochemical cell with high stretchability as an energy-autonomous strain sensor
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1MH00775K
Abstract: A self-powered strain sensing system based on a quasi-solid-state thermoelectrochemical cell is developed via combining remarkable thermoelectrochemical performance with excellent mechanical flexibility/stretchability.
Structure and morphology of microporous carbon membrane materials derived from poly(phthalazinone ether sulfone ketone)
Publisher: Elsevier BV
Date: 11-2006
Facile synthesis of hierarchical Ni3Se2 nanodendrite arrays for supercapacitors
Publisher: Elsevier BV
Date: 10-2020
Double-walled carbon nanotubes synthesized using carbon black as the dot carbon source
Publisher: IOP Publishing
Date: 05-06-2006
Surface-energy engineered Bi-doped SnTe nanoribbons with weak antilocalization effect and linear magnetoresistance
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR07140F
Abstract: The rational design of semiconductor nanocrystals with well-defined surfaces is a crucial step towards the realization of next-generation photodetectors, and thermoelectric and spintronic devices. SnTe nanocrystals, as an ex le, are particularly attractive as a type of topological crystalline insulator, where surface facets determine their surface states. However, most of the available SnTe nanocrystals are dominated by thermodynamically stable {100} facets, and it is challenging to grow uniform nanocrystals with {111} facets. In this study, guided by surface-energy calculations, we employ a chemical vapour deposition approach to fabricate Bi doped SnTe nanostructures, in which their surface facets are tuned by Bi doping. The obtained Bi doped SnTe nanoribbons with distinct {111} surfaces show a weak antilocalization effect and linear magnetoresistance under high magnetic fields, which demonstrate their great potential for future spintronic applications.
Demonstration of a high performance 40-nm-gate carbon nanotube field-effect transistor
Publisher: IEEE
Date: 2005
Morphological control of SnTe nanostructures by tuning catalyst composition
Publisher: Springer Science and Business Media LLC
Date: 06-08-2015
Enhanced Thermoelectric Performance of Ultrathin Bi2Se3 Nanosheets through Thickness Control
Publisher: Wiley
Date: 20-04-2015
Thermo-Responsive Nanomaterials for Thermoelectric Generation
Publisher: Springer International Publishing
Date: 2020
Versatile Vanadium Doping Induces High Thermoelectric Performance in GeTe via Band Alignment and Structural Modulation
Publisher: Wiley
Date: 20-04-2021
Amino acid assisted synthesis of mesoporous TiO2 nanocrystals for high performance dye-sensitized solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM16762J
Arrayed van der Waals Vertical Heterostructures Based on 2D GaSe Grown by Molecular Beam Epitaxy
Publisher: American Chemical Society (ACS)
Date: 05-2015
DOI: 10.1021/ACS.NANOLETT.5B01058
Abstract: Vertically stacking two-dimensional (2D) materials can enable the design of novel electronic and optoelectronic devices and realize complex functionality. However, the fabrication of such artificial heterostructures on a wafer scale with an atomically sharp interface poses an unprecedented challenge. Here, we demonstrate a convenient and controllable approach for the production of wafer-scale 2D GaSe thin films by molecular beam epitaxy. In situ reflection high-energy electron diffraction oscillations and Raman spectroscopy reveal a layer-by-layer van der Waals epitaxial growth mode. Highly efficient photodetector arrays were fabricated, based on few-layer GaSe on Si. These photodiodes show steady rectifying characteristics and a high external quantum efficiency of 23.6%. The resultant photoresponse is super-fast and robust, with a response time of 60 μs. Importantly, the device shows no sign of degradation after 1 million cycles of operation. We also carried out numerical simulations to understand the underlying device working principles. Our study establishes a new approach to produce controllable, robust, and large-area 2D heterostructures and presents a crucial step for further practical applications.
Texture-dependent thermoelectric properties of nano-structured Bi2Te3
Publisher: Elsevier BV
Date: 05-2020
Related Organisations
Institute Of Metal Research Chinese Academy Of Sciences
Location: China
University Of Southern Queensland - Springfield Campus
Location: Australia
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