ORCID Profile
0000-0003-1932-6732
Current Organisations
University of Wollongong
,
Beihang University
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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)
Functional Materials | Materials Engineering | Catalysis and Mechanisms of Reactions | Nanoscale Characterisation | Nanomaterials | Physical Chemistry of Materials | Circuits and Systems | Energy Generation, Conversion and Storage Engineering | Compound Semiconductors | Nanotechnology | Metals and Alloy Materials | Condensed Matter Modelling and Density Functional Theory |
ANZSRC Socio-Economic Objective (SEO)
Hydrogen Production from Renewable Energy | Management of Greenhouse Gas Emissions from Energy Activities (excl. Electricity Generation) | Expanding Knowledge in Engineering | Energy Transformation not elsewhere classified | Environmentally Sustainable Energy Activities not elsewhere classified | Transformation of Gas into Liquid Fuels | Medical Instruments | Expanding Knowledge in the Physical Sciences | Scientific Instruments | Fabricated Metal Products not elsewhere classified | Expanding Knowledge in Technology
Related Links
Publications
The role of oxygen vacancies in the high cycling endurance and quantum conductance in BiVO4‐based resistive switching memory
Publisher: Wiley
Date: 17-01-2020
DOI: 10.1002/INF2.12085
Two dimensional bismuth-based layered materials for energy-related applications
Publisher: Elsevier BV
Date: 05-2019
Moiré-Potential-Induced Band Structure Engineering in Graphene and Silicene.
Publisher: Wiley
Date: 18-09-2021
Abstract: A moiré pattern results from the projection of one periodic pattern to another with relative lattice constant or misalignment and provides great periodic potential to modify the electronic properties of pristine materials. In this Review, recent research on the effect of the moiré superlattice on the electronic structures of graphene and silicene, both of which possess a honeycomb lattice, is focused on. The moiré periodic potential is introduced by the interlayer interaction to realize abundant phenomena, including new generation of Dirac cones, emergence of Van Hove singularities (vHs) at the cross point of two sets of Dirac cones, Mott-like insulating behavior at half-filling state, unconventional superconductivity, and electronic Kagome lattice and flat band with nontrivial edge state. The role of interlayer coupling strength, which is determined by twist angle and buckling degree, in these exotic properties is discussed in terms of both the theoretical prediction and experimental measurement, and finally, the challenges and outlook for this field are discussed.
Rational design of two-dimensional hybrid Co/N-doped carbon nanosheet arrays for efficient bi-functional electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9SE00176J
Abstract: The bi-functional electrocatalytic activity of CoNC- x /CC nanosheet arrays has been successfully tuned by regulating the valence states and particle size.
A non-enzymatic photoelectrochemical glucose sensor based on BiVO4 electrode under visible light
Publisher: Elsevier BV
Date: 07-2019
Enhancement of magnetization and dielectric properties of chromium-doped BiFeO3 with tunable morphologies
Publisher: Elsevier BV
Date: 10-2010
Comprehensive New Insights and Perspectives into Ti-Based Anodes for Next-Generation Alkaline Metal (Na+, K+) Ion Batteries
Publisher: Wiley
Date: 13-08-2018
Strong bioinspired HPA-rGO nanocomposite films via interfacial interactions for flexible supercapacitors
Publisher: Elsevier BV
Date: 04-2019
Formation mechanism of rhombohedral L11 phase in CoPt films grown on glass substrate
Publisher: Elsevier BV
Date: 02-2019
Optimization of photocarrier dynamics and activity in phosphorene with intrinsic defects for nitrogen fixation
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA08553G
Abstract: The typical point defects in phosphorene were exploited to activate its basal plane and optimally modulate the photocarrier dynamics for solar-driven nitrogen reduction reaction.
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
s-p orbital hybridization: a strategy for developing efficient photocatalysts with high carrier mobility
Publisher: Elsevier BV
Date: 04-2018
Boosting Light‐Driven Photocatalytic Water Splitting of Bi4NbO8Br by Polarization Field
Publisher: Wiley
Date: 03-07-2022
Abstract: Photocatalysis is regarded as a promising approach to solve the energy crisis by producing H 2 from water splitting reaction driven by solar light. However, low photogenerated charge carriers yielding and separating rates limit the quantum efficiency in photocatalytic reactions, which is a common drawback for most visible‐light photocatalysts. Herein, a bismuth‐based photocatalyst, Bi 4 NbO 8 Br, through intercalating NbO 6 octahedrons into layered BiOBr nanosheets, is designed and fabricated. Bi 4 NbO 8 Br demonstrates an enhanced photocatalytic water splitting ability as compared to BiOBr in visible light irradiation. The light absorption spectrum of Bi 4 NbO 8 Br is wider than that of BiOBr. It is found that such enhancements give rise to the ferroelectricity induced by the intercalated NbO 6 . The internal spontaneous polarization and an internal electric field formed in Bi 4 NbO 8 Br result in a significant band bending in its electronic structure and greatly promote the migration and separation of charge carriers in visible light irradiation.
Facet-dependent Electronic Quantum Diffusion in the High-Order Topological Insulator
Bi
Publisher:
American Physical Society (APS)
Date:
08-06-2022
Publisher: American Physical Society (APS)
Date: 08-06-2022
Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1−xFAxPbI3 quantum dot solar cells with reduced phase segregation
Publisher: Springer Science and Business Media LLC
Date: 20-01-2020
Interface Strain-Induced Multiferroicity in a SmFeO3 Film
Publisher: American Chemical Society (ACS)
Date: 08-05-2014
DOI: 10.1021/AM500762C
Abstract: An epitaxial pseudocubic SmFeO3 thin film on (100) Nb-SrTiO3 was studied based on ferroelectric (FE) characterization and magnetic measurements. High-resolution transmission electron microscopy images clarify the nature of the epitaxial growth, the stress-induced structural distortion at the film/substrate interface, and the existence of two different orientation lattices. Clear grain boundaries can be seen, which could introduce an extra local distortion. Rectangular FE loops can be observed at room temperature, even by just applying a small voltage ranging from -1 to +1 V, indicative of the presence of FE polarization. Piezoelectric force microscopy images confirm the existence of FE domains and the switchable polarization. A strong ferromagnetic-like transition occurs around 185 K, which is much lower than the transition observed in the bulk s le. It is believed that the pseudocubic structure enhances FE polarization and decreases the magnetic ordering temperature, which is confirmed by the first-principles theoretical calculations. Meanwhile, the ferroelectricity in this thin film should originate from distortion and modification in the structural modules rather than from the exchange striction interaction that is found in the bulk SmFeO3.
Near‐Infrared‐Driven Photocatalysts: Design, Construction, and Applications
Publisher: Wiley
Date: 20-09-2019
Abstract: Photocatalysts, which utilize solar energy to catalyze the oxidation or reduction half reactions, have attracted tremendous interest due to their great potential in addressing increasingly severe global energy and environmental issues. Solar energy utilization plays an important role in determining photocatalytic efficiencies. In the past few decades, many studies have been done to promote photocatalytic efficiencies via extending the absorption of solar energy into near-infrared (NIR) light. This Review comprehensively summarizes the recent progress in NIR-driven photocatalysts, including the strategies to harvest NIR photons and corresponding photocatalytic applications such as the degradation of organic pollutants, water disinfection, water splitting for H
Local probing of magnetoelectric properties of PVDF/Fe3O4electrospun nanofibers by piezoresponse force microscopy
Publisher: IOP Publishing
Date: 06-01-2017
Abstract: The coupling of magnetic and electric properties in polymer-based magnetoelectric composites offers new opportunities to develop contactless electrodes, effectively without electrical connections, for less-invasive integration into devices such as energy harvesters, sensors, wearable and implantable electrodes. Understanding the macroscale-to-nanoscale conversion of the properties is important, as nanostructured and nanoscale magnetoelectric structures are increasingly fabricated. However, whilst the magnetoelectric effect at the macroscale is well established both theoretically and experimentally, it remains unclear how this effect translates to the nanoscale, or vice versa. Here, PVDF/Fe
Ultra-thin Ga nanosheets: analogues of high pressure Ga(iii )
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR05597E
Abstract: Ultra-thin β-Ga(110) and high-pressure phase Ga( iii ) nanoislands were synthesized on Si(111).
Recent Progress on Germanene and Functionalized Germanene: Preparation, Characterizations, Applications, and Challenges
Publisher: Wiley
Date: 13-02-2019
Abstract: A new family of single-atom-thick 2D germanium-based materials with graphene-like atomic arrangement, germanene and functionalized germanene, has attracted intensive attention due to their large bandgap and easily tailored electronic properties. Unlike carbon atoms in graphene, germanium atoms tend to adopt mixed sp
Lanthanum doped multiferroic DyFeO3: Structural and magnetic properties
Publisher: AIP Publishing
Date: 05-2010
DOI: 10.1063/1.3360354
Abstract: Lanthanum doped multiferroic DyFeO3 was synthesized by solid state reaction. X-ray diffraction and refinement show that the lattice parameters of Dy1−xLaxFeO3 increase linearly with the La content. Raman spectroscopy reveals that the short-range force constant in Dy1−xLaxFeO3 is decreased by La3+ ion substitution. The spin reorientation phase transition temperature (TSRPT) is observed to decrease along with the doping level. The antiferromagnetic ordering temperature TN of Fe3+ ions is depressed with increasing doping level. Both decreasing TSRPT and decreasing TN indicate that Fe–Dy and Fe–Fe interactions are weakened by La substitution. It is found that the electron configuration of Fe3+ is high spin state and not affected by the La doping in all the s les above TN.
General Programmable Growth of Hybrid Core–Shell Nanostructures with Liquid Metal Nanodroplets
Publisher: Wiley
Date: 02-2021
Electronic structure and thermoelectric properties of Bi2Te3 crystals and graphene-doped Bi2Te3
Publisher: Elsevier BV
Date: 10-2010
Improving the Photo-Oxidative Performance of Bi2MoO6 by Harnessing the Synergy between Spatial Charge Separation and Rational Co-Catalyst Deposition
Publisher: American Chemical Society (ACS)
Date: 23-02-2018
Abstract: It has been reported that photogenerated electrons and holes can be directed toward specific crystal facets of a semiconductor particle, which is believed to arise from the differences in their surface electronic structures, suggesting that different facets can act as either photoreduction or photo-oxidation sites. This study examines the propensity for this effect to occur in faceted, plate-like bismuth molybdate (Bi
Topological Flat Bands in 2D Breathing‐Kagome Lattice Nb3TeCl7
Publisher: Wiley
Date: 03-09-2023
Abstract: Flat bands (FBs) can appear in two‐dimensional (2D) geometrically frustrated systems caused by quantum destructive interference (QDI). However, the scarcity of pure 2D frustrated crystal structures in natural materials makes FBs hard to be identified, let alone modulate FBs relating to electronic properties. Here, the experimental evidence of the complete electronic QDI induced FB contributed by the 2D breathing‐kagome layers of Nb atoms in Nb 3 TeCl 7 (NTC) is reported. An identical chemical state and 2D localization characteristics of the Nb breathing‐kagome layers are experimentally confirmed, based on which NTC is demonstrated to be a superior concrete candidate for the breathing‐kagome tight‐binding model. Furthermore, it theoretically establishes the tunable roles of the on‐site energy over Nb sites on bandwidth, energy position, and topology of FBs in NTC. This work opens an avenue to manipulate FBs characteristics in these 4 d transition‐metal‐based breathing‐kagome materials. This article is protected by copyright. All rights reserved
Emerging Advances of Liquid Metal toward Flexible Sensors
Publisher: Wiley
Date: 27-07-2023
Abstract: With the rising demand for biosignal detection, many wearable sensors emerge in recent years. Such a new generation of sensors relies on major breakthroughs in soft sensing materials, which can be bent, compressed, and stretched in a large range. Ga‐based liquid metals (LM) offer a unique combination of high deformability, electrical conductivity, and biocompatibility, making them ideal functional candidate materials for wearable sensors. Numerous studies design various LM sensors for detecting and modulating erse signals. Nevertheless, further systematic discussion is still missing regarding their operational mechanism, structure defects, and potential solutions. In this review, recent progress in the application of Ga‐based LM sensors is summarized and discussed, with a focus on the sensing principles corresponding to distinct LM properties, the problems, and solutions to each type of sensor. The key challenges toward biosignal detection and future research orientations are discussed.
Tunable Morphology and Magnetic Properties of Bi<SUB>2</SUB>Fe<SUB>4</SUB>O<SUB>9</SUB> Nanocrystal Synthesized by Hydrothermal Method
Publisher: American Scientific Publishers
Date: 03-2011
Abstract: Bi2Fe4O9 nano and micron powders have been synthesized by a hydrothermal method. The as-obtained s les are pure phase and crystallize in the orthorhombic structure. Diverse particle morphologies, including nanoplates, nanospheres, microcubes, and microcylinders, are obtained under different synthesis conditions. The solvent N,N-Dimethylformamide (DMF), together with the mineralisers NaOH and NH4OH, are found to be the key factors for the formation of the particles with their erse morphologies and sizes. The magnetization dependence of temperature (M-T), observed in a field of 1000 Oe from 10 to 340 K, and M-H loops measured at 10 K indicate that the Bi2Fe4O9 particles are paramagnetic at room temperature and undergo an antiferromagnetic transition at a Néel temperature (T(N)) of 250 K.
Highly nonlinear BiOBr nanoflakes for hybrid integrated photonics
Publisher: AIP Publishing
Date: 09-4200
DOI: 10.1063/1.5116621
Abstract: We investigate the nonlinear optical properties of BiOBr nanoflakes—a novel two-dimensional (2D) layered material from the bismuth oxyhalide family. We measure the nonlinear absorption and Kerr nonlinearity of BiOBr nanoflakes at both 800 nm and 1550 nm via the Z-Scan technique. We observe a large nonlinear absorption coefficient β ∼ 10−7 m/W as well as a large Kerr coefficient n2 ∼ 10−14 m2/W. We also observe strong dispersion in n2, with it reversing sign from negative to positive as the wavelength varies from 800 nm to 1550 nm. In addition, we characterize the thickness-dependence of the nonlinear optical properties of BiOBr nanoflakes, observing that both the magnitudes of β and n2 increase for very thin flakes. Finally, we integrate BiOBr nanoflakes onto silicon integrated waveguides and characterize the linear optical properties of the resulting hybrid integrated devices, with the measurements agreeing with calculated parameters using independent ellipsometry measurements. These results verify the strong potential of BiOBr as an advanced nonlinear optical material for high-performance hybrid integrated photonic devices.
Delocalized Surface State in Epitaxial Si(111) Film with Spontaneous √3 × √3 Superstructure
Publisher: Springer Science and Business Media LLC
Date: 28-08-2015
DOI: 10.1038/SREP13590
Abstract: The “multilayer silicene” films were grown on Ag(111), with increasing thickness above 30 monolayers (ML). Scanning tunneling microscopy (STM) observations suggest that the “multilayer silicene” is indeed a bulk-like Si(111) film with a (√3 × √3)R30° honeycomb superstructure on surface. The possibility for formation of Si(111)(√3 × √3)R30°-Ag reconstruction on the surface can be distinctively ruled out by peeling off the surface layer with the STM tip. On this surface, delocalized surface state as well as linear energy-momentum dispersion was observed from quasiparticle interference patterns. Our results indicate that a bulklike silicon film with diamondlike structure can also host delocalized surface state, which is even more attractive for potential applications, such as new generation of nanodevices based on Si.
Superconductivity and critical current density in LaFeAsO1−xFx compounds
Publisher: Elsevier BV
Date: 10-2010
Evidence for the dynamic relaxation behavior of oxygen vacancies in Aurivillius Bi2MoO6 from dielectric spectroscopy during resistance switching
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC02693B
Abstract: The resistive switching behavior of oxygen ion conductor Bi 2 MoO 6 were investigated by dielectric spectroscopy.
Germanene Nanosheets: Achieving Superior Sodium‐Ion Storage via Pseudointercalation Reactions
Publisher: Wiley
Date: 28-07-2021
Abstract: The potential of germanium‐based anodes for sodium‐ion batteries (NIBs) is seriously hindered by the high diffusion barrier of Na ions in the Ge lattice. Herein, a massive and defect‐rich 2D germanene nanosheet based anode is fabricated and exhibits enhanced Na‐storage performance for NIBs. Unlike the typical alloying/dealloying reactions of crystalline Ge, the germanene nanosheets are converted to go through a pseudointercalation mechanism during charge/discharge processes. Accordingly, the diffusion energy barriers of sodium atoms in the germanene nanosheets are significantly reduced, leading to high Na‐storage activity. Combined with its large surface area, high mechanical flexibility, fast electron mobility as well as its defect‐rich structure, the germanene anode delivers an initial capacity of 695 mAh g −1 , enhanced cycling performance, and outstanding rate capacities, compared with those of GeH nanosheets and Ge particles. It is believed that the germanene anode not only extends the scope of germanene application, but also provides new insights for adjusting Na‐storage pathways toward superior battery performance.
Superconductivity in Layered van der Waals Hydrogenated Germanene at High Pressure.
Publisher: American Chemical Society (ACS)
Date: 04-10-2022
DOI: 10.1021/JACS.2C05683
Abstract: The emergence of superconductivity in two-dimensional (2D) materials has attracted tremendous research efforts because the origins and mechanisms behind the unexpected and fascinating superconducting phenomena remain unclear. In particular, the superconductivity can survive in 2D systems even with weakened disorder and broken spatial inversion symmetry. Here, structural and superconducting transitions of 2D van der Waals (vdW) hydrogenated germanene (GeH) are observed under compression and decompression processes. GeH possesses a superconducting transition with a critical temperature (
Recent Progress on Two‐Dimensional Heterostructures for Catalytic, Optoelectronic, and Energy Applications
Publisher: Wiley
Date: 05-04-2019
The origin of enhanced photocatalytic activities of hydrogenated TiO2 nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7DT00827A
Abstract: The photocatalytic activity of semiconductors is largely governed by their light absorption, separation of photoinduced charge carriers and surface catalytically active sites, which are primarily controlled by the morphology, crystalline size, structure, and especially the electronic structure of photocatalysts.
Electric-Field-Driven Negative Differential Conductance in 2D van der Waals Ferromagnet Fe3GeTe2
Publisher: American Chemical Society (ACS)
Date: 28-10-2021
Thickness-independent scalable high-performance Li-S batteries with high areal sulfur loading via electron-enriched carbon framework
Publisher: Springer Science and Business Media LLC
Date: 26-07-2021
DOI: 10.1038/S41467-021-24873-4
Abstract: Increasing the energy density of lithium-sulfur batteries necessitates the maximization of their areal capacity, calling for thick electrodes with high sulfur loading and content. However, traditional thick electrodes often lead to sluggish ion transfer kinetics as well as decreased electronic conductivity and mechanical stability, leading to their thickness-dependent electrochemical performance. Here, free-standing and low-tortuosity N, O co-doped wood-like carbon frameworks decorated with carbon nanotubes forest (WLC-CNTs) are synthesized and used as host for enabling scalable high-performance Li-sulfur batteries. EIS-symmetric cell examinations demonstrate that the ionic resistance and charge-transfer resistance per unit electro-active surface area of S@WLC-CNTs do not change with the variation of thickness, allowing the thickness-independent electrochemical performance of Li-S batteries. With a thickness of up to 1200 µm and sulfur loading of 52.4 mg cm −2 , the electrode displays a capacity of 692 mAh g −1 after 100 cycles at 0.1 C with a low E/S ratio of 6. Moreover, the WLC-CNTs framework can also be used as a host for lithium to suppress dendrite growth. With these specific lithiophilic and sulfiphilic features, Li-S full cells were assembled and exhibited long cycling stability.
Domain wall conductivity in oxygen deficient multiferroic YMnO3 single crystals
Publisher: AIP Publishing
Date: 19-12-2011
DOI: 10.1063/1.3671393
Abstract: The transport properties of domain walls in oxygen deficient multiferroic YMnO3 single crystals have been probed using conductive atomic force microscopy and piezoresponse force microscopy. Domain walls exhibit significantly enhanced conductance after being poled in electric fields, possibly induced by oxygen vacancy ordering at domain walls. The electronic conduction can be understood by the Schottky emission and Fowler-Nordheim tunnelling mechanisms. Our results show that the domain wall conductance can be modulated through band structure engineering by manipulating ordered oxygen vacancies in the poling fields.
Highly efficient and selective electrocatalytic hydrogen peroxide production on Co-O-C active centers on graphene oxide
Publisher: Springer Science and Business Media LLC
Date: 28-03-2022
DOI: 10.1038/S42004-022-00645-Z
Abstract: Electrochemical oxygen reduction provides an eco-friendly synthetic route to hydrogen peroxide (H 2 O 2 ), a widely used green chemical. However, the kinetically sluggish and low-selectivity oxygen reduction reaction (ORR) is a key challenge to electrochemical production of H 2 O 2 for practical applications. Herein, we demonstrate that single cobalt atoms anchored on oxygen functionalized graphene oxide form Co-O-C@GO active centres (abbreviated as Co 1 @GO for simplicity) that act as an efficient and durable electrocatalyst for H 2 O 2 production. This Co 1 @GO electrocatalyst shows excellent electrochemical performance in O 2 -saturated 0.1 M KOH, exhibiting high reactivity with an onset potential of 0.91 V and H 2 O 2 production of 1.0 mg cm −2 h −1 while affording high selectivity of 81.4% for H 2 O 2 . Our combined experimental observations and theoretical calculations indicate that the high reactivity and selectivity of Co 1 @GO for H 2 O 2 electrogeneration arises from a synergistic effect between the O-bonded single Co atoms and adjacent oxygen functional groups (C-O bonds) of the GO present in the Co-O-C active centres.
Role of Charge Density Wave in Monatomic Assembly in Transition Metal Dichalcogenides
Publisher: Wiley
Date: 20-02-2019
The magnetic structure of an epitaxial BiMn0.5Fe0.5O3 thin film on SrTiO3 (001) studied with neutron diffraction
Publisher: AIP Publishing
Date: 22-10-2012
DOI: 10.1063/1.4762818
Abstract: High-angle neutron diffraction was used to directly reveal the atomic-scale magnetic structure of a single-crystalline BiMn0.5Fe0.5O3 thin film deposited on a SrTiO3 (001) substrate. The BiMn0.5Fe0.5O3 phase exhibits distinctive magnetic properties that differentiate it from both parent compounds: BiFeO3 and BiMnO3. A transition to long-range G-type antiferromagnetism was observed below 120 K with a (121212) propagation vector. A weak ferromagnetic behavior was measured at low temperature by superconducting quantum interference device (SQUID) magnetometry. There is no indication of the spin cycloid, known for BiFeO3, in the BiMn0.5Fe0.5O3 thin film. The neutron diffraction suggests a random distribution of Mn and Fe over perovskite B sites.
Monolayer Epitaxial Heterostructures for Selective Visible‐Light‐Driven Photocatalytic NO Oxidation
Publisher: Wiley
Date: 18-01-2019
Magnetostrictive properties of directional solidification Fe82Ga9Al9 alloy
Publisher: AIP Publishing
Date: 17-02-2012
DOI: 10.1063/1.3679152
Abstract: Fe82Ga9Al9 alloy rod was prepared by the directional solidification (DS) method. The effects of uniaxial compressive stress on magnetostriction of the alloy and the temperature dependence of magnetostriction were investigated. The results show that the magnetostriction increases from 135 × 10−6 at 2.3 MPa to 221 × 10−6 at 53 MPa and then remains at this value between 53 MPa and 90 MPa. This enhancement results from domain rotation under the compressive stress. The temperature dependence results show that the saturated magnetostriction decreases by 11% (25 °C–120 °C) and 13% (25 °C–100 °C) for s les with 0 MPa and 15 MPa compressive stress applied, respectively. This decrease is due to reduced magnetic crystalline anisotropy as the temperature increases. Under the compressive stress conditions, the magnetostriction decreases more notably.
Three-dimensional controlled growth of monodisperse sub-50 nm heterogeneous nanocrystals
Publisher: Springer Science and Business Media LLC
Date: 08-01-2016
DOI: 10.1038/NCOMMS10254
Abstract: The ultimate frontier in nanomaterials engineering is to realize their composition control with atomic scale precision to enable fabrication of nanoparticles with desirable size, shape and surface properties. Such control becomes even more useful when growing hybrid nanocrystals designed to integrate multiple functionalities. Here we report achieving such degree of control in a family of rare-earth-doped nanomaterials. We experimentally verify the co-existence and different roles of oleate anions (OA − ) and molecules (OAH) in the crystal formation. We identify that the control over the ratio of OA − to OAH can be used to directionally inhibit, promote or etch the crystallographic facets of the nanoparticles. This control enables selective grafting of shells with complex morphologies grown over nanocrystal cores, thus allowing the fabrication of a erse library of monodisperse sub-50 nm nanoparticles. With such programmable additive and subtractive engineering a variety of three-dimensional shapes can be implemented using a bottom–up scalable approach.
Ultra‐Tough Inverse Artificial Nacre Based on Epoxy‐Graphene by Freeze‐Casting
Publisher: Wiley
Date: 15-04-2019
Abstract: Epoxy nanocomposites combining high toughness with advantageous functional properties are needed in many fields. However, fabricating high-performance homogeneous epoxy nanocomposites with traditional methods remains a great challenge. Nacre with outstanding fracture toughness presents an ideal blueprint for the development of future epoxy nanocomposites. Now, high-performance epoxy-graphene layered nanocomposites were demonstrated with ultrahigh toughness and temperature-sensing properties. These nanocomposites are composed of ca. 99 wt % organic epoxy, which is in contrast to the composition of natural nacre (ca. 96 wt % inorganic aragonite). These nanocomposites are named an inverse artificial nacre. The fracture toughness reaches about 4.2 times higher than that of pure epoxy. The electrical resistance is temperature-sensitive and stable under various humidity conditions. This strategy opens an avenue for fabricating high-performance epoxy nanocomposites with functional properties.
Bio-Inducing Growth of ZnO Hollow Spheres in Lotus Root
Publisher: American Scientific Publishers
Date: 11-2010
Abstract: In this paper, ZnO hollow spheres are prepared via an antitoxic bio-inducing process in lotus roots. FESEM images indicate that the tannin cells coated with ZnO are spherical with diameters ranging from 1.5 microm to 3 microm. The spheres with approximately the same size aggregate on the surface of vessels in short-range. The new bio-inducing process for formation of oxides hollow spheres might exist for long time in nature. It is proved that plant antitoxic function is the key factor to induce these structures formation. And moreover, it could be predicted that this bio-inducing phenomenon is an ideal way for preparation of materials with special structures.
A way to enhance the magnetic moment of multiferroic bismuth ferrite
Publisher: IOP Publishing
Date: 03-06-2010
DOI: 10.1088/0022-3727/43/24/242001
Abstract: Transition metals, including Co, Cr, Ni and Mn, were doped into multiferroic Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 s les that were fabricated by a solid state reaction. X-ray diffraction results show that only the Mn-doped s le did not contain any impurity phases, while the other transition metal dopants destroyed the phase stability of the pure Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 phase and caused the formation of second phases. All the transition metal doped Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 s les show significant enhancement in their magnetic moment at room temperature in comparison with the BiFeO 3 and Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 s les without transition metal doping. This is explained by the formation of local ferrimagnetic ordering or ferromagnetic ordering in the transition metal doped Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 , according to the electron configurations of the dopant transition metal ions.
Epitaxial Growth of Quasi-One-Dimensional Bismuth-Halide Chains with Atomically Sharp Topological Non-Trivial Edge States
Publisher: American Chemical Society (ACS)
Date: 16-08-2021
Ultratough nacre-inspired epoxy–graphene composites with shape memory properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA10725D
Abstract: Nacre-inspired epoxy–graphene composites with unique fracture toughness and thermo or electro-active shape memory properties are engineered via freeze-casting.
Au-nanoparticle-supported ZnO as highly efficient photocatalyst for H2O2 production
Publisher: Elsevier BV
Date: 2020
Gallium-Indium-Tin Liquid Metal Nanodroplet-Based Anisotropic Conductive Adhesives for Flexible Integrated Electronics
Publisher: American Chemical Society (ACS)
Date: 06-01-2021
Fabrication and Magneto-Transport Properties of p-type Bi0.5Sb1.5Te3 Thin Films on Glass by Pulsed Laser Deposition
Publisher: American Scientific Publishers
Date: 06-2012
New monatomic layer clusters for advanced catalysis materials
Publisher: Springer Science and Business Media LLC
Date: 10-07-2018
Investigating the effect of UV light pre-treatment on the oxygen activation capacity of Au/TiO2
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CY01717G
Abstract: UV light pre-illumination-enhanced catalytic O 2 activation by Au/TiO 2 . Carbon hydrogen oxygen electron charge traps Au Au perimeter atom.
Recent progress on liquid metals and their applications
Publisher: Informa UK Limited
Date: 2018
Quasi-freestanding epitaxial silicene on Ag(111) by oxygen intercalation
Publisher: American Association for the Advancement of Science (AAAS)
Date: 07-2016
Abstract: Quasi-freestanding silicene with massless Dirac fermion characteristics has been successfully obtained by oxygen intercalation.
A Liquid-Metal-Based Magnetoactive Slurry for Stimuli-Responsive Mechanically Adaptive Electrodes
Publisher: Wiley
Date: 17-07-2018
Abstract: Electrical communication between a biological system and outside equipment allows one to monitor and influence the state of the tissue and nervous networks. As the bridge, bioelectrodes should possess both electrical conductivity and adaptive mechanical properties matching the target soft biosystem, but this is still a big challenge. A family of liquid-metal-based magnetoactive slurries (LMMSs) formed by dispersing magnetic iron particles in a Ga-based liquid metal (LM) matrix is reported here. The mechanical properties, viscosity, and stiffness of such materials rapidly respond to the stimulus of an applied magnetic field. By varying the intensity of the magnetic field, regulation within a factor of 1000 of the Young's modulus from ≈kPa to ≈MPa, and the ability to reach GPa with more dense iron particles inside the LMMS are demonstrated. With the advantage of high conductivity of the LM matrix, the functions of the LMMS are not only limited to the soft implanted electrodes or penetrating electrodes in biosystems: the electrical response based on the LMMS electrodes can also be precisely tuned by simply regulating the applied magnetic field.
Control of Photocarrier Separation and Recombination at Bismuth Oxyhalide Interface for Nitrogen Fixation
Publisher: American Chemical Society (ACS)
Date: 21-10-2020
Amorphous MoO3−x nanosheets prepared by the reduction of crystalline MoO3 by Mo metal for LSPR and photothermal conversion
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC06704C
Abstract: Amorphous MoO 3−x nanosheets with enhanced LSPR are fabricated by introducing Mo atoms into the interlayers of MoO 3 via a hydrothermal and post-irradiation method, which is beneficial for photo-to-heat conversion.
Reversible Potassium Intercalation in Blue Phosphorene–Au Network Driven by an Electric Field
Publisher: American Chemical Society (ACS)
Date: 25-06-2020
Role of surface wettability in photoelectrocatalytic oxygen evolution reactions
Publisher: Elsevier BV
Date: 04-2022
Observation of van Hove Singularities in Twisted Silicene Multilayers
Publisher: American Chemical Society (ACS)
Date: 26-07-2016
Magnetic properties of Bi2FeMnO6: A multiferroic material with double-perovskite structure
Publisher: AIP Publishing
Date: 20-09-2010
DOI: 10.1063/1.3490221
Abstract: Single phase Bi2FeMnO6 was synthesized on Si substrates by an electrospray method. Three peaks were observed in the temperature dependence of magnetization curve, which is attributed to the inhomogeneous distribution of Fe3+ and Mn3+. The observed magnetic peaks at 150 K, 260 K, and 440 K correspond to orderings of the ferrimagnetic Fe–O–Mn, and antiferromagnetic Mn–O–Mn and Fe–O–Fe, respectively. Heat capacity measurements were carried out to confirm these magnetic transitions. The Debye temperature of Bi2FeMnO6 is 339 K, calculated from Debye–Einstein fitting.
Liquid metals and their hybrids as stimulus–responsive smart materials
Publisher: Elsevier BV
Date: 04-2020
Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA09897A
Abstract: Engineering the electronic structure of BiOCl through the creation of oxygen vacancies can be a good strategy to enhance the photooxidation activity of BiOCl.
Reversible Oxidation of Blue Phosphorus Monolayer on Au(111)
Publisher: American Chemical Society (ACS)
Date: 05-07-2019
DOI: 10.1021/ACS.NANOLETT.9B01796
Abstract: Practical applications of two-dimensional (2D) black phosphorus (BP) are limited by its fast degradation under ambient conditions, for which many different mechanisms have been proposed however, an atomic level understanding of the degradation process is still hindered by the absence of bottom-up methods for the growth of large-scale few-layer black phosphorus. Recent experimental success in the fabrication of single-layer blue phosphorus provides a model system to probe the oxidation mechanism of two-dimensional (2D) phosphorene down to single-layer thicknesses. Here, we report an atomic-scale investigation of the interaction between molecular oxygen and blue phosphorus. The atomic structure of blue phosphorus and the local binding sites of oxygen have been precisely identified using qPlus-based noncontact atomic force microscopy. A combination of low-temperature scanning tunneling microscopy and X-ray photoelectron spectroscopy measurements reveal a thermally reversible oxidation process of blue phosphorus in a pure oxygen atmosphere. Our study clearly demonstrates the essential role of oxygen in the initial oxidation process, and it sheds further light on the fundamental pathways of the degradation mechanism.
Enhanced magnetic moment in ErMnO3 by copper doping and negative magnetocapacitance effect
Publisher: IOP Publishing
Date: 29-07-2010
DOI: 10.1088/0022-3727/43/32/325002
Abstract: Single phase ErCu x Mn 1− x O 3 (0 ⩽ x ⩽ 0.1) compounds were prepared by the standard solid-state reaction. The doping effects on the crystal structure, magnetic properties and dielectric properties were systematically studied. X-ray diffraction patterns show that all s les are single phase and crystallized in a hexagonal structure belonging to the P 6 3 cm space group. Rietveld refinement indicates that the a lattice parameter increases and the c lattice parameter decreases with increasing Cu concentration. The magnetic moments of the doped s les are enhanced, which is due to modification of the frustrated spin arrangement by the superexchange interaction between Cu 2+ ions and Mn 3+ ions. The specific heat capacity data show a peak at the antiferromagnetic transition temperature, which decreases from 77 K for x = 0 to 61 K for x = 0.1. The s les become more conductive upon doping, which is responsible for the increase in the dielectric constant. A large negative magnetocapacitance effect was observed in paramagnetic-state ErCu 0.05 Mn 0.95 O 3 at 300 K.
Depth-profiling of Yb3+ sensitizer ions in NaYF4 upconversion nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR01456B
Abstract: Enhancing the efficiency of upconversion nanoparticles (UCNPs) and therefore their brightness is the critical goal for this emerging material to meet growing demands in many potential applications including sensing, imaging, solar energy conversion and photonics. The distribution of the photon sensitizer and activator ions that form a network of energy transfer systems within each single UCNP is vital for understanding and optimizing their optical properties. Here we employ synchrotron-based X-ray Photoelectron Spectroscopy (XPS) to characterize the depth distribution of Yb
A 2D metal-organic framework/Ni(OH)(2) heterostructure for an enhanced oxygen evolution reaction Electronic supplementary information (ESI) available. See DOI: 10.1039/c8nr09680e
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR09680E
Abstract: Ni-BDC/Ni(OH) 2 hybrid nanosheets were fabricated and explored as a highly efficient electrocatalyst for the oxygen evolution reaction.
Indirect-Direct Band Transformation of Few-Layer BiOCl under Biaxial Strain
Publisher: American Chemical Society (ACS)
Date: 20-04-2016
Point defects in epitaxial silicene on Ag(111) surfaces
Publisher: IOP Publishing
Date: 23-06-2016
A Gallium-Based Magnetocaloric Liquid Metal Ferrofluid.
Publisher: American Chemical Society (ACS)
Date: 07-11-2017
DOI: 10.1021/ACS.NANOLETT.7B04050
Abstract: We demonstrate a magnetocaloric ferrofluid based on a gadolinium saturated liquid metal matrix, using a gallium-based liquid metal alloy as the solvent and suspension medium. The material is liquid at room temperature, while exhibiting spontaneous magnetization and a large magnetocaloric effect. The magnetic properties were attributed to the formation of gadolinium nanoparticles suspended within the liquid gallium alloy, which acts as a reaction solvent during the nanoparticle synthesis. High nanoparticle weight fractions exceeding 2% could be suspended within the liquid metal matrix. The liquid metal ferrofluid shows promise for magnetocaloric cooling due to its high thermal conductivity and its liquid nature. Magnetic and thermoanalytic characterizations reveal that the developed material remains liquid within the temperature window required for domestic refrigeration purposes, which enables future fluidic magnetocaloric devices. Additionally, the observed formation of nanometer-sized metallic particles within the supersaturated liquid metal solution has general implications for chemical synthesis and provides a new synthetic pathway toward metallic nanoparticles based on highly reactive rare earth metals.
Construction of a Bi2MoO6:Bi2Mo3O12 heterojunction for efficient photocatalytic oxygen evolution
Publisher: Elsevier BV
Date: 12-2018
Iron Doped Hexagonal ErMnO3: Structural, Magnetic, and Dielectric Properties
Publisher: American Scientific Publishers
Date: 02-2012
Abstract: The single phase ErFe(x)Mn1-xO3 (0 < or = x < or = 0.15) compounds were synthesized by the solid-state reaction method. The doping effects on the crystal structural, magnetic, thermal, and dielectric properties were systematically investigated. The XRD patterns show all s les crystallize in the hexagonal structure with P6(3)cm space group. The lattice parameters a and c first decrease with doping, which is followed by a subsequent increase at higher doping levels. Although both the Fe3+ and Mn3+ ions remain stable in high spin trivalent states in all s les, the magnetization is weakened with increasing Fe contents. The heat capacity data shows the antiferromagnetic transition slightly shifts from 77 K for ErMnO3 to 80 K for ErFe015Mn0.85O3, which can not be observed in the magnetic susceptibility data. The real part of complex impedance of these s les rises as the doping level increases, indicating the enhancement of insulativity of doped s les.
Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets
Publisher: American Chemical Society (ACS)
Date: 09-12-2015
Abstract: BiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a facile hydrothermal method. The inner strain in the BiOBr nanosheets has been tuned continuously by the pH value. The photocatalytic performance of BiOBr in dye degradation can be manipulated by the strain effect. The low-strain BiOBr nanosheets show improved photocatalytic activity. Density functional calculations suggest that strain can modify the band structure and symmetry in BiOBr. The enhanced photocatalytic activity in low-strain BiOBr nanosheets is due to improved charge separation attributable to a highly dispersive band structure with an indirect band gap.
Improving the photo-oxidative capability of BiOBr via crystal facet engineering
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA10964K
Abstract: An increased presence of the {010} facet improved the performance of BiOBr for both water photooxidation and formic acid photodegradation.
Recent Development of Zeolitic Imidazolate Frameworks (ZIFs) Derived Porous Carbon Based Materials as Electrocatalysts
Publisher: Wiley
Date: 10-07-2018
Growth Mechanism and Magnetic Properties of Highly Crystalline NiO Nanocubes and Nanorods Fabricated by Evaporation
Publisher: American Chemical Society (ACS)
Date: 15-05-2012
DOI: 10.1021/CG201676U
Promoting photoreduction properties via synergetic utilization between plasmonic effect and highly active facet of BiOCl
Publisher: Elsevier BV
Date: 03-2019
Laser‐Generated Supranano Liquid Metal as Efficient Electron Mediator in Hybrid Perovskite Solar Cells
Publisher: Wiley
Date: 09-07-2020
A ferroelectric photocatalyst Ag10 Si4 O13 with visible-light photooxidation properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA03578G
Abstract: A new ferroelectric p-block photocatalyst, Ag 10 Si 4 O 13 , has been successfully prepared here and exhibited excellent visible-light-driven photocatalytic activity towards the degradation of organic compounds.
Binary Pd/amorphous-SrRuO3 hybrid film for high stability and fast activity recovery ethanol oxidation electrocatalysis
Publisher: Elsevier BV
Date: 2020
Fabrication and characterization of textured Bi2Te3 thermoelectric thin films prepared on glass substrates at room temperature using pulsed laser deposition
Publisher: Elsevier BV
Date: 2013
High-strength scalable MXene films through bridging-induced densification
Publisher: American Association for the Advancement of Science (AAAS)
Date: 10-2021
Abstract: MXenes are a family of layered two-dimensional metal carbides and nitrides with interesting properties that can be lost if voids are formed during synthesis. By using a sequential combination of hydrogen and covalent bonding agents, Wan et al . were able to densify the layered structure and remove voids. This procedure leads to improvements in the mechanical strength and toughness, electrical conductivity, and shielding from electromagnetic interference. —MSL
Room Temperature Giant and Linear Magnetoresistance in Topological InsulatorBi 2
Publisher:
American Physical Society (APS)
Date:
29-06-2012
Publisher: American Physical Society (APS)
Date: 29-06-2012
Pb thin films on Si(111): Local density of states and defects
Publisher: IEEE
Date: 02-2014
Epitaxial growth of an atom-thin layer on a LiNi0.5Mn1.5O4 cathode for stable Li-ion battery cycling
Publisher: Springer Science and Business Media LLC
Date: 23-03-2022
DOI: 10.1038/S41467-022-28963-9
Abstract: Transition metal dissolution in cathode active material for Li-based batteries is a critical aspect that limits the cycle life of these devices. Although several approaches have been proposed to tackle this issue, this detrimental process is not yet overcome. Here, benefitting from the knowledge developed in the semiconductor research field, we apply an epitaxial method to construct an atomic wetting layer of LaTMO 3 (TM = Ni, Mn) on a LiNi 0.5 Mn 1.5 O 4 cathode material. Experimental measurements and theoretical analyses confirm a Stranski–Krastanov growth, where the strained wetting layer forms under thermodynamic equilibrium, and it is self-limited to monoatomic thickness due to the competition between the surface energy and the elastic energy. Being atomically thin and crystallographically connected to the spinel host lattices, the LaTMO 3 wetting layer offers long-term suppression of the transition metal dissolution from the cathode without impacting its dynamics. As a result, the epitaxially-engineered cathode material enables improved cycling stability (a capacity retention of about 77% after 1000 cycles at 290 mA g −1 ) when tested in combination with a graphitic carbon anode and a LiPF 6 -based non-aqueous electrolyte solution.
Efficient Photocatalytic Hydrogen Peroxide Production over TiO2 Passivated by SnO2
Publisher: MDPI AG
Date: 21-07-2019
DOI: 10.3390/CATAL9070623
Abstract: Photocatalysis provides an attractive strategy for synthesizing H2O2 at ambient condition. However, the photocatalytic synthesis of H2O2 is still limited due to the inefficiency of photocatalysts and decomposition of H2O2 during formation. Here, we report SnO2-TiO2 heterojunction photocatalysts for synthesizing H2O2 directly in aqueous solution. The SnO2 passivation suppresses the complexation and decomposition of H2O2 on TiO2. In addition, loading of Au cocatalyst on SnO2-TiO2 heterojunction further improves the production of H2O2. The in situ electron spin resonance study revealed that the formation of H2O2 is a stepwise single electron oxygen reduction reaction (ORR) for Au and SnO2 modified TiO2 photocatalysts. We demonstrate that it is feasible to enhance H2O2 formation and suppress H2O2 decomposition by surface passivation of the H2O2-decomposition-sensitive photocatalysts.
Morphology engineering of atomic layer defect-rich CoSe2nanosheets for highly selective electrosynthesis of hydrogen peroxide
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05731F
Abstract: Self-grown ultra-thin and defect-rich CoSe 2 nanosheets show up to 92% selectivity in electrosynthesis of hydrogen peroxide, with ideal yields in electrolytes with different pH.
Advances in bismuth-based topological quantum materials by scanning tunneling microscopy
Publisher: IOP Publishing
Date: 09-2022
Abstract: In recent years, topological quantum materials (TQMs) have attracted intensive attention in the area of condensed matter physics due to their novel topologies and their promising applications in quantum computing, spin electronics and next-generation integrated circuits. Scanning tunneling microscopy/spectroscopy (STM/STS) is regarded as a powerful technique to characterize the local density of states with atomic resolution, which is ideally suited to the measurement of the bulk-boundary correspondence of TQMs. In this review, using STM/STS, we focus on recent research on bismuth-based TQMs, including quantum-spin Hall insulators, 3D weak topological insulators (TIs), high-order TIs, topological Dirac semi-metals and dual TIs. Efficient methods for the modulation of the topological properties of the TQMs are introduced, such as interlayer interaction, thickness variation and local electric field perturbation. Finally, the challenges and prospects for this field of study are discussed.
Correction: Corrigendum: 3D hierarchical porous graphene aerogel with tunable meso-pores on graphene nanosheets for high-performance energy storage
Publisher: Springer Science and Business Media LLC
Date: 07-01-2016
DOI: 10.1038/SREP17243
Abstract: New and novel 3D hierarchical porous graphene aerogels (HPGA) with uniform and tunable meso-pores (e.g., 21 and 53 nm) on graphene nanosheets (GNS) were prepared by a hydrothermal self-assembly process and an in-situ carbothermal reaction. The size and distribution of the meso-pores on the in idual GNS were uniform and could be tuned by controlling the sizes of the Co 3 O 4 NPs used in the hydrothermal reaction. This unique architecture of HPGA prevents the stacking of GNS and promises more electrochemically active sites that enhance the electrochemical storage level significantly. HPGA, as a lithium-ion battery anode, exhibited superior electrochemical performance, including a high reversible specific capacity of 1100 mAh/g at a current density of 0.1 A/g, outstanding cycling stability and excellent rate performance. Even at a large current density of 20 A/g, the reversible capacity was retained at 300 mAh/g, which is larger than that of most porous carbon-based anodes reported, suggesting it to be a promising candidate for energy storage. The proposed 3D HPGA is expected to provide an important platform that can promote the development of 3D topological porous systems in a range of energy storage and generation fields.
Pauli-limited effect in the magnetic phase diagram of FeSex Te1-x thin films
Publisher: AIP Publishing
Date: 30-11-2015
DOI: 10.1063/1.4936848
Abstract: We present a detailed investigation on the doping dependence of the upper critical field Hc2(T) of FeSexTe1−x thin films (0.18 ≤ x ≤ 0.90) by measuring the electrical resistivity as a function of magnetic field. The Hc2(T) curves exhibit a downturn behavior with decreasing temperature in all the s les, owing to the Pauli-limited effect (spin paramagnetic effect). The Pauli-limited effect on the upper critical field can be monotonically modulated by variation of the Se/Te composition. Our results show that Te-doping induced disorder and excess Fe atoms give rise to enhancement of the Pauli-limited effect.
Epitaxial growth mechanism of silicene on Ag(111)
Publisher: IEEE
Date: 02-2014
Boosting Sodium Storage of Double‐Shell Sodium Titanate Microspheres Constructed from 2D Ultrathin Nanosheets via Sulfur Doping
Publisher: Wiley
Date: 10-10-2018
Abstract: Sodium-ion batteries (SIBs) have drawn remarkable attention due to their low cost and the practically inexhaustible sodium sources. The major obstacle for the practical application of SIBs is the absence of suitable negative electrode materials with long cycling stability and high rate performance. Here, sulfur-doped double-shell sodium titanate (Na
Finely dispersed Au nanoparticles on graphitic carbon nitride as highly active photocatalyst for hydrogen peroxide production
Publisher: Elsevier BV
Date: 04-2019
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
Recent Progress on 2D Kagome Magnets: Binary TmSnn (T = Fe, Co, Mn)
Publisher: Wiley
Date: 23-09-2021
Abstract: Due to the particularity of the lattice geometry, intriguing electronic characteristics of Dirac cone and flat band can coexist in the two‐dimensional (2D) kagome lattice. The 2D kagome materials, therefore, have attracted tremendous attention, as a platform for studying the topological non‐trivial band structures and strong correlated phenomena. In this paper, the recent experimental progress on binary kagome metals Fe 3 Sn 2 , FeSn, CoSn, and Mn 3 Sn, mainly by the methods of scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), and angle‐resolved photoemission spectroscopy (ARPES), are reviewed. In those compounds, the kagome layers give rise to the electronic structure of flat bands and Dirac cones, which induce a wide range of novel electron behaviors. Their exposed surface structure, electronic band structure, and topological properties are therefore highlighted, aiming at illustrating the determining role of their 2D kagome layers. In addition, the interplay between frustrated kagome geometry, frustrated magnetism, and topological magnetism, which brings new opportunities and broad prospects to the research of strongly correlated topological kagome magnetic materials, is introduced through reviewing recent experimental works by electronic and magnetic transport measurements.
Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles
Publisher: AIP Publishing
Date: 04-2011
DOI: 10.1063/1.3561377
Abstract: Hollow BiFeO3 nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO3 nanoparticles. These hollow and core-shell multiferroic nanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO3 particles exhibits a lower switching electric field, which is confirmed by Kelvin probe force microscopy.
Giant and anisotropic magnetoresistances in p-type Bi-doped Sb 2 Te 3 bulk single crystals
Publisher: IOP Publishing
Date: 10-2012
The origin of the enhanced photocatalytic activity of carbon nitride nanotubes: a first-principles study
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA09747B
Abstract: Being wrapped into nanotubes benefits both the band gap (visible light absorption) and oxidative potential of g-C 3 N 4 .
Unabridged phase diagram for single-phased FeSex Te1-x thin films
Publisher: Springer Science and Business Media LLC
Date: 02-12-2014
DOI: 10.1038/SREP07273
Synthesis of Multilayer Silicene on Si(111)√3 × √3-Ag
Publisher: American Chemical Society (ACS)
Date: 20-11-2017
Noncoplanar antiferromagnetism induced zero thermal expansion behavior in the antiperovskite
Mn 3<
Publisher: American Physical Society (APS)
Date: 14-03-2023
Realization of Strained Stanene by Interface Engineering
Publisher: American Chemical Society (ACS)
Date: 18-03-2019
DOI: 10.1021/ACS.JPCLETT.9B00348
Abstract: Stanene, the tin analogue of graphene, has been predicted to be a two-dimensional topological insulator, providing an ideal platform for the realization of the quantum spin Hall effect even at room temperature. Here, continuous stanene has been successfully formed on the Au(111) substrate, and its crystalline structure, phonon properties, and electronic structures are investigated by scanning tunneling microscopy and in situ Raman spectroscopy combined with first-principles calculations. The surface Sn-Au alloy with a coverage-dependent structural evolution is first identified. At coverage above a critical value, the Au-Sn alloy is gradually converted into epitaxial stanene with a √3 × √7 superstructure. Distinctive vibrational phonon modes are discovered in √3 × √7 stanene through in situ Raman spectroscopy, which are correlated with the tensile strain evoked by its singular buckled structure. Our results present clear evidence for the existence of epitaxial stanene and provide a platform for exploration of the exotic properties of this strained two-dimensional material.
Band Gap Modulated by Electronic Superlattice in Blue Phosphorene
Publisher: American Chemical Society (ACS)
Date: 09-05-2018
Abstract: Exploring stable two-dimensional materials with appropriate band gaps and high carrier mobility is highly desirable due to the potential applications in optoelectronic devices. Here, the electronic structures of phosphorene on a Au(111) substrate are investigated by scanning tunneling spectroscopy, angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations. The substrate-induced phosphorene superstructure gives a superlattice potential, leading to a strong band folding effect of the sp band of Au(111) on the band structure. The band gap could be clearly identified in the ARPES results after examining the folded sp band. The value of the energy gap (∼1.1 eV) and the high charge carrier mobility comparable to that of black phosphorus, which is engineered by the tensile strain, are revealed by the combination of ARPES results and DFT calculations. Furthermore, the phosphorene layer on the Au(111) surface displays high surface inertness, leading to the absence of multilayer phosphorene. All these results suggest that the phosphorene on Au(111) could be a promising candidate, not only for fundamental research but also for nanoelectronic and optoelectronic applications.
Improving the Solubility of Mn and Suppressing the Oxygen Vacancy Density in Zn0.98Mn0.02O Nanocrystals via Octylamine Treatment
Publisher: American Chemical Society (ACS)
Date: 12-09-2012
DOI: 10.1021/AM301471V
Abstract: Zn(0.98)Mn(0.02)O nanocrystals were synthesized by the wet chemical route and were treated with different content of octylamine. The environment around Mn and the defect type and concentration were characterized by photoluminescence, Raman, X-ray photoelectron spectroscopy, and X-ray absorption fine structure. It is found that N codoping effectively enhances the solubility of Mn substituting Zn via reducing donor binding energy of impurity by the orbital hybridization between the N-acceptor and Mn-donor. On the other hand, the O atoms released from MnO(6) and the N ions from octylamine occupy the site of oxygen vacancies and result in reduction of the concentration of oxygen vacancies in Zn(0.98)Mn(0.02)O nanocrystals.
Roles of Cocatalysts on BiVO4 Photoanodes for Photoelectrochemical Water Oxidation: A Minireview
Publisher: American Chemical Society (ACS)
Date: 15-06-2022
Effect of chromium substitution on structure and magnetic properties of Bi2Fe4O9
Publisher: Elsevier BV
Date: 10-2010
A Yolk–Shell Structured Silicon Anode with Superior Conductivity and High Tap Density for Full Lithium-Ion Batteries
Publisher: Wiley
Date: 20-05-2019
Abstract: The poor cycling stability resulting from the large volume expansion caused by lithiation is a critical issue for Si-based anodes. Herein, we report for the first time of a new yolk-shell structured high tap density composite made of a carbon-coated rigid SiO
Bismuth Oxybromide with Reasonable Photocatalytic Reduction Activity under Visible Light
Publisher: American Chemical Society (ACS)
Date: 19-02-2014
DOI: 10.1021/CS401025U
Adsorption of molecules on silicene
Publisher: Springer International Publishing
Date: 2016
Cooperative Electron-Phonon Coupling and Buckled Structure in Germanene on Au(111)
Publisher: American Chemical Society (ACS)
Date: 23-02-2017
Abstract: Germanene, a single-atom-thick germanium nanosheet in a honeycomb lattice, was proposed to be a Dirac fermion material beyond graphene. We performed scanning tunneling microscopy and in situ Raman spectroscopy studies combined with first-principles calculations on the atomic structures and the electronic and phonon properties of germanene on Au(111). The low-buckled 1 × 1 germanene honeycomb lattice was determined to exist in an unexpected rectangular √7 × √7 superstructure. Through in situ Raman measurements, distinctive vibrational phonon modes were discovered in √7 × √7 germanene, revealing the special coupling between the Dirac fermion and lattice vibrations, namely, electron-phonon coupling (EPC). The significant enhancement of EPC is correlated with the tensile strain, which is evoked by the singular buckled structure of √7 × √7 germanene on the Au(111) substrate. Our results present clear evidence for the existence of epitaxial germanene and elucidate the exotic properties of germanene on Au(111).
Kondo Holes in the Two-Dimensional Itinerant Ising Ferromagnet Fe3GeTe2
Publisher: American Chemical Society (ACS)
Date: 19-07-2021
Magnetic and ferroelectric properties of multiferroic Bi2NiMnO6 nanoparticles
Publisher: AIP Publishing
Date: 21-03-2011
DOI: 10.1063/1.3537943
Abstract: Multiferroic Bi2NiMnO6 nanoparticles were synthesized by a simple electrospray method. Bi2NiMnO6 nanoparticles crystallize in the monoclinic structure with space group C121. The particles show a uniform spherical shape with a diameter of 100 nm to 300 nm. The ferromagnetic transition of Bi2NiMnO6 is confirmed at 122 K. The room temperature ferroelectricity of the Bi2NiMnO6 nanoparticles is verified by Kelvin probe force microscopy.
Role of Atomic Interaction in Electronic Hybridization in Two-Dimensional Ag2Ge Nanosheets
Publisher: American Chemical Society (ACS)
Date: 26-07-2017
Direct cation exchange of surface ligand capped upconversion nanocrystals to produce strong luminescence
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC04924F
Abstract: We develop a facile and rapid cation exchange method for upconversion nanocrystals (UCNCs) without removing surface ligands.
Two-dimensional metal–organic frameworks with high oxidation states for efficient electrocatalytic urea oxidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CC06378D
Abstract: A two-dimensional metal–organic framework comprising nickel species and an organic ligand of benzenedicarboxylic acid is fabricated and explored as an electrocatalyst for urea oxidation reaction.
Metal-ion bridged high conductive RGO-M-MoS2 (M = Fe3+, Co2+, Ni2+, Cu2+ and Zn2+) composite electrocatalysts for photo-assisted hydrogen evolution
Publisher: Elsevier BV
Date: 06-2019
Oxygen-vacancy effect on structural, magnetic, and ferroelectric properties in multiferroic YMnO 3 single crystals
Publisher: AIP Publishing
Date: 02-03-2012
DOI: 10.1063/1.3676000
Abstract: We have investigated the structural, magnetic, and ferroelectric properties of magnetically frustrated multiferroic YMnO3 single crystals. The ferroelectric domain structures of YMnO3 s les were studied by piezoresponse force microscopy. Instead of domain vortex structure in stoichiometric crystals, YMnO3−δ exhibits a random domain configuration with straight domain walls. In magnetic measurements, the YMnO3−δ crystal shows typical antiferromagnetic behavior with higher Néel temperature and lower magnetization compared to the stoichiometric s le. The ordered oxygen vacancies dominate multiferroicity through tailoring the domain wall structure.
Defect Sites-Rich Porous Carbon with Pseudocapacitive Behaviors as an Ultrafast and Long-Term Cycling Anode for Sodium-Ion Batteries.
Publisher: American Chemical Society (ACS)
Date: 23-02-2018
Abstract: Room-temperature sodium-ion batteries have been regarded as promising candidates for grid-scale energy storage due to their low cost and the wide distribution of sodium sources. The main scientific challenge for their practical application is to develop suitable anodes with long-term cycling stability and high rate capacity. Here, novel hierarchical three-dimensional porous carbon materials are synthesized through an in situ template carbonization process. Electrochemical examination demonstrates that carbonization temperature is a key factor that affects Na
Enhanced energy transfer in heterogeneous nanocrystals for near infrared upconversion photocurrent generation
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR07010A
Abstract: A heterogeneous NaYF 4 :Yb,Tm@ZnO nanoparticle with an epitaxial interface is prepared, and it possesses an enhanced upconversion emission intensity and an excellent photocurrent response.
Activating Titania for Efficient Electrocatalysis by Vacancy Engineering
Publisher: American Chemical Society (ACS)
Date: 11-04-2018
Germanium Nanosheets with Dirac Characteristics as a Saturable Absorber for Ultrafast Pulse Generation
Publisher: Wiley
Date: 21-06-2021
Abstract: Bulk germanium as a group‐IV photonic material has been widely studied due to its relatively large refractive index and broadband and low propagation loss from near‐infrared to mid‐infrared. Inspired by the research of graphene, the 2D counterpart of bulk germanium, germanene, has been discovered and the characteristics of Dirac electrons have been observed. However, the optical properties of germanene still remain elusive. In this work, several layers of germanene are prepared with Dirac electronic characteristics and its morphology, band structure, carrier dynamics, and nonlinear optical properties are systematically investigated. It is surprisingly found that germanene has a fast carrier‐relaxation time comparable to that of graphene and a relatively large nonlinear absorption coefficient, which is an order of magnitude higher than that of graphene in the near‐infrared wavelength range. Based on these findings, germanene is applied as a new saturable absorber to construct an ultrafast mode‐locked laser, and sub‐picosecond pulse generation in the telecommunication band is realized. The results suggest that germanene can be used as a new type of group‐IV material for various nonlinear optics and photonic applications.
Construction of 2D lateral pseudoheterostructures by strain engineering
Publisher: IOP Publishing
Date: 22-05-2017
Capturing the active sites of multimetallic (oxy)hydroxides for the oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE01609H
Abstract: The catalytic active sites of NiFe and NiFeCr (oxy)hydroxides are revealed by operando spectroscopic techonologies for alkaline water oxidation.
Growth Mechanism for ZnO Nanorod Array in a Metastable Supersaturation Solution
Publisher: American Scientific Publishers
Date: 02-2009
Abstract: ZnO nanorod array with vertical orientation was fabricated by a simple aqueous solution way in the mild condition. ZnO granular film coated on glass substrate was used as a seeds film for the growth of ZnO ordered array. A metastable supersaturation area where there was no homogeneous nucleation of ZnO in the bulk solution but heterogeneous nucleation on the ZnO granular film was found. It was proved that high-quality and dense ZnO nanorod array could be obtained under this condition. The microstructures of ZnO nanorod array were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS). The results indicated that ZnO nanorod array nucleated and grew vertically on the ZnO granular film along the [002] direction. The diameter and length of ZnO rod was greatly affected by growth solution concentration, reaction temperature, and metastable supersaturation status. The growth mechanism was discussed in detail.
Native Surface Oxides Featured Liquid Metals for Printable Self-Powered Photoelectrochemical Device
Publisher: Frontiers Media SA
Date: 22-05-2019
High field (14 T) magneto transport of Sm/PrFeAsO
Publisher: AIP Publishing
Date: 29-02-2012
DOI: 10.1063/1.3675156
Abstract: We report high field magneto transport of Sm/PrFeAsO. Below spin density wave transition (TSDW), the magneto-resistance (MR) of Sm/PrFeAsO is positive and increasing with decreasing temperature. The MR of SmFeAsO is found to be 16%, whereas it is 21.5% in the case of PrFeAsO, at 2.5 K under applied magnetic field of 14 Tesla (T). In the case of SmFeAsO, the variation of isothermal MR with field below 20 K is nonlinear at lower magnetic fields (& T) and it is linear at moderately higher magnetic fields (H ≥ 3.5 T). On the other hand, PrFeAsO shows almost linear MR at all temperatures below 20 K. The anomalous behavior of MR being exhibited in PrFeAsO is originated from Dirac cone states. The stronger interplay of Fe and Pr ordered moments is responsible for this distinct behavior. PrFeAsO also shows a hump in resistivity (R-T) with a possible conduction band (FeAs) mediated ordering of Pr moments at around 12 K. However, the same is absent in SmFeAsO even down to 2 K. Our results of high field magneto-transport of up to 14 T brings about clear distinction between ground states of SmFeAsO and PrFeAsO.
Ordered platinum–bismuth intermetallic clusters with Pt-skin for a highly efficient electrochemical ethanol oxidation reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA09553A
Abstract: A monatomic Pt layer (Pt-skin) on ordered intermetallic PtBi clusters (PtBi@Pt) supported on graphene is fabricated via a single atom self-assembling (SAS) method to form a superior catalyst toward electrochemical ethanol oxidation reaction.
Nanostructured Magnetic Materials
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/492093
Magnetoelectric coupling in nanoscale 0–1 connectivity
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR05182H
Abstract: Magnetoelectric coupling in novel 0–1 connectivity, allowing the use of nanomaterials to fabricate ME composites.
Boosting NIR-driven photocatalytic water splitting by constructing 2D/3D epitaxial heterostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA02780G
Abstract: YF 3 :Yb, Tm@BiOCl possesses epitaxial heterostructure, which can quantitatively activate multiple energy transfer channels including excited-state energy transfer and fluorescence reabsorption, and then promote the NIR-driven photocatalytic properties.
Author Correction: Epitaxial growth of an atom-thin layer on a LiNi0.5Mn1.5O4 cathode for stable Li-ion battery cycling
Publisher: Springer Science and Business Media LLC
Date: 16-09-2022
Dirac Signature in Germanene on Semiconducting Substrate
Publisher: Wiley
Date: 04-05-2018
Metal-silicene interaction studied by scanning tunneling microscopy
Publisher: IOP Publishing
Date: 24-12-2016
DOI: 10.1088/0953-8984/28/3/034002
Abstract: Ag atoms have been deposited on 3 × 3 silicene and √3 × √3 silicene films by molecular beam epitaxy method in ultrahigh vacuum. Using scanning tunneling microscopy and Raman spectroscopy, we found that Ag atoms do not form chemical bonds with both 3 × 3 silicene and √3 × √3 silicene films, which is due to the chemically inert surface of silicene. On 3 × 3 silicene films, Ag atoms mostly form into stable flat-top Ag islands. In contrast, Ag atoms form nanoclusters and glide on silicene films, suggesting a more inert nature. Raman spectroscopy suggests that there is more sp (2) hybridization in √3 × √3 than in √7 × √7/3 × 3 silicene films.
Investigation of electron-phonon coupling in epitaxial silicene by in situ Raman spectroscopy
Publisher: American Physical Society (APS)
Date: 23-04-2015
Enhanced Photocatalytic Activity of Bi 24 O 31 Br 10 : Constructing Heterojunction with BiOI
Publisher: Elsevier BV
Date: 03-2017
Nanodroplets for Stretchable Superconducting Circuits
Publisher: Wiley
Date: 26-09-2016
Exchange bias in multiferroic BiFeO3 and YMnO3 multilayers: One more parameter for magnetoelectric manipulation
Publisher: Elsevier BV
Date: 08-2011
Microscopic origin of highly enhanced supercurrent in 122 pnictide superconductor
Publisher: Elsevier BV
Date: 11-2014
Fabrication of a Single‐Atom Platinum Catalyst for the Hydrogen Evolution Reaction: A New Protocol by Utilization of HxMoO3−x with Plasmon Resonance
Publisher: Wiley
Date: 06-02-2018
Manipulation of domain wall mobility by oxygen vacancy ordering in multiferroic YMnO3
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP52892H
Abstract: The mobility of the ferroelectric domain phases and the local conductivity of ferroelectric domain walls in multiferroic YMnO3 crystals grown in air and reduced atmosphere were studied by piezoresponse force microscopy (PFM), tip-enhanced Raman spectroscopy (TERS) and conductive atomic force microscopy (CAFM). Oxygen vacancies were found to reduce the strength of 4d-2p (Y(3+)-O(2-)) hybridization and structural trimerization distortion, leading to the disappearance of the six wedge-shaped ferroelectric domain phases in oxygen deficient YMnO3-δ crystals. We observed anisotropic domain wall motion such that the wedge-shaped domain configuration joined at one point could be changed to the stripe domain configuration by applying high electric fields in oxygen deficient YMnO3-δ single crystals. The local conductivity of the domain walls increased significantly in poled YMnO3-δ single crystals. The straight conductive domain walls in YMnO3-δ, instead of the twisted insulating ones in the stoichiometric crystal, are induced by the ordered oxygen vacancies which are verified by TERS measurements.
Rayleigh-Instability-Induced Bismuth Nanorod@Nitrogen-Doped Carbon Nanotubes as A Long Cycling and High Rate Anode for Sodium-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 06-02-2019
DOI: 10.1021/ACS.NANOLETT.8B05189
Abstract: Sodium-ion battery (SIB) as one of the most promising large-scale energy storage devices has drawn great attention in recent years. However, the development of SIBs is limited by the lacking of proper anodes with long cycling lifespans and large reversible capacities. Here we present rational synthesis of Rayleigh-instability-induced bismuth nanorods encapsulated in N-doped carbon nanotubes (Bi@N-C) using Bi
Experimental Realization of Two-Dimensional Buckled Lieb Lattice
Publisher: American Chemical Society (ACS)
Date: 17-03-2020
Fast Responsive and Controllable Liquid Transport on a Magnetic Fluid/Nanoarray Composite Interface
Publisher: American Chemical Society (ACS)
Date: 20-05-2016
Abstract: Controllable liquid transport on surface is expected to occur by manipulating the gradient of surface tension/Laplace pressure and external stimuli, which has been intensively studied on solid or liquid interface. However, it still faces challenges of slow response rate, and uncontrollable transport speed and direction. Here, we demonstrate fast responsive and controllable liquid transport on a smart magnetic fluid/nanoarray interface, i.e., a composite interface, via modulation of an external magnetic field. The wettability of the composite interface to water instantaneously responds to gradient magnetic field due to the magnetically driven composite interface gradient roughness transition that takes place within a millisecond, which is at least 1 order of magnitude faster than that of other responsive surfaces. A water droplet can follow the motion of the gradient composite interface structure as it responds to the gradient magnetic field motion. Moreover, the water droplet transport direction can be controlled by modulating the motion direction of the gradient magnetic field. The composite interface can be used as a pump for the transport of immiscible liquids and other objects in the microchannel, which suggests a way to design smart interface materials and microfluidic devices.
High-performance room-temperature sodium–sulfur battery enabled by electrocatalytic sodium polysulfides full conversion
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9EE03251G
Abstract: Developing novel gold nanoclusters as an electrocatalyst can facilitate a completely reversible reaction between S and Na, achieving advanced high-energy-density room-temperature sodium–sulfur batteries.
Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CP01419D
Abstract: Magnetic-field-driven manipulation and transport of oil-based magnetic fluids are demonstrated under water by using tri-phase systems.
Effects of Cu and Fe doping on Raman spectra and on the structural and magnetic properties of ErMnO3
Publisher: AIP Publishing
Date: 22-03-2011
DOI: 10.1063/1.3540695
Abstract: Single phase ErMexMn1−xO3 (Me = Cu, Fe 0 ≤ x ≤ 0.1) s les were synthesized by the solid state reaction method. The differences between the doping effects on the Raman spectra and on the structural, magnetic, and thermal properties of the two systems have been systematically investigated. In the ErCuxMn1−xO3 system, lattice parameter a increases with doping, while lattice parameter c decreases. It is more complicated in the ErFexMn1−xO3 system, where lattice parameter a decreases with doping, while lattice parameter c is enhanced after an initial slight decrease. Raman spectra show that the phonon peaks of ErFexMn1−xO3 slightly shift to higher frequencies with doping, while those of ErCuxMn1−xO3 apparently shift toward lower frequencies. Heat capacity data indicates that the Néel temperature of ErMnO3 is reduced to 61 K for ErCu0.1Mn0.9O3 by Cu doping, whereas it is slightly enhanced to 79 K for ErFe0.1Mn0.9O3 through Fe doping.
Superhydrophobic Shape Memory Polymer Arrays with Switchable Isotropic/Anisotropic Wetting
Publisher: Wiley
Date: 15-12-2017
Room temperature perpendicular exchange bias in CoNi/(Co,Ni)O multilayers with perpendicular magnetic anisotropy directly induced by FM/AFM interface
Publisher: Elsevier BV
Date: 03-2019
Progress and perspectives of bismuth oxyhalides in catalytic applications
Publisher: Elsevier BV
Date: 2021
General Synthetic Strategy for Pomegranate-like Transition-Metal Phosphides@N-Doped Carbon Nanostructures with High Lithium Storage Capacity
Publisher: American Chemical Society (ACS)
Date: 16-07-2019
Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)
Publisher: AIP Publishing
Date: 11-2010
DOI: 10.1063/1.3505800
Abstract: Perovskite-type Nd1−xLaxCrO3 (0≤x≤1.0) polycrystalline s les were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal–oxygen bond lengths, and angles of Nd1−xLaxCrO3 strongly depend on the La content. Two magnetic transition temperatures, Cr3+ antiferromagnetic ordering temperature (TN) and the spin reorientation phase transition temperature (TSRPT), have been observed in the M-T curves. The increase in TN and decrease in TSRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd1−xLaxCrO3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr3+ 3dt2g orbital and the Nd3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr–Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM–RE magnetic interactions in perovskite compounds, in agreement with the proposed model.
Boosting Light‐Driven Photocatalytic Water Splitting of Bi4NbO8Br by Polarization Field
Publisher: Wiley
Date: 09-2022
Honeycomb silicon: a review of silicene
Publisher: Elsevier BV
Date: 09-2015
Enhancement of ferromagnetic and dielectric properties in lanthanum doped BiFeO3 by hydrothermal synthesis
Publisher: Elsevier BV
Date: 02-2010
Controlled hydrogenation into defective interlayer bismuth oxychloride via vacancy engineering
Publisher: Springer Science and Business Media LLC
Date: 05-06-2020
DOI: 10.1038/S42004-020-0319-9
Abstract: Hydrogenation is an effective approach to improve the performance of photocatalysts within defect engineering methods. The mechanism of hydrogenation and synergetic effects between hydrogen atoms and local electronic structures, however, remain unclear due to the limits of available photocatalytic systems and technical barriers to observation and measurement. Here, we utilize oxygen vacancies as residential sites to host hydrogen atoms in a layered bismuth oxychloride material containing defects. It is confirmed theoretically and experimentally that the hydrogen atoms interact with the vacancies and surrounding atoms, which promotes the separati30on and transfer processes of photo-generated carriers via the resulting band structure. The efficiency of catalytic activity and selectivity of defective bismuth oxychloride regarding nitric oxide oxidation has been improved. This work clearly reveals the role of hydrogen atoms in defective crystalline materials and provides a promising way to design catalytic materials with controllable defect engineering.
Raman Studies on Silicene and Germanene
Publisher: Thomas Telford Ltd.
Date: 30-10-2017
Ordered-vacancy-enabled indium sulphide printed in wafer-scale with enhanced electron mobility
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9MH01365B
Abstract: The unique and long-range ordered-vacancy structure in wafer-scale grown single-unit-cell-thick In 2 S 3 facilitates excellent electronic performance.
High Pressure Driven Isostructural Electronic Phase Separation in 2D BiOI
Publisher: Wiley
Date: 21-02-2019
Hydrothermal Synthesized Bismuth Ferrites Particles: Thermodynamic, Structural, and Magnetic Properties
Publisher: American Scientific Publishers
Date: 02-2012
Abstract: A family of bismuth ferrites (BFO), including Bi2Fe4O9, BiFeO3, and Bi25FeO39 with different morphologies, has been prepared by the hydrothermal method assisted by different alkaline mineralizers. X-ray diffraction refinement calculations are carried out to study the crystal structures of bismuth ferrites. A thermodynamic calculation based on the dissolution-precipitation model was carried out to analyze the hydrothermal synthesis of BFO powders. Magnetic measurements of the obtained bismuth ferrites show different magnetic properties from 5 K to 350 K.
Anisotropy of crystal growth mechanisms, dielectricity, and magnetism of multiferroic Bi2FeMnO6 thin films
Publisher: AIP Publishing
Date: 11-03-2013
DOI: 10.1063/1.4794724
Abstract: Epitaxial Bi2FeMnO6 (BFMO) thin films deposited on various Nb:SrTiO3 substrates show that the lattice parameters are very sensitive to epitaxial strains. Compressive and tensile strains are induced to the in-plane lattice constants of the (100) and (111) oriented films, respectively, while that of the (110) oriented thin film stay unstrained. The thin films also exhibit a strongly anisotropic growth habit depending on the substrate. Spiral growth, such as in the (100) BFMO film, is unique in s les prepared by pulsed laser deposition. Extrinsic dielectric constants at low frequencies are attributed to oxygen vacancies via the Maxwell-Wagner effect. All the s les show saturated hysteresis loops with very small coercive fields at 200 K, indicating the presence of weak ferromagnetism.
Heterovalent‐Doping‐Enabled Efficient Dopant Luminescence and Controllable Electronic Impurity Via a New Strategy of Preparing II−VI Nanocrystals
Publisher: Wiley
Date: 27-03-2015
Abstract: Substitutional heterovalent doping represents an effective method to control the optical and electronic properties of nanocrystals (NCs). Highly monodisperse II-VI NCs with deep substitutional dopants are presented. The NCs exhibit stable, dominant, and strong dopant fluorescence, and control over n- and p-type electronic impurities is achieved. Large-scale, bottom-up superlattices of the NCs will speed up their application in electronic devices.
Efficient visible-light photocatalysts by constructing dispersive energy band with anisotropic p and s-p hybridization states
Publisher: Elsevier BV
Date: 08-2017
Bio-Inspired Multifunctional Metallic Foams Through the Fusion of Different Biological Solutions
Publisher: Wiley
Date: 07-03-2014
Selective Ferroelectric BiOI/Bi 4 Ti 3 O 12 Heterostructures for Visible Light-Driven Photocatalysis
Publisher: American Chemical Society (ACS)
Date: 13-12-2019
Effects of Oxygen Adsorption on the Surface State of Epitaxial Silicene on Ag(111)
Publisher: Springer Science and Business Media LLC
Date: 18-12-2014
DOI: 10.1038/SREP07543
Boosting Visible-Light-Driven Photo-oxidation of BiOCl by Promoted Charge Separation via Vacancy Engineering
Publisher: American Chemical Society (ACS)
Date: 11-01-2019
3D hierarchical porous graphene aerogel with tunable meso-pores on graphene nanosheets for high-performance energy storage
Publisher: Springer Science and Business Media LLC
Date: 18-09-2015
DOI: 10.1038/SREP14229
Abstract: New and novel 3D hierarchical porous graphene aerogels (HPGA) with uniform and tunable meso-pores (e.g., 21 and 53 nm) on graphene nanosheets (GNS) were prepared by a hydrothermal self-assembly process and an in-situ carbothermal reaction. The size and distribution of the meso-pores on the in idual GNS were uniform and could be tuned by controlling the sizes of the Co 3 O 4 NPs used in the hydrothermal reaction. This unique architecture of HPGA prevents the stacking of GNS and promises more electrochemically active sites that enhance the electrochemical storage level significantly. HPGA, as a lithium-ion battery anode, exhibited superior electrochemical performance, including a high reversible specific capacity of 1100 mAh/g at a current density of 0.1 A/g, outstanding cycling stability and excellent rate performance. Even at a large current density of 20 A/g, the reversible capacity was retained at 300 mAh/g, which is larger than that of most porous carbon-based anodes reported, suggesting it to be a promising candidate for energy storage. The proposed 3D HPGA is expected to provide an important platform that can promote the development of 3D topological porous systems in a range of energy storage and generation fields.
Seed mediated one-pot growth of versatile heterogeneous upconversion nanocrystals for multimodal bioimaging
Publisher: SPIE
Date: 09-12-2016
DOI: 10.1117/12.2245172
Enhancement of charge separation in ferroelectric heterogeneous photocatalyst Bi4(SiO4)3/Bi2SiO5 nanostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7DT03193A
Abstract: Excellent photocatalytic activity is given rise to enhanced charge separation in ferroelectric heterogeneous Bi 4 (SiO 4 ) 3 /Bi 2 SiO 5 photocatalyst.
A dye-sensitized visible light photocatalyst-Bi24O31Cl10
Publisher: Springer Science and Business Media LLC
Date: 09-12-2014
DOI: 10.1038/SREP07384
Hydrogen Terminated Germanene for a Robust Self-Powered Flexible Photoelectrochemical Photodetector
Publisher: Wiley
Date: 10-05-2020
Photocatalytic properties of BiOX (X = Cl, Br, and I)
Publisher: Springer Science and Business Media LLC
Date: 06-2008
Multiferroic double-perovskite Bi2FeMnO6 hollow particles
Publisher: Elsevier BV
Date: 05-2011
One-pot synthesis of porous 1T-phase MoS2 integrated with single-atom Cu doping for enhancing electrocatalytic hydrogen evolution reaction
Publisher: Elsevier BV
Date: 08-2019
Aqueous Electrolytes with Hydrophobic Organic Cosolvents for Stabilizing Zinc Metal Anodes.
Publisher: American Chemical Society (ACS)
Date: 27-05-2022
Abstract: Rechargeable aqueous zinc (Zn) batteries are promising for large-energy storage because of their low cost, high safety, and environmental compatibility, but their implementation is hindered by the severe irreversibility of Zn metal anodes as exemplified by water-induced side reactions (H
Silicene: A Promising Anode for Lithium-Ion Batteries
Publisher: Wiley
Date: 22-03-2017
Abstract: Silicene, a single-layer-thick silicon nanosheet with a honeycomb structure, is successfully fabricated by the molecular-beam-epitaxy (MBE) deposition method on metallic substrates and by the solid-state reaction method. Here, recent progress on the features of silicene that make it a prospective anode for lithium-ion batteries (LIBs) are discussed, including its charge-carrier mobility, chemical stability, and metal-silicene interactions. The electrochemical performance of silicene is reviewed in terms of both theoretical predictions and experimental measurements, and finally, its challenges and outlook are considered.
Realization of flat band with possible nontrivial topology in electronic Kagome lattice
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-11-2018
Abstract: We observed electronic Kagome lattice and possible nontrivial electronic flat band in twisted multilayer silicene at 77 K.
Boron Nitride Nanotubes for Ammonia Synthesis: Activation by Filling Transition Metals
Publisher: American Chemical Society (ACS)
Date: 16-12-2020
DOI: 10.1021/JACS.9B10588
Abstract: Boron nitride (BN), with outstanding stability and robustness in erse polymorphs, possesses many advantageous properties for industrial applications. Activation of BN materials for nonmetal catalysts is among the most revolutionary and challenging tasks. Taking advantage of quantum size effect and synergistic effect, here we exploit boron nitride nanotubes (BNNTs) encapsulating early transition metal nanowires, which is experimentally feasible, for nitrogen fixation and ammonia synthesis. Using first-principles calculations and microkinetic modeling, we show that the coexisting occupied and unoccupied p states of B atoms in filled BNNTs can effectively mimic the d states of transition metal. They act as electron reservoirs with tunable orbital energies and occupancy, which are beneficial for associative N
Magnetic properties and microstructures of iron oxide@mesoporous silica core-shell composite for applications in magnetic dye separation
Publisher: AIP Publishing
Date: 06-02-2012
DOI: 10.1063/1.3670049
Abstract: In this report, hollow mesoporous silica (HMS) and iron oxide-hollow mesoporous silica (FexOy@HMS) core-shell composite were prepared by a one-step facile fabrication method. Transmission electron microscopy, X-ray diffraction, N2 adsorption–desorption isotherms, and vibrating s le magnetometer were used to characterize the morphology, microstructure, and magnetic properties of the HMS and core-shell composite. The magnetic separability of FexOy@HMS core-shell composite was tested in Rhodamine B (Rh.B) dye solution. The results indicate that the core-shell composite can absorb Rh.B dyes molecules effectively up to 90.1%.
Photocatalytic Reduction on Bismuth-Based p-Block Semiconductors
Publisher: American Chemical Society (ACS)
Date: 29-10-2018
Tuning the band gap in silicene by oxidation
Publisher: American Chemical Society (ACS)
Date: 30-09-2014
DOI: 10.1021/NN504451T
Abstract: Silicene monolayers grown on Ag(111) surfaces demonstrate a band gap that is tunable by oxygen adatoms from semimetallic to semiconducting type. With the use of low-temperature scanning tunneling microscopy, we find that the adsorption configurations and amounts of oxygen adatoms on the silicene surface are critical for band gap engineering, which is dominated by different buckled structures in √13 × √13, 4 × 4, and 2√3 × 2√3 silicene layers. The Si-O-Si bonds are the most energy-favored species formed on √13 × √13, 4 × 4, and 2√3 × 2√3 structures under oxidation, which is verified by in situ Raman spectroscopy as well as first-principles calculations. The silicene monolayers retain their structures when fully covered by oxygen adatoms. Our work demonstrates the feasibility of tuning the band gap of silicene with oxygen adatoms, which, in turn, expands the base of available two-dimensional electronic materials for devices with properties that is hardly achieved with graphene oxide.
Structural, dielectric, antiferromagnetic, and thermal properties of the frustrated hexagonal Ho
Publisher:
American Physical Society (APS)
Date:
06-04-2011
Publisher: American Physical Society (APS)
Date: 06-04-2011
Application of organic-inorganic hybrids in lithium batteries
Publisher: Elsevier BV
Date: 12-2020
Electronic Band Engineering in Elemental 2D Materials
Publisher: Wiley
Date: 28-08-2018
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