ORCID Profile
0000-0002-7860-2023
Current Organisation
University of Sydney
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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 | Nanoscale Characterisation | Condensed Matter Physics | Metals and Alloy Materials | Materials Engineering Not Elsewhere Classified | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Nanotechnology | Nanomaterials | Nanotechnology | Compound Semiconductors | Condensed Matter Physics—Electronic And Magnetic Properties; | Condensed Matter Physics—Structural Properties | Ceramics | Composite Materials | Alloy Materials | Materials Engineering not elsewhere classified | Medicinal and Biomolecular Chemistry not elsewhere classified | Ceramics | Photonics, Optoelectronics and Optical Communications | Mathematical Physics | Biomaterials | Solid State Chemistry | Biomaterials | Climatology (Incl. Palaeoclimatology) | Surfaces and Structural Properties of Condensed Matter | Condensed Matter Imaging | Condensed Matter Characterisation Technique Development | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Physical sciences | Expanding Knowledge in the Chemical Sciences | Energy Conservation and Efficiency not elsewhere classified | Renewable energy not elsewhere classified (e.g. geothermal) | Structural Metal Products | Integrated circuits and devices | Solar-thermal electric | Solar-photoelectric | Biological sciences | Chemical sciences | Ceramics, glass and industrial mineral products not elsewhere classified | Energy Storage (excl. Hydrogen) | Ground transport not elsewhere classified | Computer hardware and electronic equipment not elsewhere classified | Energy Storage, Distribution and Supply not elsewhere classified | Other | Energy storage | Electricity transmission | Metals (composites, coatings, bonding, etc.) | Medical instrumentation | Scientific instrumentation | Hydrogen Production from Renewable Energy | Energy not elsewhere classified |
Related Links
Publications
First-principles investigation of electrical and magnetic properties of ZnO based diluted magnetic semiconductors codoped with H
Publisher: AIP Publishing
Date: 06-2012
DOI: 10.1063/1.4719977
Abstract: Hydrogen (H) behavior in ZnO based diluted magnetic semiconductors (DMSs) was investigated theoretically. It was found that H exhibits erse electronic and structural behavior across a range of different DMSs, depending on the doped transition metal element. For instance in the extensively debated Co doped ZnO system (ZnO:Co), H dopants do not introduce significant carrier concentrations at room temperature thus carrier mediated magnetism is not attainable by H codoping. In this case, magnetism can be manipulated by other mechanisms. In contrast, in the ZnO:V system, H is positively charged for the entire bandgap region, meaning carrier mediated magnetism may be possible.
Methodology exploration of specimen preparation for atom probe tomography from nanowires
Publisher: Elsevier BV
Date: 12-2015
DOI: 10.1016/J.ULTRAMIC.2015.06.003
Abstract: Semiconductor nanowires have been intensively explored for applications in electronics, photonics, energy conversion and storage. A fundamental and quantitative understanding of growth-structure-property relationships is central to applications where nanowires exhibit clear advantages. Atom Probe Tomography (APT) is able to provide 3 dimensional quantitative elemental distributions at atomic-resolution and is therefore unique in understanding the growth-structure-property relationships. However, the specimen preparation with nanowires is extremely challenging. In this paper, two ion beam free specimen preparation methods for APT are presented which are efficient for various nanowires.
Magnetic properties of fluffy Fe@alpha-Fe O-2 core-shell nanowires
Publisher: Springer Science and Business Media LLC
Date: 17-10-2013
Abstract: Novel fluffy Fe@ α -Fe 2 O 3 core-shell nanowires have been synthesized using the chemical reaction of ferrous sulfate and sodium borohydride, as well as the post-annealing process in air. The coercivity of the as-synthesized nanowires is above 684 Oe in the temperature range of 5 to 300 K, which is significantly higher than that of the bulk Fe (approximately 0.9 Oe). Through the annealing process in air, the coercivity and the exchange field are evidently improved. Both the coercivity and the exchange field increase with increasing annealing time ( T A ) and reach their maximum values of 1,042 and 78 Oe, respectively, at T A = 4 h. The magnetic measurements show that the effective anisotropy is increased with increasing the thickness of the α -Fe 2 O 3 by annealing. The large values of coercivity and exchange field, as well as the high surface area to volume ratio, may make the fluffy Fe@ α -Fe 2 O 3 core-shell nanowire a promising candidate for the applications of the magnetic drug delivery, electrochemical energy storage, gas sensors, photocatalysis, and so forth.
Transport and magnetotransport properties of cold-pressed CrO 2 powder
Publisher: Wiley
Date: 2005
Precipitate characterisation of an advanced high-strength low-alloy (HSLA) steel using atom probe tomography
Publisher: Elsevier BV
Date: 04-2007
Evaluation of carbon incorporation and strain of doped MgB2 superconductor by Raman spectroscopy
Publisher: Elsevier BV
Date: 02-2011
Tailoring Inorganic Halide Perovskite Photocatalysts toward Carbon Dioxide Reduction
Publisher: Wiley
Date: 16-03-2022
Abstract: In recent years, photocatalytic carbon dioxide reduction has emerged as an attractive strategy to settle the global warming and energy crisis by converting CO 2 into valuable chemicals utilizing solar energy. All‐inorganic halide perovskites (PVKs), as a class of promising light‐harvesting materials with outstanding optoelectronic properties and considerable stabilities, have received dramatic attention in the field of photocatalytic CO 2 reduction reaction (CO 2 RR). In this review, the recent progress of PVK catalysts for CO 2 RR is systematically summarized and evaluated according to the modification strategies and their mechanisms. The working principles of CO 2 RR are first introduced. The main strategies for improving the photoelectrochemical performance are then discussed and their recent developments are summarized. Finally, the current challenges, including instability, charge recombination, and insufficient active sites, and future research opportunities for further development are addressed.
MOF-derived carbon-encapsulated cobalt sulfides orostachys-like micro/nano-structures as advanced anode material for lithium ion batteries
Publisher: Elsevier BV
Date: 11-2018
Corrigendum to: “Phase redistribution in an in situ Mg-based bulk metallic glass composite during deformation in the supercooled liquid region” [Scripta Materialia 63 (2010) 556–559]
Publisher: Elsevier BV
Date: 10-2010
Enhanced photocatalytic performances and magnetic recovery capacity of visible-light-driven Z-scheme ZnFe 2 O 4 /AgBr/Ag photocatalyst
Publisher: Elsevier BV
Date: 05-2018
Enhanced flux pinning in a high-Tc superconducting film by a ferromagnetic buffer layer
Publisher: IOP Publishing
Date: 10-2001
Electrocatalysts Based on Transition Metal Borides and Borates for the Oxygen Evolution Reaction
Publisher: Wiley
Date: 10-07-2020
Abstract: Electrochemical water splitting is a clean and sustainable process for hydrogen production on a large scale as the electrical power required can be obtained from various renewable energy resources. The key challenge in electrochemical water splitting process is to develop low‐cost electrocatalysts with high catalytic activity for the hydrogen evolution reaction (HER) on the cathode and the oxygen evolution reaction (OER) on the anode. OER is the most important half‐reaction involved in water splitting, which has been extensively studied since the last century and a large amount of electrocatalysts including noble and non‐noble metal‐based materials have been developed. Among them, transition metal borides and borates (TMBs)‐based compounds with various structures have attracted increasing attention owing to their excellent OER performance. In recent years, many efforts have been devoted to exploring the OER mechanism of TMBs and to improving the OER activity and stability of TMBs. In this review, recent research progress made in TMBs as efficient electrocatalysts for OER is summarized. The chemical properties, synthetic methodologies, catalytic performance evaluation, and improvement strategy of TMBs as OER electrocatalysts are discussed. The electrochemistry fundamentals of OER are first introduced in brief, followed by a summary of the preparation and performance of TMBs‐based OER electrocatalysts. Finally, current challenges and future directions for TMBs‐based OER electrocatalysts are discussed.
Ultranarrow Bandgap Se‐Deficient Bimetallic Selenides for High Performance Alkali Metal‐Ion Batteries
Publisher: Wiley
Date: 12-07-2022
Abstract: Metal selenides have attracted significant attention as practically promising anode materials in alkali metal‐ion batteries because of their high theoretical capacity. However, a drawback is that these do not provide sufficient rate performance and cycle stability for large‐scale. Here, anion defect‐tuned ultra‐narrow bandgap bimetallic selenide nanoparticles anchored on honeycomb‐like N‐doped, porous carbon dominated by pyrrolic nitrogen is reported. This targeted defect chemistry and unique structure facilitate rapid diffusion of lithium‐potassium ions to provide increased pseudo‐capacitance that boosts electrochemical performance. It is demonstrated that in lithium‐ and potassium‐ion batteries (LIB and KIB), the composite exhibits high specific capacity, and excellent cycle stability with a reversible capacity of 937 mA h g −1 at 2 A g −1 for LIB and 304 mA h g −1 at 1 A g −1 for KIB following 1000 cycles, together with superior rate capability of, respectively, 499 mA h g –1 for LIB and 139 mA h g –1 for KIB at 10 A g –1 . A synergistic effect of the greater lithium otassium ion adsorption energy of the bimetallic selenide and N‐doped carbon boosts ion diffusion kinetics of the materials is confirmed. It is concluded that, these findings will be of immediate benefit to the practical development of alkali‐metal ion batteries.
In-situ synthesis of Ni–Co–S nanoparticles embedded in novel carbon bowknots and flowers with pseudocapacitance-boosted lithium ion storage
Publisher: IOP Publishing
Date: 12-02-2019
Abstract: We design a facile approach to prepare a bimetallic transition-metal-sulphide-based 3D hierarchically-ordered porous electrode based on bimetallic metal-organic frameworks (Ni-Co-MOFs) by using confinement growth and in-situ sulphurisation techniques. In the novel resulting architectures, Ni-Co-S nanoparticles are confined in bowknot-like and flower-like carbon networks and are mechanically isolated but electronically well-connected, where the carbon networks with a honeycomb-like feature facilitate electron transfer with uninterrupted conductive channels from all sides. Moreover, these hierarchically-ordered porous structures together with internal voids can accommodate the volume expansion of the embedded Ni-Co-S nanoparticles. The pseudocapacitive behaviours displayed in the NCS@CBs and NCS@CFs occupied a significant portion in the redox processes. Because of these merits, both the as-built bowknot and flower networks show excellent electrochemical properties for lithium storage with superior rate capability and robust cycling stability (994 mAh g
Incorporating plasmonic Au-nanoparticles into three-dimensionally ordered macroporous perovskite frameworks for efficient photocatalytic CO2 reduction
Publisher: Elsevier BV
Date: 02-2022
Magnetic, electrochemical and thermoelectric properties of P2-Nax (Co7/8 Sb1/8 )O2
Publisher: Elsevier BV
Date: 11-2017
Bimetallic metal-organic frameworks derived Ni-Co-Se@C hierarchical bundle-like nanostructures with high-rate pseudocapacitive lithium ion storage
Publisher: Elsevier BV
Date: 02-2019
Synthesis and characterization of a uranium oxide hydrate framework with Sr(ii ) ions: structural insights and mixed uranium valences
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1NJ05101F
Abstract: A uranium oxide hydrate framework with Sr( ii ) ions was synthesized hydrothermally and characterized.
Investigation of Self-assembled Monolayer by Atom Probe Microscopy
Publisher: Oxford University Press (OUP)
Date: 07-2009
DOI: 10.1017/S1431927609093003
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
Controllable synthesis of Ni1-x Cox MoO4 with tunable morphologies for high-performance asymmetric supercapacitors
Publisher: Elsevier BV
Date: 2021
Enhancement of Anomalous Hall Effect via Interfacial Scattering in Metal-Organic Semiconductor Fex (C60 )1− x Granular Films Near the Metal-Insulator Transition
Publisher: Wiley
Date: 24-06-2019
High-density, vertically aligned crystalline CrO2 nanorod arrays derived from chemical vapor deposition assisted by AAO templates
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B905308E
Abstract: Vertically aligned CrO(2) nanorods with an areal density as high as 1.2 x 10(10) cm(-2) were obtained via atmospheric pressure CVD assisted by AAO templates for the first time.
Cobalt and vanadium co-doped FeOOH nanoribbons: an iron-rich electrocatalyst for efficient water oxidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1QM00751C
Abstract: An iron-rich (Co,V)-FeOOH nanoribbon electrocatalyst is synthesized by a primary battery powered method for a highly efficient oxygen evolution reaction.
Recent Progress on Cesium Lead Halide Perovskites for Photodetection Applications
Publisher: American Chemical Society (ACS)
Date: 28-07-2019
Magnetotransport dependence on the field magnitude and direction in large area epitaxial graphene film on stretchable substrates
Publisher: AIP Publishing
Date: 04-03-2013
DOI: 10.1063/1.4794868
Abstract: We report the magnetotransport properties of large area graphene on stretchable polyethylene terephthalate substrates. At 2 K, weak localization of electrons introduced negative magnetoresistance at low field a transition to positive magnetoresistance followed as the external field increases. Our results suggest that weak localization contributes to Hall effect at low temperature. At room temperature, only classical Lorentz force contribution can be observed. Angular dependence of the external magnetic field on longitudinal and transverse resistivity is measured to test the interplay between weak localization and Lorentz force contribution. Quantitative simulations based on quantum interference theory produced excellent agreement with the experiments.
Electric Control of Exchange Bias at Room Temperature by Resistive Switching via Electrochemical Metallization
Publisher: American Chemical Society (ACS)
Date: 06-06-2022
Abstract: Electric field control of exchange bias (EB) plays an important role in spintronics due to its attractive merit of lower energy consumption. Here, we propose a novel method for electrically tunable EB at room temperature in a device with the stack of Si/SiO
Nanostructural Analysis of CMOS-MEMS-Based Digital Microphone for Performance Optimization
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2016
Solution Epitaxy of Halide Perovskite Thin Single Crystals for Stable Transistors
Publisher: American Chemical Society (ACS)
Date: 27-07-2021
Minimizing and Controlling Hydrogen for Highly Efficient Formamidinium Lead Triiodide Solar Cells
Publisher: American Chemical Society (ACS)
Date: 06-04-2022
DOI: 10.1021/JACS.2C00038
Abstract: Formamidinium lead triiodide (FAPbI
Syntheses and crystal structures of thorium(IV) and uranium(IV) tripodal metalloligands
Publisher: Elsevier BV
Date: 12-2017
Origin of Enhanced Nonradiative Carrier Recombination Induced by Oxygen in Hybrid Sn Perovskite
Publisher: American Chemical Society (ACS)
Date: 17-03-2023
Room-temperature ferromagnetism and the scaling relation between magnetization and average granule size in nanocrystalline Zn/ZnO core-shell structures prepared by sputtering
Publisher: IOP Publishing
Date: 16-03-2010
DOI: 10.1088/0957-4484/21/14/145705
Abstract: Ferromagnetism is found in nanocrystalline Zn/ZnO core-shell structures prepared by sputtering pure Zn with subsequent oxidation. The saturation magnetization (M(S)) of the passivated ZnO shells increases with decrease in average particle size (d). The Curie temperature of the s les is above 400 degrees C. It is found that the ferromagnetism has a close relationship with point defects in ZnO shells. The maximum magnetization is estimated to be 28 emu cm(-3) (i.e. 0.14 mu(B) per unit cell) at 300 K, which is over three orders of magnitude larger than that of undoped ZnO nanoparticles or nanorods (10(-3)-10(-2) emu cm(-3)). More importantly, there is a scaling relation of M(s) alpha 1/d(n) (n = 5.20 +/- 0.20) for s les with d <or= 76 nm despite substantial differences in the particle size and shape. The results suggest that defects at the interface of the Zn/ZnO heterostructure make the main magnetic contributions.
Magnetoelectric properties of MgB2 superconductor by SiC doping
Publisher: IEEE
Date: 12-2011
Facile One-Pot Synthesis of Bifunctional Heterodimers of Nanoparticles: A Conjugate of Quantum Dot and Magnetic Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 20-04-2004
DOI: 10.1021/JA0496423
Abstract: Sequential addition of sulfur and Cd(acac)2 into the colloid solution of FePt nanoparticles ( approximately 2.5 nm) under a reductive environment generates heterodimers of CdS and FePt with sizes of approximately 7 nm. The heterodimers exhibit both superparamagnetism and fluorescence, indicating that the discrete properties of the in idual parts of the dimers are preserved. This simple methodology may lead to the production of large quantities of various heterostructures with tailored properties on the nanoscale.
Comment on “Memory Effects in an Interacting Magnetic Nanoparticle System”
Publisher: American Physical Society (APS)
Date: 21-09-2004
A Simple Method to Prepare Uniform Co Nanoparticles
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2003
Room-temperature ferromagnetism in nanocrystalline Cu/Cu2O core-shell structures prepared by magnetron sputtering
Publisher: AIP Publishing
Date: 10-2013
DOI: 10.1063/1.4824037
Abstract: Cu/Cu2O core-shell nanoparticles with diameters around 8–9 nm have been fabricated by magnetron sputtering pure Cu targets with subsequent annealing in oxygen. Room-temperature ferromagnetism (FM) was observed in the s les annealed at 150 °C for 10–120 min. The maximum of saturated magnetization is as high as 19.8 emu/cc. The photoluminescence spectra show solid evidence that the FM originates from Cu vacancies in the Cu2O shell of the Cu/Cu2O core-shell nanoparticles. Furthermore, the FM can be modulated by the amount of Cu vacancies through the Cu/Cu2O core-shell interface engineering. Fundamentally, the FM can be understood by the charge-transfer ferromagnetism model based on Stoner theory.
Bi2Se3@C Rod-like Architecture with Outstanding Electrochemical Properties in Lithium/Potassium-Ion Batteries
Publisher: American Chemical Society (ACS)
Date: 05-11-2020
Graphene doping to enhance the flux pinning and supercurrent carrying ability of a magnesium diboride superconductor
Publisher: IOP Publishing
Date: 29-06-2010
Exchange bias in magnetic nanoparticles
Publisher: The Hong Kong University of Science and Technology Library
Date: 2004
TiO2–P3HT:PCBM photoelectrochemical tandem cells for solar-driven overall water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA09367E
Abstract: An organic–inorganic hybrid photoelectrochemical tandem cell has been developed for overall water splitting.
Thickness dependence of in-plane dielectric and ferroelectric properties of Ba0.7Sr0.3TiO3 thin films epitaxially grown on LaAlO3
Publisher: AIP Publishing
Date: 26-03-2007
DOI: 10.1063/1.2716865
Abstract: The authors have studied the effects of film thickness on the lattice strain and in-plane dielectric and ferroelectric properties of Ba0.7Sr0.3TiO3 thin films epitaxially grown on LaAlO3 (001) single crystal substrates. With increasing film thickness from 20to300nm, the in-plane lattice parameter (a) increased from 0.395to0.402nm while the out-of-plane lattice parameter (c) remained almost unchanged, which led to an increased a∕c ratio (tetragonality) changing from 0.998 to 1.012 and consequently resulted in a shift of Curie temperature from 306to360K associated with an increase of the in-plane remnant polarization and dielectric constant of the film.
Direct Synthesis of a Bimodal Nanosponge Based on FePt and ZnS
Publisher: Wiley
Date: 25-02-2005
Crystal Facet Effects on Nanomagnetism of Co3O4
Publisher: American Chemical Society (ACS)
Date: 30-04-2018
Abstract: The magnetic performance of nanomaterials depends on size, shape, and surface of the nanocrystals. Here, the exposed crystal planes of Co
Structure and magnetic properties of polycrystalline Fe3O4 films deposited by reactive sputtering at room temperature
Publisher: Wiley
Date: 03-2004
Charge Transport Properties of Methylammonium Lead Trihalide Hybrid Perovskite Bulk Single Crystals
Publisher: Wiley
Date: 12-11-2021
Intrinsic Ferromagnetism in the Diluted Magnetic SemiconductorCo :
Publisher:
American Physical Society (APS)
Date:
23-11-2016
Publisher: American Physical Society (APS)
Date: 23-11-2016
Highly Stable and Efficient Formamidinium‐Based 2D Ruddlesden–Popper Perovskite Solar Cells via Lattice Manipulation
Publisher: Wiley
Date: 13-09-2023
Large room-temperature spin-dependent tunneling magnetoresistance in polycrystalline Fe3 O4 films
Publisher: AIP Publishing
Date: 20-10-2003
DOI: 10.1063/1.1622440
Abstract: Polycrystalline Fe3O4 films have been prepared by reactive sputtering at room temperature. Transmission electron microscopy images show that the films consist of quite uniform Fe3O4 grains well separated by grain boundaries. It was found that the tunneling of spin-polarized electrons across the antiferromagnetic coupled grain boundaries dominates the transport properties of the films. Magnetoresistance (MR) {=[ρ(H)−ρ(0)]/ρ(0)} shows linear and quadratic magnetic-field dependence in the low-field range when the field is applied parallel and perpendicular to film plane, which is similar to the behaviors observed in the epitaxial Fe3O4 films consisting of a large fraction of antiferromagnetic antiphase domain boundaries. At 300 K, the size of the MR reaches −7.4% under a 50-kOe magnetic field, which is a very large MR for polycrystalline Fe3O4 films.
Atom Probe Tomography on Semiconductor Devices
Publisher: Wiley
Date: 06-04-2016
Ultrasonic-assisted polyaniline-multiwall carbon nanotube photocatalyst for efficient photodegradation of organic pollutants
Publisher: Elsevier BV
Date: 04-2022
Extraordinary Hall effect and universal scaling in Fex(ZnO)1–x granular thin films at room temperature
Publisher: AIP Publishing
Date: 05-01-2015
DOI: 10.1063/1.4905357
Abstract: On the benefit of the concept of the so-called diluted magnetic oxides, Fex(ZnO)1–x (x = 0.50–0.85) granular thin films with different thickness through 2D and 3D percolation region were prepared by ion beam assisted deposition. All s les are ferromagnetic at room-temperature due to the ferromagnetic nature of the Fe-doped ZnO matrix, which is quite different from the superparamagnetic behavior in the insulator-matrix based granular films. Along with decreasing thickness, the Hall coefficient RS is largely enhanced. The maximum RS reaches 4.27 × 10−7 m3/C in ∼2.8 nm Fe0.6(ZnO)0.4 granular film, which is nearly 9 times larger than the RS (4.64 × 10−8 m3/C) of the ∼50 nm Fe0.6(ZnO)0.4 s le. Meanwhile, the RS could maintain in a wide temperature region from 10 K to 300 K and the Hall sensitivity reaches ∼130 V/AT at room-temperature. The scaling exponential of n = 1.7 ± 0.1 in σxy∼σxxn is observed, fitting well with the recent developed universal scaling theory characterized by n = 1.6 in the dirty limit.
An ultraviolet self-initiated polymerized platform for specific recognition and elimination of caffeic acid based on the molecular imprinting technology
Publisher: Elsevier BV
Date: 06-2022
High-entropy catalysts for electrochemical water-electrolysis of hydrogen evolution and oxygen evolution reactions
Publisher: Springer Science and Business Media LLC
Date: 20-08-2023
Atomic-scale compositional mapping reveals Mg-rich amorphous calcium phosphate in human dental enamel
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-09-2016
Abstract: Atomic-scale study of human dental enamel reveals an intergranular amorphous phase thought to be responsible for tooth decay.
Electric-field-mediated magnetic properties of all-oxide CoFe2 O4 /La0.67 Sr0.33 MnO3 /Pb(Mg1/3 Nb2/3 )0.7 Ti0.3 O3 heterostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CP01374A
Abstract: The coercivity of the CFO/LSMO/PMN-PT heterostructures decreases ∼50%, making it possible to achieve electric-field-controlled magnetoresistance.
Investigation of uranium oxide hydrates with barium(ii ) ions: structural diversity, uranium valences and implications
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NJ01334K
Abstract: Two synthetic uranium oxide hydrates with Ba( ii ) ions, a 2D layered structure and a complex 3D structure, were synthesised hydrothermally and characterised.
Antiferromagnetic-coupling-induced magnetoresistance enhancement in Fe x (TiO2 )1-x films
Publisher: AIP Publishing
Date: 05-06-2006
DOI: 10.1063/1.2209880
Abstract: Fe-incorporated amorphous TiO2 films with different Fe volume fractions of 0.46⩽x⩽0.76 were deposited by cosputtering iron and Ti targets in an Ar+O2 mixture. X-ray diffraction and x-ray photoelectron spectroscopy analyses give a structure of nanosized Fe particles embedded in amorphous TiO2 matrix for the Fex(TiO2)1−x films. Magnetic measurements show antiferromagnetic coupling between nanoscaled Fe granules when x& .60. The magnetoresistance of Fe0.46(TiO2)0.54 is about −7.6% at room temperature, which increases dramatically with decreasing temperature below ∼100K and reaches −29.3% at 3K. This significant enhancement of magnetoresistance can be qualitatively explained by antiferromagnetic coupling between Fe granules.
Attractive-domain-wall-pinning controlled Sm-Co magnets overcome the coercivity-remanence trade-off
Publisher: Elsevier BV
Date: 02-2019
Facile synthesis of graphene oxide hybrids bridged by copper ions for increased conductivity
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TC30180J
Full tip imaging in atom probe tomography
Publisher: Elsevier BV
Date: 2013
DOI: 10.1016/J.ULTRAMIC.2012.08.014
Abstract: Atom probe tomography (APT) is capable of simultaneously revealing the chemical identities and three dimensional positions of in idual atoms within a needle-shaped specimen, but suffers from a limited field-of-view (FOV), i.e., only the core of the specimen is effectively detected. Therefore, the capacity to analyze the full tip is crucial and much desired in cases that the shell of the specimen is also the region of interest. In this paper, we demonstrate that, in the analysis of III-V nanowires epitaxially grown from a substrate, the presence of the flat substrate positioned only micrometers away from the analyzed tip apex alters the field distribution and ion trajectories, which provides extra image compression that allows for the analysis of the entire specimen. An array of experimental results, including field desorption maps, elemental distributions, and crystallographic features clearly demonstrate the fact that the whole tip has been imaged, which is confirmed by electrostatic simulations.
Hydrogen-Anion-Induced Carrier Recombination in MAPbI3 Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 28-10-2021
Ionic Liquid-Assisted Synthesis of Polyaniline/Gold Nanocomposite and Its Biocatalytic Application
Publisher: Springer Science and Business Media LLC
Date: 15-10-2008
DOI: 10.1007/S11671-008-9182-9
Abstract: In this report, a novel chemical synthesis of polyaniline/gold nanocomposite is explored using ionic liquid (IL) 1-Butyl-3-methylimidazolium hexafluorophosphate. The direct chemical synthesis of polyaniline/gold nanocomposite was initiated via the spontaneous oxidation of aniline by AuCl 4 − in IL. A nearly uniform dispersion of polyaniline/Au particles with a diameter of 450 ± 80 nm was produced by this method, which indicates that this method is more suitable for controlling particle dimensions. It was also found that the electrical conductivity of the polyaniline/gold nanocomposite was more than 100 times higher than that of the pure polyaniline nanoparticles. The polyaniline/gold nanocomposite displays superior function in the biocatalytic activation of microperoxidase-11 because of the high surface area of the assembly and the enhanced charge transport properties of the composite material. We also report the possible application of polyaniline/gold nanocomposite as a H 2 O 2 biosensor.
Electric control of exchange bias in Co/FeOx bilayer by resistive switching
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/1.5129506
Abstract: Two types of electric control of exchange bias (EB) by resistive switching (RS), i.e. conductive-filament-RS (type I) and interface-barrier-RS (type II) were observed in the Si/SiO2Ti/Pt/FeOx/Co/ITO multilayer devices, which were fabricated by magnetron sputtering. It is difficult for the type I device to control EB, which may be due to that the quantity of conductive filaments is not enough to modify the antiferromagnetic structure of FeOx near the Co/FeOx interface. However, the electric control of EB can be accomplished in the type II device. Compared with low-resistance-state (LRS), the exchange bias field (HE) increases a little but the coercivity (HC) increases significantly at high-resistance-state (HRS). We consider that the migration of the oxygen vacancies under different voltages is able to mediate the interfacial barrier height, leading to the bipolar RS effect and the change of EB as well. This provides a way for designing new types of spintronic devices based on electric control.
Structural and electronic properties of Eu- and Pd-doped ZnO
Publisher: Springer Science and Business Media LLC
Date: 21-04-2011
Abstract: Doping ZnO with rare earth and 4d transition elements is a popular technique to manipulate the optical properties of ZnO systems. These systems may also possess intrinsic ferromagnetism due to their magnetic moment borne on 4 f and 4 d electrons. In this work, the structural, electronic, and magnetic properties of Eu- and Pd-doped ZnO were investigated by the ab initio density functional theory methods based on generalized gradient approximation. The relative stability of incorporation sites of the doped elements in the ZnO host lattice was studied. The ground state properties, equilibrium bond lengths, and band structures of both the ZnO:Eu and ZnO:Pd systems were also investigated. The total and partial densities of electron states were also determined for both systems. It was found that in the ZnO:Eu system, ambient ferromagnetism can be induced by introducing Zn interstitial which leads to a carrier-mediated ferromagnetism while the ZnO:Pd system possesses no ferromagnetism. PACS 31.15.E-, 75.50.Pp, 75.30Hx
Solution-processed perovskite crystals for electronics: Moving forward
Publisher: Elsevier BV
Date: 06-2022
Exchange bias and the origin of magnetism in Mn-doped ZnO tetrapods
Publisher: AIP Publishing
Date: 27-09-2004
DOI: 10.1063/1.1795366
Abstract: Wurtzite-type ZnO tetrapod nanostructures were prepared by evaporating Zn metal under humid argon flow. After the fabrication, Mn was doped into ZnO nanostructures by diffusion at 600°C. The average concentration of Mn was determined to be 8.4mol% by x-ray fluorescence. X-ray diffraction patterns obtained from the doped and undoped s les are almost the same. High-resolution transmission electron microscopy observations reveal the existence of surface layers. Magnetic measurements show that the s le has a very large coercivity HC=5500Oe at 5.5K and a Curie temperature TC=43K, which may suggest that ferrimagnetic (Zn,Mn)Mn2O4 exists at the surface. Exchange bias is clearly observed below 22K. Exchange bias is attributed to the exchange interaction between ferrimagnetic (Zn,Mn)Mn2O4 and spin-glass-like (or antiferromagnetic) phase in manganese oxides.
Influence of oxygen partial pressure on the ferromagnetic properties of polycrystalline Cr-doped ZnO films
Publisher: IOP Publishing
Date: 10-2008
Synthesis and characterization of self-assembled c-axis oriented Bi2Sr3Co2Oy thin films by the sol–gel method
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0DT01731K
Abstract: Bi(2)Sr(3)Co(2)O(y) thin films are prepared on SrTiO(3) (100), (110) and (111) single crystal substrates using the sol-gel method. All the thin films are c-axis oriented regardless of the orientation of the substrate suggesting self-assembled c-axis orientation, and X-ray photoelectron spectroscopy results give evidence of coexistence of Co(3+) and Co(2+) ions in the derived films. Transmission electronic microscopy observations reveal that all s les are c-axis oriented with no obvious differences for different s les, and the c-axis lattice constant is determined as ~15 Å suggesting the misfit structure. A phenomenological thermodynamic phase diagram for self-assembled c-axis orientation is established for misfit cobaltate-based films using chemical solution deposition. All s les behave like semiconductors due to the coexistence of Co(3+)/Co(2+) ions, and the resistivity at 350 K is ~47, 39 and 17 mΩ cm for the thin films on SrTiO(3) (100), (110) and (111), respectively, whereas the Seebeck coefficient at 300 K is 97, 89 and 77 μV K(-1). The successful attainment of Bi(2)Sr(3)Co(2)O(y) thin films with self-assembled c-axis orientation will provide an effective prototype for investigation of growth mechanisms in complex oxide thin films with a misfit structure.
Interfacial Heterojunction-Engineered Fe2O3/CoFe-Layered Double Hydroxide Catalyst for the Electrocatalytic Oxygen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 07-07-2022
Interstitial Hydrogen Anions: A Cause of p-Type Conductivity in CsSnI3
Publisher: American Chemical Society (ACS)
Date: 25-08-2022
Heterogeneous nucleation of β-type precipitates on nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy
Publisher: Springer Science and Business Media LLC
Date: 08-06-2012
Abstract: Zirconium (Zr) is an important alloying element to Mg-Zn-based alloy system. In this paper, we report the formation of the β-type precipitates on the nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy during ageing at 180°C. Scanning transmission electron microscopy examinations revealed that the nanoscale Zr-rich [0001] α rods/laths are dominant in the Zr-rich core regions of the as-quenched s le after a solution treatment at 430°C. More significantly, these Zr-rich particles served as favourable sites for heterogeneous nucleation of the Zn-rich β-type phase during subsequent isothermal ageing at 180°C. This research provides a potential route to engineer precipitate microstructure for better strengthening effect in the Zr-containing Mg alloys.
Preparation of CoS2 supported flower-like NiFe layered double hydroxides nanospheres for high-performance supercapacitors
Publisher: Elsevier BV
Date: 11-2020
Zn-Ni-Co trimetallic carbonate hydroxide nanothorns branched on Cu(OH)2 nanorods array based on Cu foam for high-performance asymmetric supercapacitors
Publisher: Elsevier BV
Date: 10-2019
Bridging metal-ion induced vertical growth of MoS2 and overall fast electron transfer in (C,P)3N4-M (Ni2+, Co2+)-MoS2 electrocatalyst for efficient hydrogen evolution reaction
Publisher: Elsevier BV
Date: 09-2020
Enhanced photocatalytic activities of g-C3 N4 with large specific surface area via a facile one-step synthesis process
Publisher: Elsevier BV
Date: 12-2017
Controlled synthesis and characterization of 10 nm thick Al2O3 nanowires
Publisher: Elsevier BV
Date: 05-2009
Two-dimensional organic–inorganic hybrid Ruddlesden–Popper perovskite materials: preparation, enhanced stability, and applications in photodetection
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9SE01181A
Abstract: This review presents the progress of the synthesis, single crystal growth, enhanced stability, and applications as high-performance photodetectors.
CHAPTER 4 Halide Perovskites With Ambipolar Transport Properties for Transistor Applications
Publisher: The Royal Society of Chemistry
Date: 15-09-2021
DOI: 10.1039/9781788019279-00041
Abstract: Recently, halide perovskites have attracted considerable attention as newly emerging semiconducting materials because of their excellent optoelectronic properties, low cost, and facile processing. These features make halide perovskites attractive for use in high-efficiency energy-related devices and optoelectronic applications, including photovoltaic cells, photodetectors, light-emitting diodes, and lasers. Beyond their wide usage in various energy and optoelectronic technologies, these materials are also promising candidates in transistor applications because of their state-of-the-art carrier transporting features, particularly their ambipolar characteristics and high charge carrier mobilities. Field-effect transistors based on halide perovskites with various structures and dimensions have already been developed however, the low stability and ion migration issues of these materials are still major challenges that need to be addressed to realize their further applications and commercialization. This chapter mainly summarizes the recent progress of halide perovskite transistor devices, with an emphasis placed on detailed discussions of their ambipolar transport features. First, following a brief introduction of halide perovskites, the advantages of their charge transport behaviours for transistors are presented in detail. Thereafter, the development of halide perovskite transistors is systematically reviewed. The challenges and further opportunities of halide perovskite transistor applications are then discussed. Finally, a summary and outlook for transistors containing halide perovskites are outlined.
Development of < 110 > texture in copper thin films
Publisher: AIP Publishing
Date: 26-03-2002
DOI: 10.1063/1.1466518
Abstract: Apart from the scientific interest, texture development in copper thin films is of crucial importance to their applications as interconnects or corrosion resistant coating. We report here a dominant 〈110〉 texture of copper thin films—preferred for oxidation-resistant applications—deposited by direct current magnetron sputtering. Scanning electron microscopy shows that the copper films go through a transition from 〈111〉 columns to 〈110〉 hillocks as the deposition proceeds. Cross-sectional transmission electron microscopy (TEM) indicates that the 〈110〉 grains nucleate at boundaries of 〈111〉 grains. Further, we have proposed a stress-driven nucleation and growth model of 〈110〉 grains based on the x-ray diffraction characterization and the TEM observations.
Direct synthesis and strong cathodoluminescence of Al2O3 nanotubes
Publisher: Elsevier BV
Date: 04-2010
Giant exchange bias and the vertical shifts of hysteresis loops in gamma-Fe2O3-coated Fe nanoparticles
Publisher: AIP Publishing
Date: 16-04-2004
DOI: 10.1063/1.1687987
Abstract: We fabricated core/shell-structured Fe nanoparticles, in which the α-Fe core is about 5 nm in diameter and the γ-Fe2O3 shell is about 3 nm thick, and systematically studied their structural and magnetic properties. The magnetic hysteresis (M–H) loops, measured at low temperatures, after the particles were cooled from 350 K in a 50 kOe field, show significant shifts in both horizontal and vertical directions. It has been found that the exchange-bias field can be as large as 6.3 kOe at 2 K, and that the coercive field is also enhanced greatly in the field-cooled (FC) loops. The large exchange bias and vertical shifts of the FC loops at low temperatures may be ascribed to the frozen spins in the shells. A simple model is proposed to interpret the observations.
Construction of Z-scheme Cu2O/Cu/AgBr/Ag photocatalyst with enhanced photocatalytic activity and stability under visible light
Publisher: Elsevier BV
Date: 04-2017
Hydrogen adsorption capacity of adatoms on double carbon vacancies of graphene: A trend study from first principles
Publisher: American Physical Society (APS)
Date: 03-01-2013
Anionic surfactant anchoring enables 23.4% efficient and stable perovskite solar cells
Publisher: Springer Science and Business Media LLC
Date: 14-10-2022
Microstructure and enhanced in-plane ferroelectricity of Ba0.7Sr0.3TiO3 thin films grown on MgAl2O4 (001) single-crystal substrate
Publisher: AIP Publishing
Date: 04-12-2006
DOI: 10.1063/1.2402900
Abstract: The microstructure and in-plane dielectric and ferroelectric properties of highly oriented Ba0.7Sr0.3TiO3 (BST) thin film grown on MgAl2O4 (001) single-crystal substrate through pulsed laser deposition were investigated. X-ray diffraction measurements indicated that BST had a distorted lattice with a tetragonality a∕c=1.012. The cross-sectional observation under transmission electron microscope revealed that, while most of BST grains grew epitaxially on MgAl2O4, the film also contained a noticeable amount of misoriented grains and dislocations. The electrical measurements indicated that the film had a shifted Curie temperature (TC=78°C) and an enhanced in-plane ferroelectricity (remnant polarization Pr=7.1μC∕cm2) when compared with BST ceramic (TC≈33°C and Pr≈0).
Quantitative Determination of How Growth Conditions Affect the 3D Composition of InGaAs Nanowires
Publisher: Oxford University Press (OUP)
Date: 18-02-2019
DOI: 10.1017/S1431927619000114
Abstract: Covering a broad optical spectrum, ternary In x Ga 1− x As nanowires, grown by bottom-up methods, have been receiving increasing attention due to the tunability of the bandgap via In composition modulation. However, inadequate knowledge about the correlation between growth and properties restricts our ability to take advantage of this phenomenon for optoelectronic applications. Here, three different InGaAs nanowires were grown under different experimental conditions and atom probe tomography was used to quantify their composition, allowing the direct observation of the nanowire composition associated with the different growth conditions.
Mechanical magnetoresistance in broken cold-pressed CrO2 powder sample
Publisher: Elsevier BV
Date: 07-2006
In situ formation of crystalline flakes in Mg-based metallic glass composites by controlled inoculation
Publisher: Elsevier BV
Date: 12-2011
Inverse and normal tunneling magnetoresistance effects in FeCoGd/FeCo/AlO/FeCo multilayers
Publisher: IOP Publishing
Date: 2010
Quantifying the nucleation effect of correlated matrix grains in sintered Nd-Fe-B permanent magnets
Publisher: Elsevier BV
Date: 03-2020
Facile Fabrication of Hybrid Perovskite Single-Crystalline Photocathode for Photoelectrochemical Water Splitting
Publisher: Wiley
Date: 09-04-2021
Abstract: Recently, beyond various optoelectronic devices, lead halide perovskites have emerged as promising candidates for high‐performance photocatalysts owing to their excellent optoelectronic properties. However, most previous works on perovskite photocatalysts mainly used the forms of nanocrystals that need the perovskite‐saturated electrolyte or polycrystalline thin films that still suffer from the instability in water and low performance. Herein, the synthesis of high‐quality hybrid perovskite single crystals and their implementation as photocathodes for water splitting with a simple device structure are reported on. Optimized perovskite crystals exhibit a good water splitting photocurrent density of −0.51 mA cm −2 at 0 V versus reversible hydrogen electrode (RHE) under visible light illumination. Moreover, such devices as the p‐type photocathodes show improved stability, exhibiting no obvious decrease over 600 s. This work highlights the great potential of hybrid perovskite single crystals for photocatalyst applications in aqueous solution.
One-pot solution synthesis of 2D-3D mixed-dimensional perovskite crystalline lateral heterostructures
Publisher: Elsevier BV
Date: 06-2023
Nanorod-Like Nanocrystalline CsSnI3 and CNTs Composite Thin Film-Based Hybrid Photodetector
Publisher: Research Square Platform LLC
Date: 27-04-2022
DOI: 10.21203/RS.3.RS-1589528/V1
Abstract: An experimental detail on the morphology engineering and characterizations of the all-inorganic Sn-based perovskite (here CsSnI3) thin films and their application in photodetectors are presented. In particular, we demonstrated that the chlorobenzene anti-solvent treatment during thin film spin-coating could effectively optimize the morphology properties of the obtained CsSnI3 thin film. SEM and AFM measurements showed the uniform thin film with nanorod-like nanocrystalline morphology. In addition, EDS and XPS measurements confirmed the low level of oxidation of the thin film, indicating good ambient stability. A planar photodetector was also made with the prepared thin film, and electrical characteristics were taken. The dark current and photocurrent were found in the range of 10-9 A and 10-7 A, respectively, with an on/off ratio of 102. The photoresponsivity was 10-5 AW-1. A further experiment was conducted to make composite thin films between CsSnI3 and CNTs for additional morphological engineering. The SEM measurement and Raman mapping manifested the nanonet-like morphology of the composite thin film. The quenching of the PL curve indicated the efficient photo-generated carrier extraction from the CsSnI3 matrix to CNTs. The absorption spectra also showed enhanced absorption ability of the prepared composite thin film. A hybrid photodetector made from the composite thin film showed dark current and photocurrent in the range of 10-6 A and 10-4 A, respectively, with an on/off ratio of 102. The photoresponsivity was 10-2 AW-1. Due to the combination of the CNTs with CsSnI3, The photoresponsivity increased 1000 times. At the same time, the hysteresis of the hybrid photodetector also reduced significantly compared to pristine CsSnI3-based photodetector.
Self-assembly of a unique 3d/4f heterometallic square prismatic box-like coordination cage
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6DT01651K
Abstract: A unique, slightly distorted square prismatic, box-like coordination cage of type [Cu 6 Dy 8 L 8 (MeOH) 8 (H 2 O) 6 ](NO 3 ) 12 · χ solvent has been synthesized via the supramolecular assembly between a non-centrosymmetric Dy( iii ) metalloligand and Cu( ii ) nitrate.
Atom Probe Microscopy of Self-Assembled Monolayers: Preliminary Results
Publisher: American Chemical Society (ACS)
Date: 18-03-2010
DOI: 10.1021/LA904459K
Abstract: We have achieved three-dimensional imaging of decanethiol self-assembled monolayers (SAMs) on metal surfaces by atom probe tomography (APT). The present Letter provides preliminary results on Ni [001] and Au [111], shows the analytical potential of APT analysis of SAMs, and details developments in specimen preparation and in data-treatment methodologies. Importantly, the investigation of the mass spectra from analysis of the SAMs revealed no combination of sulfur and hydrogen at the interface between the metal substrates and the organic materials, potentially providing insight about the bonding of the thiols on the substrate.
Stress/strain induced flux pinning in highly dense MgB2 bulks
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2009
Inferring structural variant cancer cell fraction
Publisher: Springer Science and Business Media LLC
Date: 05-02-2020
DOI: 10.1038/S41467-020-14351-8
Abstract: We present SVclone, a computational method for inferring the cancer cell fraction of structural variant (SV) breakpoints from whole-genome sequencing data. SVclone accurately determines the variant allele frequencies of both SV breakends, then simultaneously estimates the cancer cell fraction and SV copy number. We assess performance using in silico mixtures of real s les, at known proportions, created from two clonal metastases from the same patient. We find that SVclone’s performance is comparable to single-nucleotide variant-based methods, despite having an order of magnitude fewer data points. As part of the Pan-Cancer Analysis of Whole Genomes (PCAWG) consortium, which aggregated whole-genome sequencing data from 2658 cancers across 38 tumour types, we use SVclone to reveal a subset of liver, ovarian and pancreatic cancers with subclonally enriched copy-number neutral rearrangements that show decreased overall survival. SVclone enables improved characterisation of SV intra-tumour heterogeneity.
Giant hot electron thermalization via stacking of graphene layers
Publisher: Elsevier BV
Date: 2023
2D Metal Organic Framework Nanosheet: A Universal Platform Promoting Highly Efficient Visible-Light-Induced Hydrogen Production
Publisher: Wiley
Date: 04-02-2019
Water-based asymmetric supercapacitors with 2.5 V wide potential and high energy density based on Na0.6CoO2 nanoarray formed via electrochemical oxidation
Publisher: Elsevier BV
Date: 04-2022
Diameter dependence of the giant magnetoimpedance in hard-drawn CoFeSiB amorphous wires
Publisher: AIP Publishing
Date: 13-05-2002
DOI: 10.1063/1.1448303
Abstract: The as cast CoFeSiB amorphous wire with 135 μm was drawn out to wires with diameters of 84, 64, and 40 μm, respectively. The magnetoimpedance of the hard-drawn wires were investigated in comparison with the as cast one. For the hard-drawn wire of diameter 64 μm, the magnetoimpedance ratio ΔZ/Z0 can reach 269.9%. There is a transform of the domain structure from the inner core longitudinal to the circular in hard-drawn wires compared with the as cast one. The frequency dependence of the magnetoimpedance in longitudinal and transverse cases show that both circumferential and longitudinal axial anisotropies may depend on the radial distance from the axis of the wire.
Ti3 C2 Tx MXene based hybrid electrodes for wearable supercapacitors with varied deformation capabilities
Publisher: Elsevier BV
Date: 02-2022
Competition Pathways of Energy Relaxation of Hot Electrons through Coupling with Optical, Surface, and Acoustic Phonons
Publisher: American Chemical Society (ACS)
Date: 19-01-2023
Socrates: Identification of genomic rearrangements in tumour genomes by re-aligning soft clipped reads
Publisher: Oxford University Press (OUP)
Date: 02-01-2014
DOI: 10.1093/BIOINFORMATICS/BTT767
Abstract: Motivation: Methods for detecting somatic genome rearrangements in tumours using next-generation sequencing are vital in cancer genomics. Available algorithms use one or more sources of evidence, such as read depth, paired-end reads or split reads to predict structural variants. However, the problem remains challenging due to the significant computational burden and high false-positive or false-negative rates. Results: In this article, we present Socrates (SOft Clip re-alignment To idEntify Structural variants), a highly efficient and effective method for detecting genomic rearrangements in tumours that uses only split-read data. Socrates has single-nucleotide resolution, identifies micro-homologies and untemplated sequence at break points, has high sensitivity and high specificity and takes advantage of parallelism for efficient use of resources. We demonstrate using simulated and real data that Socrates performs well compared with a number of existing structural variant detection tools. Availability and implementation: Socrates is released as open source and available from bioinf.wehi.edu.au/socrates. Contact: papenfuss@wehi.edu.au Supplementary information: Supplementary data are available at Bioinformatics online.
The origin of the non-monotonic field dependence of the blocking temperature in magnetic nanoparticles
Publisher: IOP Publishing
Date: 16-06-2006
DOI: 10.1088/0953-8984/18/26/010
Abstract: The dependence of the peak temperature (T(P)) of the zero-field-cooled (ZFC) magnetization curves on the field in a magnetic nanoparticle system was studied using a diluted magnetic fluid composed of FePt nanoparticles. We found that the peak temperature increases with increasing applied field below 3 kOe it then decreases when the applied field is increased further. We attribute the non-monotonic field dependence of the peak temperature to the anisotropic energy barrier distribution of the particles and to the slow decrease of high-field magnetization above the blocking temperature. Numerical simulations, based on magnetic dynamics, agree well with our experimental results.
Phase redistribution in an in situ Mg-based bulk metallic glass composite during deformation in the supercooled liquid region
Publisher: Elsevier BV
Date: 09-2010
Surface plasmon resonance enhanced visible-light-driven photocatalytic activity in Cu nanoparticles covered Cu2O microspheres for degrading organic pollutants
Publisher: Elsevier BV
Date: 03-2016
Visible-Light-Triggered Reactive-Oxygen-Species-Mediated Antibacterial Activity of Peroxidase-Mimic CuO Nanorods
Publisher: American Chemical Society (ACS)
Date: 06-03-2018
Cr2 O3 surface layer and exchange bias in an acicular CrO2 particle
Publisher: AIP Publishing
Date: 02-02-2004
DOI: 10.1063/1.1644919
Interfacial effects on the microstructures and magnetoresistance of Ni80Fe20/P3HT/Fe organic spin valves
Publisher: Elsevier BV
Date: 11-2018
Metallic MoN ultrathin nanosheets boosting high performance photocatalytic H2 production
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA09358J
Abstract: MoN nanosheets for the first time serve as a highly active co-catalyst to greatly enhance the photocatalytic H 2 production of TiO 2 .
Bimetal-organic framework derived Cu(NiCo)2 S4 /Ni3 S4 electrode material with hierarchical hollow heterostructure for high performance energy storage
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.JCIS.2020.01.049
Abstract: Rational design of electrical active materials with high performance for energy storage and conversion is of great significance. Herein, Cu(NiCo)
Auger scattering dynamic of photo-excited hot carriers in nano-graphite film
Publisher: AIP Publishing
Date: 31-10-2022
DOI: 10.1063/5.0116720
Abstract: Charge carrier scattering channels in graphite bridging its valence and conduction band offer an efficient Auger recombination dynamic to promote low energy charge carriers to higher energy states. It is of importance to answer the question whether a large number of charge carriers can be promoted to higher energy states to enhance the quantum efficiency of photodetectors. Here, we present an experimental demonstration of an effective Auger recombination process in the photo-excited nano-graphite film. The time-resolved hot carrier thermalization was analyzed based on the energy dissipation via the Auger scattering channels. We split the Auger recombination occurrence centered at 0.40 eV energy state into scattering and recombination parts, for characterizing the scattering rate in the conduction band and the recombination rate toward the valence band. The scattering time with respect to the energy state was extracted as 8 ps · eV−1, while the recombination time with respect to the energy state was extracted as 24 ps · eV−1. Our study indicates a 300 fs delay between the hot carrier recombination and generation, leading to a 105 ps−1 · cm−3 Auger scattering efficiency. The observed duration for the Auger recombination to generate hot carriers is prolonged for 1 ps, due to the hot carriers energy relaxation bottleneck with optical-phonons in the nano-graphite. The presented analytic expression gives valuable insights into the Auger recombination dynamic to estimate its most efficient energy regime for mid-infrared photodetection.
Memory effects in a nanoparticle system: Low-field magnetization and ac susceptibility measurements
Publisher: American Physical Society (APS)
Date: 08-07-2005
Large coercivity and exchange bias in Fe1-delta(FeO)(delta) (x)(TiO2)(1-x) granular films
Publisher: AIP Publishing
Date: 13-05-2013
DOI: 10.1063/1.4804426
Abstract: [Fe1−δ(FeO)δ]x(TiO2)1−x (0≤δ≤0.91, 0.34≤x≤0.54) granular films were fabricated by magnetron sputtering. Large coercivity (HC = 10.5 kOe) and exchange-bias-field (HE = 6.5 kOe) at 5 K were found in the film with δ=0.84 and x = 0.48. AC susceptibility measurements exhibit a frequency (f) dependent peak Tf in the in-phase susceptibility curve. The fitting of the relation of Tf vs f with both the Vogel-Fulcher law and critical slowing down theory indicate that the evident enhancement of the HC and HE can be qualitatively ascribed to the existence of cluster-spin glass state. The results may help to deeply understand the origin of exchange bias and related effects.
Recent advances in radiation detection technologies enabled by metal-halide perovskites
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1MA00569C
Abstract: Perovskite halides hold great potential for high-energy radiation detection. Recent advancements in detecting alpha-, beta-, X-, and gamma-rays by perovskite halides are reviewed and an outlook on the device performance optimization is provided.
Quantitative dopant distributions in GaAs nanowires using atom probe tomography
Publisher: Elsevier BV
Date: 09-2013
DOI: 10.1016/J.ULTRAMIC.2013.02.012
Abstract: Controllable doping of semiconductor nanowires is critical to realize their proposed applications, however precise and reliable characterization of dopant distributions remains challenging. In this article, we demonstrate an atomic-resolution three-dimensional elemental mapping of pristine semiconductor nanowires on growth substrates by using atom probe tomography to tackle this major challenge. This highly transferrable method is able to analyze the full diameter of a nanowire, with a depth resolution better than 0.17 nm thanks to an advanced reconstruction method exploiting the specimen's crystallography, and an enhanced chemical sensitivity of better than 8-fold increase in the signal-to-noise ratio.
On the roles of graphene oxide doping for enhanced supercurrent in MgB2 based superconductors
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR00415A
Abstract: Advanced microscopy techniques and computational simulation to reveal the atomic-scale mechanisms for the highest ever recorded enhancement of supercurrent in MgB 2 -based superconductors.
In situ self-assembly of thin ZnO nanoplatelets into hierarchical mesocrystal Microtubules with surface grafting of nanorods: A general strategy towards hollow mesocrystal structures
Publisher: Wiley
Date: 18-01-2008
Thickness dependence of magnetic and magneto-transport properties of polycrystalline Fe3 O4 films prepared by reactive sputtering at room temperature
Publisher: IOP Publishing
Date: 20-11-2003
Extracting anisotropy energy barrier distributions of nanomagnetic systems from magnetization/susceptibility measurements
Publisher: Elsevier BV
Date: 05-2009
On the universality of Suzuki segregation in binary Mg alloys from first principles
Publisher: Elsevier BV
Date: 2015
Tailoring the electrolyte and cathode properties for optimizing the performance of symmetrical solid oxide fuel cells fabricated by one-step co-sintering method
Publisher: Informa UK Limited
Date: 03-04-2022
Tunable electrical and magnetic properties of half-metallic ZnxFe3−xO4 from first principles
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CP22463H
Abstract: The electrical and magnetic properties of Zn-doped Fe(3)O(4) at different doping concentrations of Zn have been investigated using a density functional method with generalized-gradient approximation corrected for on-site Coulombic interactions. The electronic structure calculation predicts that Zn(x)Fe(3-x)O(4) (0 ≤x≤ 0.875) is half-metallic with a full spin polarization. The hopping carrier concentration of Zn(x)Fe(3-x)O(4) decreases with increasing x, which indicates a distinct increase in the resistivity. The saturation magnetization of Zn(x)Fe(3-x)O(4) increases evidently with increasing x from x = 0 to x = 0.75 (i.e. from 4.0 to 8.3 μ(B)/f.u.) and then decreases rapidly to zero at x = 1. The robust half-metallicity, large tunability of electrical and magnetic properties of a Zn doped Fe(3)O(4) system make it a promising functional material for spintronic applications.
Nanorod-like nanocrystalline CsSnI3 and CNT composite thin film–based hybrid photodetector
Publisher: Springer Science and Business Media LLC
Date: 12-07-2022
DOI: 10.1007/S42247-022-00394-8
Abstract: An experimental detail on the morphology engineering and characterizations of the all-inorganic Sn-based perovskite (here CsSnI 3 ) thin films and their application in photodetectors are presented. In particular, we demonstrated that the chlorobenzene anti-solvent treatment during thin-film spin coating could effectively optimize the morphology properties of the obtained CsSnI 3 thin film. SEM and AFM measurements showed the uniform thin film with nanorod-like nanocrystalline morphology. In addition, EDS and XPS measurements confirmed the low level of oxidation of the thin film, indicating good ambient stability. A planar photodetector was also made with the prepared thin film, and electrical characteristics were taken. The dark current and photocurrent were found in the range of 10 −9 A and 10 −7 A, respectively, with an on/off ratio of 10 2 . The photoresponsivity was 10 −5 AW −1 . A further experiment was conducted to make composite thin films between CsSnI 3 and CNTs for additional morphological engineering. The SEM measurement and Raman mapping manifested the nanonet-like morphology of the composite thin film. The quenching of the photoluminescence curve indicated the efficient photo-generated carrier extraction from the CsSnI 3 matrix to CNTs. The absorption spectra also showed enhanced absorption ability of the prepared composite thin film. A hybrid photodetector made from the composite thin film showed dark current and photocurrent in the range of 10 −6 A and 10 −4 A, respectively, with an on/off ratio of 10 2 . The photoresponsivity was 10 −2 AW −1 . Due to the combination of the CNTs with CsSnI 3 , the photoresponsivity increased 1000 times. At the same time, the hysteresis of the hybrid photodetector also reduced significantly compared to the pristine CsSnI 3 -based photodetector.
Post-imprinting modification based on multilevel mesoporous silica for highly sensitive molecularly imprinted fluorescent sensors
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9AN01503E
Abstract: p-MIFPs based on multilevel mesoporous silica exhibited improved sensitivity as compared to those prepared by the doping method due to their well-maintained fluorescence intensity and low background.
Characterization of Ni-base superalloys on the atomic scale by atom probe tomography and spherical-aberration corrected analytical electron microscopy techniques
Publisher: Oxford University Press (OUP)
Date: 31-07-2006
DOI: 10.1017/S1431927606065329
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006
Understanding the role of facets and twin defects in the optical performance of GaAs nanowires for laser applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NH00079A
Abstract: GaAs nanowires are regarded as promising building blocks of future optoelectronic devices.
Uranyl oxide hydrate frameworks with lanthanide ions
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0DT02944K
Abstract: The first two uranyl oxide hydrate frameworks incorporating lanthanide ions (Ln = Eu 3+ /Gd 3+ ) have been synthesized hydrothermally and characterized.
Microstructural and texture evolution of strip cast Nd-Fe-B flake
Publisher: American Chemical Society (ACS)
Date: 10-11-2017
MOF derived Ni-Co-S nanosheets on electrochemically activated carbon cloth via an etching/ion exchange method for wearable hybrid supercapacitors
Publisher: Elsevier BV
Date: 09-2019
Full Electric Control of Exchange Bias at Room Temperature by Resistive Switching
Publisher: Wiley
Date: 11-06-2018
Abstract: Electric control of exchange bias (EB) is of vital importance in energy-efficient spintronics. Although many attempts have been made during the past decade, each has its own limitations for operation and thus falls short of full direct and reversible electrical control of EB at room temperature. Here, a novel approach is proposed by virtue of unipolar resistive switching to accomplish this task in a Si/SiO
Low temperature spin-glass-like phases in magnetic nano-granular composites
Publisher: American Scientific Publishers
Date: 09-2012
Characterization of Nano-Scale Particles in Hot-Rolled, High Strength Low Alloy Steels (HSLA)
Publisher: Trans Tech Publications Ltd.
Date: 02-10-2007
The Development of Point-of-Care Plasmonic-based Biosensor for Early Detection of COVID-19 Virus
Publisher: IEEE
Date: 15-11-2021
Unexpected assembly of a unique cyano-bridged three-dimensional CU3Cr2 ferromagnet
Publisher: American Chemical Society (ACS)
Date: 11-2001
DOI: 10.1021/JA016656P
THE BEHAVIOR OF GALLIUM CONFINED IN CARBON NANOTUBES DURING HEATING AND COOLING
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2008
DOI: 10.1142/S1793604708000101
Abstract: The thermal expansion of gallium ( Ga ) encapsulated in carbon nanotubes has been studied. It is demonstrated that the volumetric expansion and contraction of the Ga confined in the carbon nanotubes display a linear relationship with temperature. While the level of the tip of the Ga column changes linearly with temperature, it returns to its previous position, without any hysteresis, when reheated or cooled to the original temperature, provided the Ga has not frozen and electron-beam irradiation is minimized. It is shown that electron beam irradiation can cause shrinkage in carbon-nanotube diameter, and that a high-intensity electron beam can also induce the formation of new carbon shells inside the carbon nanotubes. Upon freezing, the solid Ga has two unique orientation relationships with the carbon nanotubes.
Synthesis of mesoporous LaPO4 nanostructures with controllable morphologies
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B902381J
Three-Dimensional Smart Catalyst Electrode for Oxygen Evolution Reaction
Publisher: Wiley
Date: 14-07-2015
Fabrication of MOFs’ derivatives assisted perovskite nanocrystal on TiO2 photoanode for photoelectrochemical glycerol oxidation with simultaneous hydrogen production
Publisher: Elsevier BV
Date: 11-2021
Characterization of Iron Core–Gold Shell Nanoparticles for Anti-Cancer Treatments: Chemical and Structural Transformations During Storage and Use
Publisher: MDPI AG
Date: 17-12-2018
DOI: 10.3390/MA11122572
Abstract: Finding a cancer-selective drug that avoids damaging healthy cells and organs is a holy grail in medical research. In our previous studies, gold-coated iron (Fe@Au) nanoparticles showed cancer selective anti-cancer properties in vitro and in vivo but were found to gradually lose that activity with storage or "ageing.” To determine the reasons for this diminished anti-cancer activity, we examined Fe@Au nanoparticles at different preparation and storage stages by means of transmission electron microscopy combined with and energy-dispersive X-ray spectroscopy, along with X-ray diffraction analysis and cell viability tests. We found that dried and reconstituted Fe@Au nanoparticles, or Fe@Au nanoparticles within cells, decompose into irregular fragments of γ-F2O3 and agglomerated gold clumps. These changes cause the loss of the particles’ anti-cancer effects. However, we identified that the anti-cancer properties of Fe@Au nanoparticles can be well preserved under argon or, better still, liquid nitrogen storage for six months and at least one year, respectively.
On the metallic bonding of GaN-based vertical light-emitting diode
Publisher: Elsevier BV
Date: 06-2017
Intragranular glass/crystal conjugated particles in strip cast Nd-Fe-B flakes
Publisher: Elsevier BV
Date: 02-2020
Coercivity degradation caused by inhomogeneous grain boundaries in sintered Nd-Fe-B permanent magnets
Publisher: American Physical Society (APS)
Date: 14-05-2018
Valence excitations and dopant distribution of al doped zno nanowires analyzed by electron energy loss spectroscopy
Publisher: American Scientific Publishers
Date: 11-2011
Abstract: Valence electron energy loss spectroscopy (VEELS) with scanning transmission electron microscopy (STEM) has been employed to probe the valence excitations and dopant distribution of Al doped ZnO nanowires. The results reveal that while the typical Al concentration is on the order of 1020 1/cm3, Al tends to segregate at the surface leading to an Al-rich sheath. In VEEL spectra, O-2p, Zn-3d, Al-3p, O-2s, interband transitions as well as bulk plasmon have been identified. The bulk plasmon peak is blue-shifted, and the projected interband transition decreases from 2.14 to 1.88 eV as the doping concentration increases from 0.83 x 10(20) to 2.18 x 10(20) 1/cm3.
[U(H2O)2]{[(UO2)10O10(OH)2][(UO4)(H2O)2]}: A Mixed-Valence Uranium Oxide Hydrate Framework
Publisher: American Chemical Society (ACS)
Date: 21-08-2020
Hydrothermal Syntheses of Uranium Oxide Hydrate Materials with Sm(III) Ions: pH-Driven Diversities in Structures and Morphologies and Sm-Doped Porous Uranium Oxides Derived from Their Thermal Decompos
Publisher: American Chemical Society (ACS)
Date: 27-08-2021
Single Crystal Kinked ZnO [001] and [110] Nanowires: Synthesis, Characterization, and Growth/Kinking Mechanism
Publisher: American Chemical Society (ACS)
Date: 02-05-2012
DOI: 10.1021/CG300328C
Transporting holes stably under iodide invasion in efficient perovskite solar cells
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-09-2022
Abstract: Highly efficient halide perovskite solar cells generally rely on lithium-doped organic hole transporting layers that are thermally and chemically unstable, in part because of migration of iodide anions from the perovskite layer. We report a solution strategy to stabilize the hole transport in organic layers by ionic coupling positive polymer radicals and molecular anions through an ion-exchange process. The target layer exhibited a hole conductivity that was 80 times higher than that of the conventional lithium-doped layer. Moreover, after extreme iodide invasion caused by light-soaking at 85°C for 200 hours, the target layer maintained high hole conductivity and well-matched band alignment. This ion-exchange strategy enabled fabrication of perovskite solar cells with a certified power conversion efficiency of 23.9% that maintained 92% under standard illumination at 85°C after 1000 hours.
Carbon Nanomaterials for Halide Perovskites‐Based Hybrid Photodetectors
Publisher: Wiley
Date: 07-10-2020
Abstract: Over the last few years, metal halide perovskites have established themselves as important materials in the field of optoelectronics. After their first application in photovoltaics, they have been successfully used in other optoelectronic devices, especially photodetectors, owing to their unparalleled optical and electronic properties. Notably, because of their unique optical and electronic properties and small physical dimensions, various carbon nanomaterials have emerged as alternatives for next‐generation optoelectronic devices, and they have also been combined with other materials to realize optimal optoelectronic performance. Some implementations of hybrid photodetectors combining metal halide perovskites with carbon nanomaterials have been reported. Here, it is presented a comprehensive review of the recent advancements in the application of carbon nanomaterials in metal halide perovskite photodetectors, with particular focus on the possible working mechanisms behind the significant enhancement of their performance. First, a brief introduction to the fundamentals of photodetection devices is presented, followed by a short discussion of the intrinsic characteristics of metal halide perovskites and carbon nanomaterials. Detailed descriptions of the operation mechanisms, the evolution of different device structures, and their optoelectronic performance are then given. Finally, the potential challenges and future perspectives for the development of high‐performance stable photodetectors based on these materials are outlined.
Atomic-scale observation of parallel development of super elasticity and reversible plasticity in GaAs nanowires
Publisher: AIP Publishing
Date: 13-01-2014
DOI: 10.1063/1.4861846
Abstract: We report the atomic-scale observation of parallel development of super elasticity and reversible dislocation-based plasticity from an early stage of bending deformation until fracture in GaAs nanowires. While this phenomenon is in sharp contrast to the textbook knowledge, it is expected to occur widely in nanostructures. This work indicates that the super recoverable deformation in nanomaterials is not simple elastic or reversible plastic deformation in nature, but the coupling of both.
A three-dimensional and porous bi-nanospheres electrocatalytic system constructed by in situ generation of Ru nanoclusters inside and outside polydopamine nanoparticles for highly efficient hydrogen e
Publisher: Elsevier BV
Date: 02-2020
Light-controlled convergence of photogenerated carriers and reactants to boost photocatalytic performance
Publisher: Elsevier BV
Date: 08-2021
Optical single-sideband modulation based on silicon-on-insulator coupled-resonator optical waveguides
Publisher: SPIE-Intl Soc Optical Eng
Date: 20-10-2016
Localization of the Optical Phonon Modes in Boron Nitride Nanotubes: Mixing Effect of 10B Isotopes and Vacancies
Publisher: American Chemical Society (ACS)
Date: 18-07-2022
Microstructural evolution of spinodally formed Fe35 Ni15 Mn25 Al25
Publisher: Elsevier BV
Date: 11-2009
Trace of transition metal dopants induced charge redistribution on the MOF-derived CoP/NC electrocatalysts to improve water-splitting efficiency
Publisher: Elsevier BV
Date: 11-2022
NiO thin film with an extremely high index $$(7 \overline{1 } 4)$$ on r-plane sapphire substrate
Publisher: Springer Science and Business Media LLC
Date: 05-09-2023
Atomic-Level Insights into the Edge Active ReS2 Ultrathin Nanosheets for High-Efficiency Light-to-Hydrogen Conversion
Publisher: American Chemical Society (ACS)
Date: 12-10-2020
Carbon-Coating Layers on Boron Generated High Critical Current Density in MgB2 Superconductor
Publisher: American Chemical Society (ACS)
Date: 23-01-2020
Abstract: Boron particles with a homogeneous carbon-coating layer were employed as the precursor to fabricate MgB
Room temperature magnetoresistance in La 0.67 Sr 0.33 Mn 1-x Co x O 3
Publisher: AIP Publishing
Date: 13-05-2002
DOI: 10.1063/1.1448312
Abstract: The substitution of Co for Mn in La0.67Sr0.33Mn1−xCoxO3 lowers the Curie temperature TC and the metal–insulator transition temperature TMI, accompanying the increase of the resistivity due to the weakening of the double-exchange interaction. The difference value between the TC and the TMI increases with Co substitution which may be attributed to local inhomogeneities in magnetic and electronic transport properties within the doped s le. There is an enhancement of the room temperature magnetoresistance ΔR/R0 induced by the substitution of Co for Mn in La0.67Sr0.33Mn1−xCoxO3, which may be connected with the shift of the Curie temperature TC and metal–insulator transition temperature TMI to the near room temperature through the substitution. Values of the room temperature magnetoresistance ΔR/R0 for La0.67Sr0.33Mn1−xCoxO3 depend not only on the TC but also on the TMI.
Structural, electrical, and magnetic properties of polycrystalline Fe(3-x)Pt(x)O(4) (0 <= x <= 0.10) films
Publisher: AIP Publishing
Date: 04-2011
DOI: 10.1063/1.3563080
Abstract: Polycrystalline Fe3-xPtxO4 films have been prepared by cosputtering at room-temperature. The composition, magnetization and Hall effect measurements indicate that Pt ions have been doped at B-sites. The resistivity is dominated by fluctuation-induced tunneling and decreases with increasing x. The absolute magnetoresistance at room-temperature is above 7% for x≤0.07. The carrier concentration is lower than that of the single-crystal and epitaxial films. A scaling relation of σxy∝σxxn between the Hall and longitudinal conductivities is obtained for all s les, which fits well with the recent developed universal scaling theory. The decreasing trend of the exponent n from 1.72 to 1.57 with increasing x could be qualitatively ascribed to the influence of the Pt2+ ions on the magnetic scattering center concentration of the B-sites Fe2+ ions. These findings make the Fe3-xPtxO4 film a useful candidate for spintronic or extraordinary Hall effect devices applications.
Self-Assembly of Gold Nanowires along Carbon Nanotubes for Ultrahigh-Aspect-Ratio Hybrids
Publisher: American Chemical Society (ACS)
Date: 04-05-2011
DOI: 10.1021/CM1033645
Large anisotropy of magnetic damping in amorphous CoFeB films on GaAs(001)
Publisher: IOP Publishing
Date: 22-05-2020
Annealing effects on the structural, magnetic and electrical properties of the nanocrystalline Fe3O4films
Publisher: IOP Publishing
Date: 14-10-2009
Magnetic entropy change in LaFe 13-x Si x intermetallic compounds
Publisher: AIP Publishing
Date: 13-05-2002
DOI: 10.1063/1.1448793
Abstract: LaFe 13−x Si x compounds with x=2.4, 2.6, and 2.8 have been carefully prepared and characterized. X-ray powder diffraction patterns confirm that the s les crystallize in a single NaZn13-type phase. Magnetic measurements were carried out in a SQUID magnetometer. The Curie temperature Tc of LaFe13−xSix s les decreases nearly 50 K with x increasing from 2.4 to 2.8. Around Tc the s les exhibit a typical second-order phase transition and no trace of first-order itinerant electron metamagnetic transition is found. So it is reliable to characterize the magnetic entropy change around Tc using magnetic measurement. The maximum values of the magnetic entropy change of LaFe13−xSix s les are found to be, at their Curie temperatures, 5.85, 5.9, and 3.7 J/kg.K for x=2.4, 2.6, and 2.8 under a field change of 5 T (0–5 T). For the quite large magnetic entropy change over a wide temperature range, LaFe13−xSix compounds appear, therefore, to be a potential material candidate for magnetic cooling.
Evidence for high-T c
Publisher:
American Physical Society (APS)
Date:
30-11-2009
Publisher: American Physical Society (APS)
Date: 30-11-2009
Microscopic bonding mechanism of welding interface with molten Cu-4Zn deposited on solid-state steel
Publisher: Elsevier BV
Date: 05-2008
Nanoscale pathways for human tooth decay – Central planar defect, organic-rich precipitate and high-angle grain boundary
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.BIOMATERIALS.2019.119748
Abstract: Understanding the pathways and mechanisms of human tooth decay is central to the development of both prophylaxes and treatments, but only limited information is presently available about the initiation of caries at the nanoscale. By combining atom probe tomography and high-resolution electron microscopy, we have found three distinct initial sites for human dental enamel dissolution: a) along the central dark line (CDL) within carbonated apatite nanocrystals, b) at organic-rich precipitates and c) along high-angle grain boundaries. 3D maps of the atoms within hydroxyapatite nanocrystallites in sound and naturally-decayed human dental enamel reveal a higher concentration of Mg and Na in the CDL. The CDL is therefore thought to provide a pathway for the exchange of ions during demineralization and remineralization. Mg and Na enrichment of the CDL also suggests that it is associated with the ribbon-like organic-rich precursor in amelogenesis. Organic-rich precipitates and high-angle grain boundaries were also shown to be more vulnerable to corrosion while low-angle grain boundaries remained intact. This is attributed to the lower crystallinity in these regions.
Raman spectroscopy: Alternate method for strain and carbon substitution study in MgB2
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-0012
Encapsulating MnSe Nanoparticles Inside 3D Hierarchical Carbon Frameworks with Lithium Storage Boosted by in Situ Electrochemical Phase Transformation
Publisher: American Chemical Society (ACS)
Date: 19-08-2019
Abstract: Electrode materials that act through the electrochemical conversion mechanism, such as metal selenides, have been considered as promising anode candidates for lithium-ion batteries (LIBs), although their fast capacity attenuation and inadequate electrical conductivity are impeding their practical application. In this work, these issues are addressed through the efficient fabrication of MnSe nanoparticles inside porous carbon hierarchical architectures for evaluation as anode materials for LIBs. Density functional theory simulations indicate that there is a completely irreversible phase transformation during the initial cycle, and the high structural reversibility of β-MnSe provides a low energy barrier for the diffusion of lithium ions. Electron localization function calculations demonstrate that the phase transformation leads to high charge transfer kinetics and a favorable lithium ion diffusion coefficient. Benefitting from the phase transformation and unique structural engineering, the MnSe/C chestnut-like structures with boosted conductivity deliver enhanced lithium storage performance (885 mA h g
Inverted hysteresis in exchange biased Cr2 O3 coated CrO2 particles
Publisher: AIP Publishing
Date: 28-10-2004
DOI: 10.1063/1.1795983
Abstract: Exchange bias and inverted hysteresis loops were observed in the Cr2O3 coated CrO2 particles with a wide distribution of the blocking temperature. The ferromagnetic coupling between the CrO2 cores and Cr2O3 shell is responsible for exchange bias observed below 292K. In the temperature range of 261K–∼340K, the particles show inverted hysteresis loops, i.e., the negative remanence and coercivity. The most interesting observation is that the particles show an exchange-biased (or shifted) inverted hysteresis loops in between 261K and 292K and that the maximum negative remanence appears at 292K where exchange bias disappears. An antiferromagnetic type of interaction between the blocked particles and the superparamagnetic particles is believed to be responsible to the inverted hysteresis loops.
Application of advanced analytical techniques to study structure-property relationship of hot rolled high strength low alloy steel
Publisher: Informa UK Limited
Date: 2011
In situ growth of ZnO nanodots on carbon hierarchical hollow spheres as high-performance electrodes for lithium-ion batteries
Publisher: Elsevier BV
Date: 02-2018
Boosting Oxygen Reduction Activity of Manganese Oxide Through Strain Effect Caused By Ion Insertion
Publisher: Wiley
Date: 27-11-2022
Abstract: Transition‐metal oxides with a strain effect have attracted immense interest as cathode materials for fuel cells. However, owing to the introduction of heterostructures, substrates, or a large number of defects during the synthesis of strain‐bearing catalysts, not only is the structure–activity relationship complicated but also their performance is mediocre. In this study, a mode of strain introduction is reported. Transition‐metal ions with different electronegativities are intercalated into the cryptomelane‐type manganese oxide octahedral molecular sieves (OMS‐2) structure with K ions as the template, resulting in the octahedral structural distortion of MnO 6 and producing strains of different degrees. Experimental studies reveal that Ni‐OMS‐2 with a high compressive strain (4.12%) exhibits superior oxygen reduction performance with a half‐wave potential (0.825 V vs RHE) greater than those of other reported manganese‐based oxides. This result is related to the increase in the covalence of MnO 6 octahedral configuration and shifting down of the e g band center caused by the higher compression strain. This research avoids the introduction of new chemical bonds in the main structure, weakens the effect of e g electron filling number, and emphasizes the pure strain effect. This concept can be extended to other transition‐metal‐oxide catalysts.
Electronic transport studies on Sb1−x(SiO2)xfilms
Publisher: IOP Publishing
Date: 15-04-2005
Zeolitic imidazolate framework-67 derived cobalt-based catalysts for water splitting
Publisher: Elsevier BV
Date: 12-2022
A voting approach to identify a small number of highly predictive genes using multiple classifiers
Publisher: Springer Science and Business Media LLC
Date: 2009
Role of structural defects on ferromagnetism in amorphous Cr-doped TiO 2 films
Publisher: AIP Publishing
Date: 24-07-2006
DOI: 10.1063/1.2240139
Abstract: Amorphous CrxTi1−xO2 films with different Cr concentrations of 0⩽x⩽0.16 were prepared by cosputtering method at room temperature. All as-deposited s les show hysteresis behavior from 2to340K and the Curie temperatures are well above 390K. The saturation magnetization is about 3.21×10−1μB∕Cr for x=0.05 at 340K and decreases with increasing Cr dopant. After annealing at temperature above 300°C, the films crystallized into anatase structure and lost their ferromagnetic property. The results indicate that the ferromagnetism in amorphous Cr-doped TiO2 films is intrinsic and the structural defects play an important role in the ferromagnetism of Cr:TiO2 system.
Characterization of Nano-Scale Particles in Hot-Rolled, High Strength Low Alloy Steels (HSLA)
Publisher: Trans Tech Publications, Ltd.
Date: 10-2007
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.561-565.2083
Abstract: The contribution of nano-scale particles observed using Atom Probe Tomography in an increase of yield strength of conventional and advanced HSLA steels was studied. The advanced HSLA steel showed higher yield strength than conventional HSLA steel. There were two types of carbides, which primarily contribute to an increase in yield strength of conventional HSLA steel: (i) coarse TiC with average size of 25±5nm and (ii) fine TiC with average radius of 3±1.2nm. The presence of two types of carbides was found in the microstructure of advanced HSLA steel: (i) nano-scale Ti0.98Mo0.02C0.6 carbides with average radius of 2.2±0.5nm, and (ii) C19Cr7Mo24 particles with an average radius of 1.5±0.3nm. The contribution of precipitation hardening in the yield strength of advanced HSLA steel due to the nano-scale particles was 174MPa, while this value in the conventional HSLA steel was 128MPa.
Characterization of the bake-hardening behavior of transformation induced plasticity and dual-phase steels using advanced analytical techniques
Publisher: Iron and Steel Institute of Japan
Date: 2010
On the understanding of the microscopic origin of the properties of diluted magnetic semiconductors by atom probe tomography
Publisher: Elsevier BV
Date: 04-2009
Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation
Publisher: Wiley
Date: 17-03-2021
Phase evolution from Ln2Ti2O7 (Ln=Y and Gd) pyrochlores to brannerites in glass with uranium incorporation
Publisher: Wiley
Date: 10-07-2017
DOI: 10.1111/JACE.15051
Microscopic unravelling of nano-carbon doping in MgB2 superconductors fabricated by diffusion method
Publisher: Elsevier BV
Date: 09-2015
Structures and transport properties of polycrystalline Fe3O4 films
Publisher: IOP Publishing
Date: 07-11-2003
Memory effect and spin-glass-like behavior in Co-Ag granular films
Publisher: American Physical Society (APS)
Date: 11-01-2007
An investigation of LnUO4 (Ln = Dy and Ho): Structures, microstructures, uranium valences and magnetic properties
Publisher: Elsevier BV
Date: 09-2021
Direct Observation of Dopants Distribution and Diffusion in GaAs Planar Nanowires with Atom Probe Tomography
Publisher: American Chemical Society (ACS)
Date: 27-09-2016
Abstract: Intentional and unintentional doping in semiconductor nanowires undoubtedly have significant impact on the device performance. However, spatially resolved precise determination of dopant concentration is challenging due to insufficient sensitivity and resolution of conventional techniques. In this paper, quantitative 3D distribution of Si and Zn dopants in planar GaAs nanowires and their interface with AlGaAs film underneath are obtained by using a unique atom probe tomography technique, providing critical insights for the growth and potential applications of these nanowires.
A Spatially Separated Organic–Inorganic Hybrid Photoelectrochemical Cell for Unassisted Overall Water Splitting
Publisher: American Chemical Society (ACS)
Date: 14-07-2017
Using Soft Lithography to Pattern Highly Oriented Polyacetylene (HOPA) Films via Solventless Polymerization
Publisher: Wiley
Date: 04-08-2004
Electrical and thermoelectric properties of single-wall carbon nanotube doped Bi 2 Te 3
Publisher: AIP Publishing
Date: 16-07-2012
DOI: 10.1063/1.4737898
Abstract: The effects of single-wall carbon nanotube (SWCNT) doping in n-type Bi2Te3 bulk s les on the electrical and thermal transport properties have been studied. Bi2Te3 s les doped with 0–5 wt. % SWCNTs were fabricated using solid state reaction and investigated using x-ray diffraction, transmission electron microscopy, and magneto transport measurements. Results show that the 0.5% doping results in the significant enhancement of the Seebeck coefficience to as high as −231.8 μV/K, giant magneto resistance of up to 110%, reduction of thermal conductivity, and change of sign of the Seebeck coefficient from n to p type depending on the doping level and temperature. The figure of merit, ZT, of the optimum SWCNT doped Bi2Te3 was increased by 25%–40% over a wide temperature range compared to the undoped s le.
Synergistically Interface-Engineered Inorganic Halide Perovskite Photocathodes for Photoelectrochemical CO2 Reduction
Publisher: American Chemical Society (ACS)
Date: 26-09-2023
Layer-structured uranyl-oxide hydroxy-hydrates with Pr(iii ) and Tb(iii ) ions: hydroxyl to oxo transition driven by interlayer cations
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0DT00526F
Abstract: Two new uranyl-oxide hydroxy-hydrate phases with Pr( iii )/Tb( iii ) ions have been synthesized hydrothermally and structurally characterized.
Non-destructive analysis on nano-textured surface of the vertical LED for light enhancement
Publisher: Elsevier BV
Date: 2019
DOI: 10.1016/J.ULTRAMIC.2018.09.003
Abstract: In this work, the nano-textured surface of a GaN-based vertical light emitting diode (VLED) is characterized using a unified framework of non-destructive techniques (NDT) incorporating scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy, Photoluminescence (PL), and X-ray diffraction (XRD) to optimize the light output efficiency. The surface roughness of ∼300 nm is revealed by AFM. Compressive stress-state of 0.667 GPa in the GaN surface is indicated by the E
FeS2 bridging function to enhance charge transfer between MoS2 and g–C3N4 for efficient hydrogen evolution reaction
Publisher: Elsevier BV
Date: 10-2020
Artificial 2D Flux Pinning Centers in MgB2 Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications
Publisher: American Chemical Society (ACS)
Date: 02-07-2019
Plasmon-enhanced alcohol oxidations over porous carbon nanosphere-supported palladium and gold bimetallic nanocatalyst
Publisher: Elsevier BV
Date: 09-2021
In vitro studies of cells grown on the superconductor PrOxFeAs
Publisher: Elsevier BV
Date: 06-2009
DOI: 10.1016/J.MICRON.2008.12.005
Abstract: The recent discovery of arsenic-based high temperature superconductors has reignited interest in the study of superconductor: biological interfaces. However, the new superconductor materials involve the chemistry of arsenic and their toxicity remains unclear [Hand, E., 2008. Nature 452 (24), 922]. In this study the possible adverse effects of this new family of superconductors on cells have been examined. Cell culture studies in conjunction with microscopy and viability assays were employed to examine the influence of arsenic-based superconductor PrO(x)FeAs (x=0.75) material in vitro. Imaging data revealed that cells were well adhered and spread on the surface of the superconductor. Furthermore, cytotoxicity studies showed that cells were unaffected during the time-course of the experiments, providing support for the biocompatibility aspects of PrO(x)FeAs-based superconductor material.
Structure and magnetotransport properties of Fe3 O 4 -SiO2 composite films reactively sputtered at room temperature
Publisher: AIP Publishing
Date: 06-05-2004
DOI: 10.1063/1.1702097
Abstract: ( Fe 3 O 4 ) 1−x –( SiO 2 ) x composite films have been prepared by reactive sputtering iron and SiO2 targets in Ar+O2 mixture at room temperature. Transmission electron microscopy bright field images show that with the increase of SiO2 addition, uniform Fe3O4 grains are well separated by the amorphous SiO2 matrix, forming a well-defined granular structure. Temperature dependence of resistivity ρ(T) indicates that the electron tunneling mechanism featured by log ρ∝T−1/2 dominates the transport properties of the films, which smears out the Verwey transition intrinsic to Fe3O4. This tunneling transport of electrons causes a spin-dependent magnetoresistance {=(ρH−ρ0)/ρ0} of about −4.7% for Fe3O4 films and −1.8% for (Fe3O4)0.6(SiO2)0.4 composite films under a 46 kOe magnetic field at room temperature. Magnetic and magnetoresistance measurements reveal that the antiferromagnetically coupled Fe3O4 grains are decoupled and show the behavior of superparamagnetism at x⩾0.4.
Synthesis of dense, single-crystalline CrO2 nanowire arrays using AAO template-assisted chemical vapor deposition
Publisher: IOP Publishing
Date: 17-02-2011
DOI: 10.1088/0957-4484/22/12/125603
Abstract: High-density, vertically aligned CrO(2) nanowire arrays were obtained via atmospheric-pressure CVD assisted by AAO templates. The CrO(2) nanowire arrays show remarkably enhanced coercivity compared with CrO(2) films or bulk. It was found that the length of the nanowires is greatly influenced by the pore diameter of the AAO template used. The growth mechanism and the pore size dependence of the CrO(2) nanowire arrays are discussed. The present method provides a useful approach for the synthesis of CrO(2) nanowire arrays. Such highly ordered nanowire arrays within an AAO template may have important applications in ultrahigh-density perpendicular magnetic recording devices and the mass production of spintronic nanodevices.
Study of microstructure and magnetotransport properties of CrO2 prepared under HTHP
Publisher: Elsevier BV
Date: 05-2018
The effect of mesoporous bioactive glass on the physiochemical, biological and drug-release properties of poly(dl-lactide-co-glycolide) films
Publisher: Elsevier BV
Date: 04-2009
DOI: 10.1016/J.BIOMATERIALS.2009.01.029
Abstract: Poly(lactide-co-glycolide) (PLGA) has been widely used for bone tissue regeneration. However, it lacks hydrophilicity, bioactivity and sufficient mechanical strength and its acidic degradation by-products can lead to pH decrease in the vicinity of the implants. Mesoporous bioactive glass (MBG) with highly ordered structure (pore size 2-50nm) possesses higher bioactivity than non-mesoporous bioactive glass (BG). The aim of this study is to investigate the effect of MBG on the mechanical strength, in vitro degradation, bioactivity, cellular response and drug release of PLGA films and optimize their physicochemical, biological and drug-delivery properties for bone tissue engineering application. The surface and inner microstructure, mechanical strength and surface hydrophilicity of MBG/PLGA and BG/PLGA films were tested. Results indicated that MBG or BG was uniformly dispersed in the PLGA films. The incorporation of MBG into PLGA films significantly improved their tensile strength, modulus and surface hydrophilicity. MBG/PLGA resulted in an enhanced mechanical strength, in vitro degradation (water absorbance, weight loss and ions release), apatite-formation ability and pH stability in simulated body fluids (SBF), compared to BG/PLGA. MBG/PLGA and BG/PLGA films enhanced human osteoblastic-like cells (HOBs) attachment, spreading and proliferation compared to PLGA. HOBs differentiation was significantly upregulated when cells were cultured on 30 MBG/PLGA for 14 days, compared to 30 BG/PLGA. MBG/PLGA enhanced the accumulative release of dexamethazone (DEX) at early stages (0-200h) compared to BG/PLGA, however, after 200h, DEX-release rates for MBG/PLGA was slower than that of BG/PLGA. The contents of MBG in PLGA films can control the amount of DEX released. Taken together, MBG/PLGA films possessed excellent physicochemical, biological and drug-release properties, indicating their potential application for bone tissue engineering by designing 3D scaffolds according to their corresponding compositions.
Large extraordinary Hall effect and anomalous scaling relations between the Hall and longitudinal conductivities in epsilon-Fe3N nanocrystalline films
Publisher: American Physical Society (APS)
Date: 17-11-2009
Characterisation of nano-grains in MgB2 superconductors by transmission Kikuchi diffraction
Publisher: Elsevier BV
Date: 05-2015
Erratum: Electrical and thermoelectric properties of single-wall carbon nanotube doped Bi2 Te3 (Applied Physics Letters (2012) 101 (031909))
Publisher: AIP Publishing
Date: 07-01-2013
DOI: 10.1063/1.4775732
Ordered Mesoporous Boron Carbon Nitrides with Tunable Mesopore Nanoarchitectonics for Energy Storage and CO2 Adsorption Properties
Publisher: Wiley
Date: 05-04-2022
Abstract: Porous boron carbon nitride (BCN) is one of the exciting systems with unique electrochemical and adsorption properties. However, the synthesis of low‐cost and porous BCN with tunable porosity is challenging, limiting its full potential in a variety of applications. Herein, the preparation of well‐defined mesoporous boron carbon nitride (MBCN) with high specific surface area, tunable pores, and nitrogen contents is demonstrated through a simple integration of chemical polymerization of readily available sucrose and borane ammonia complex (BAC) through the nano‐hard‐templating approach. The bimodal pores are introduced in MBCN by controlling the self‐organization of BAC and sucrose molecules within the nanochannels of the template. It is found that the optimized s le shows a high specific capacitance (296 F g −1 at 0.5 A g −1 ), large specific capacity for sodium‐ion battery (349 mAg h −1 at 50 mAh g −1 ), and excellent CO 2 adsorption capacity (27.14 mmol g −1 at 30 bar). Density functional theory calculations demonstrate that different adsorption sites (BC, BN, CN, and CC) and the large specific surface area strongly support the high adsorption capacity. This finding offers an innovative breakthrough in the design and development of MBCN nanostructures for energy storage and carbon capture applications.
Flux crystal growth of Ba2[(UO2)2Ti2O8]: Structures, spectroscopies and implications
Publisher: Wiley
Date: 17-10-2022
DOI: 10.1111/JACE.18792
Abstract: We report a flux crystal growth of Ba 2 [(UO 2 ) 2 Ti 2 O 8 ] and subsequent structural and spectroscopic studies using multiple techniques. The layered crystal structure, built up with sheets of edge‐sharing dimeric uranyl pentagonal bipyramids and dimeric TiO 5 square pyramids with interlayer Ba(II) ions, was revealed by synchrotron single crystal x‐ray diffraction and confirmed with electron diffraction using a transmission electron microscope. The presence of only hexavalent uranium was confirmed by both diffuse reflectance and x‐ray absorption near‐edge structure spectroscopies, consistent with the bond valence sum calculations. Its vibrational modes were revealed by Raman spectroscopy. In addition, its implications as a potential hexavalent uranium waste form for the immobilization of uranium‐rich radioactive wastes were discussed.
LnUO4‐based glass–ceramic composites as waste forms for the immobilization of lanthanide‐bearing uranium wastes
Publisher: Wiley
Date: 29-07-2022
DOI: 10.1111/JACE.18678
Abstract: We report a comprehensive study on lanthanide monouranate–based glass–ceramic (GC) composites as potential waste forms for the immobilization of the lanthanide actinide fraction waste arising from the reprocessing of spent nuclear fuel (SNF). Although the crystalline LnUO 4 precursor prepared via a nitrate route can be well stabilized in a sodium aluminoborosilicate glass, the in situ crystallization of EuUO 4 in glass from oxide precursors (Eu 2 O 3 and U 3 O 8 ) is rather robust with regards to various processing conditions such as waste loadings, ceramic‐to‐glass ratios, and cooling rates. Scanning electron microscopy and transmission electron microscopy investigations revealed the detailed microstructures, where ∼1–5‐μm spheres for NdUO 4 and EuUO 4 , and ∼1–5‐μm rectangular crystals for DyUO 4 and HoUO 4 were observed in residual glasses. As designed, the pentavalent uranium has been confirmed by diffuse reflectance spectroscopy. Overall, LnUO 4 ‐based GC composite waste forms are chemically durable, offering flexible processing options with wide operating windows for SNF and process waste stream management.
Efficient and scalable perovskite solar cells achieved by buried interface engineering
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA04381E
Abstract: Tetrachloroaluminate anions doped in a poly(triarylamine) layer can improve the wettability of perovskite precursor solution and passivate interfacial trap defects at buried interfaces.
Atomic-scale tomography of semiconductor nanowires
Publisher: Elsevier BV
Date: 12-2015
Atomic scale insights into the segregation/partitioning behaviour in as-sintered multi-main-phase Nd-Ce-Fe-B permanent magnets
Publisher: Elsevier BV
Date: 12-2020
Amorphous nonstoichiometric oxides with tunable room-temperature ferromagnetism and electrical transport
Publisher: Elsevier BV
Date: 10-2020
Magnetic coupling in Mn3O4-coated γ-MnOOH nanowires
Publisher: Thomas Telford Ltd.
Date: 09-2018
Abstract: Mn 3 O 4 -coated γ-MnOOH nanowires were synthesized by using the hydrothermal method. X-ray diffraction and transmission electron microscopy studies reveal that the nanowires have a core (γ-MnOOH)–shell (Mn 3 O 4 ) structure. The magnetic transition temperature of Mn 3 O 4 is slightly lower than the previously reported value because of the increased thermal disturbance for nanomaterials and the influence of the helical magnetism of γ-MnOOH. The hysteresis loop at 50 K keeps the same shape as was measured below the Néel temperature of Mn 3 O 4 because of the short-range order of γ-MnOOH above the transition temperature. The short-range ordering is responsible for the deviation of the hysteresis loop at 300 K from the linear behavior of a normal paramagnetic phase. The magnetic coupling behavior between Mn 3 O 4 and γ-MnOOH also induces an exchange bias effect in the system. The hysteresis loop shifts to the positive direction with increasing measurement temperature. A lower barrier energy is requested for the reversal of magnetic moments on the interface to generate the exchange bias behavior because of the asymmetric magnetic natures of Mn 3 O 4 and γ-MnOOH, which should possess shorter responsive time compared with the traditional antiferromagnetic-ferromagnetic coupling induced exchange bias systems.
Tailoring the electronic structure of Ni5 P4 /Ni2 P catalyst by Co2 P for efficient overall water electrolysis
Publisher: Elsevier BV
Date: 11-2023
Self-Assembly and Self-Orientation of Truncated Octahedral Magnetite Nanocrystals
Publisher: Wiley
Date: 18-09-2006
Construction of hierarchical Cu2+1 O@NiCoAl-layered double hydroxide nanorod arrays electrode for high-performance supercapacitor
Publisher: Elsevier BV
Date: 09-2020
Stable tin perovskite solar cells developed via additive engineering
Publisher: Springer Science and Business Media LLC
Date: 20-05-2021
Fabrication and magnetic properties of ultrathin Fe nanowire arrays
Publisher: AIP Publishing
Date: 15-10-2003
DOI: 10.1063/1.1621459
Abstract: Ultrathin Fe nanowire (about 5 nm in diameter) arrays have been fabricated by electrodeposition using anodic porous alumina templates. These ultrathin nanowires exhibited uniaxial anisotropy and a quite large coercivity (4190 Oe) at 5 K. In addition, the field needed to saturate the magnetization, when the field was applied perpendicularly to the easy axis, was much larger than the shape anisotropy field (2πMS). This saturation field increased with decreasing temperature. We believed that this enhanced saturation field was mainly due to the contribution of the surface spins.
Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in (Ba1-xKx)Fe2As2 Pnictide
Publisher: American Physical Society (APS)
Date: 15-06-2011
Microstructural properties of over-doped GaN-based diluted magnetic semiconductors grown by MOCVD
Publisher: IOP Publishing
Date: 07-2012
Oriented Low‐n Ruddlesden‐Popper Formamidinium‐Based Perovskite for Efficient and Air Stable Solar Cells
Publisher: Wiley
Date: 21-10-2022
Abstract: The relatively lower crystallinity and random orientation of quantum well structures hinder carrier transport and limit the performance of formamidinium (FA) based low‐n 2D perovskite devices. In this work, the crystallization and quantum well orientation are fine tuned to achieve efficient low‐n FA based Ruddlesden–Popper perovskite solar cells. The effects of different ionic additives on the crystallization, orientation, and photovoltaic performance of FA based low‐n 2D perovskites are comparatively investigated. It is found that NH 4 + and SCN − can significantly retard the heterogeneous crystallization of low‐n phases in the intermediate state, and drive the templated growth of quantum well structure with vertical orientation. The optimized photovoltaic device based on (BA) 2 (FA) 3 Pb 4 I 13 achieved a power conversion efficiency (PCE) of 18.14%, setting the highest record for FA‐based low‐n 2D perovskite solar cells as far as it is known (average n = 4). The unencapsulated device exhibited excellent stability and maintained 93.3% of its original PCE at 85 °C, and 86.3% at 1 Sun illumination after 720 h in humid ambient condition.
Giant Hall effect in metal/insulator composite films
Publisher: Elsevier BV
Date: 04-2004
First principles study of 3d transition metal doped Cu3N
Publisher: Elsevier BV
Date: 09-2012
Atom probe specimen preparation methods for nanoparticles
Publisher: Elsevier BV
Date: 03-2022
DOI: 10.1016/J.ULTRAMIC.2021.113420
Abstract: Revealing the position of materials with chemical selectivity at atomic scale within functional nanoparticles is essential to understand and control their performance and cutting-edge atom probe tomography is a powerful tool to undertake this task. In this paper, we demonstrate three effective methods to prepare the needle-shaped specimens required for atom probe tomography measurements from nanoparticles of different sizes and provide ex les of how atom probe can be used to provide data that is critical to their functionality. S les measured include lithium-ion batteries (LIBs) cathode nanoparticles (300 - 500 nm), nickel-doped silicon dioxide (Ni@SiO
Effect of cyclic rapid thermal loadings on the microstructural evolution of a CrMnFeCoNi high-entropy alloy manufactured by selective laser melting
Publisher: Elsevier BV
Date: 09-2020
Structural, optical and magnetic properties of Co-doped ZnO nanorods with hidden secondary phases
Publisher: IOP Publishing
Date: 25-03-2015
DOI: 10.1088/0957-4484/19/45/455702
Abstract: Co-doped ZnO nanorods (composition: Zn(0.955)Co(0.045)O) were grown by a simple surfactant-assisted hydrothermal technique. The morphological, structural, optical and magnetic properties of the as-prepared nanorods were investigated by means of scanning electron microscopy, high-resolution transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, micro-Raman spectroscopy, micro-cathodoluminescence, and vibrating s le magnetometry (VSM). The results showed that the s le had rod-like morphology and that the preferential growth direction was along the c axis. While Co was successfully doped into the ZnO wurtzite lattice structure as revealed by several characterization techniques, hidden secondary phases of Zn(y)Co(3-y)O(4) (0≤y≤1) were also clearly detected by the micro-Raman spectroscopic technique. We propose that the predominant diffusion-limited Ostwald ripening crystal growth mechanism under the hydrothermal coarsening yielded such phase segregation. VSM results showed that the nanorods displayed relatively weak room-temperature ferromagnetism. We suggest that the origin of the ferromagnetism is probably due to the presence of the mixed cation valence of Co via a d-d double-exchange mechanism rather than the real doping effect. It is essential to control the crystal growth mechanism and defect states associated with the ferromagnetism in order to realize the intrinsic diluted magnetic semiconductors.
Low-Dimensional Hybrid Perovskites for Field-Effect Transistors with Improved Stability: Progress and Challenges
Publisher: Wiley
Date: 19-07-2020
Nitrilotriacetic Acid-Modified Magnetic Nanoparticles as a General Agent to Bind Histidine-Tagged Proteins
Publisher: American Chemical Society (ACS)
Date: 27-02-2004
DOI: 10.1021/JA031776D
Abstract: Using Nalpha,Nalpha-bis(carboxymethyl)lysine to react with FePt magnetic nanoparticles, we synthesized the FePt-NTA conjugate, which immobilizes Ni2+ ions and selectively binds to histidine-tagged proteins at concentration as low as 0.5 pM. This simple system serves as a useful alternative to existing protocols for protein separation and also acts as a versatile agent for transporting and anchoring proteins.
One-pot solution growth of 2D/3D perovskite crystalline lateral heterostructures
Publisher: Research Square Platform LLC
Date: 06-04-2022
DOI: 10.21203/RS.3.RS-1495375/V1
Abstract: Halide perovskites, due to their remarkable characteristics including high absorption coefficients, tunable bandgaps, superior carrier dynamics, as well as solution-processed procedures, have demonstrated huge potential in next-generation device applications. Creating perovskite heterostructures, featuring the spatial modulation of structural, electronic, and optical properties, is expected to further boost device performance and may even open up new realms however, direct growth of mixed-dimensional lateral heterostructures remains a significant challenge. Here we present a one-pot solution synthesis of two-/three-dimensional (2D/3D) crystalline perovskite lateral heterostructures, leveraging on their different temperature-dependent solubilities. Various types of heterostructures are demonstrated with well-defined interfaces and negligible ion diffusion, exhibiting clear structural and optical modulations. The resultant photodiodes yield a low dark current less than 0.1 nA and a detectivity exceeding 1013 Jones (much higher than those made of 2D or 3D thin crystals). The facile growth of such lateral crystalline perovskite heterostructures underscores a significant advance and opens up new opportunities for advanced perovskite optoelectronics.
Interfacial energy band engineered CsPbBr3/NiFe-LDH heterostructure catalysts with tunable visible light driven photocatalytic CO2 reduction capability
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2CY01982E
Abstract: CsPbBr 3 /NiFe-LDH heterostructure photocatalysts are developed with tuneable Z-scheme reduction capability for efficient CO 2 reduction performance.
3D atomic-scale insight into semiconductor nanowires
Publisher: IEEE
Date: 09-2016
Atomically Dispersed Single Co Sites in Zeolitic Imidazole Frameworks Promoting High-Efficiency Visible-Light-Driven Hydrogen Production
Publisher: Wiley
Date: 07-2019
Abstract: As photocatalysis technology could transform renewable and clean solar energy into green hydrogen (H
First-principles investigation of intrinsic point defects in perovskite CsSnBr3
Publisher: American Physical Society (APS)
Date: 12-03-2021
Quantification of the zinc dopant concentration in GaAs nanowires
Publisher: IEEE
Date: 12-2012
Atomic and Molecular Hydrogen Impurities in Hybrid Perovskite Solar Cells
Publisher: American Chemical Society (ACS)
Date: 24-01-2022
Confinement-Induced Giant Spin–Orbit-Coupled Magnetic Moment of Co Nanoclusters in TiO2 Films
Publisher: American Chemical Society (ACS)
Date: 29-10-2019
Abstract: High magnetization materials are in great demand for the fabrication of advanced multifunctional magnetic devices. Notwithstanding this demand, the development of new materials with these attributes has been relatively slow. In this work, we propose a new strategy to achieve high magnetic moments above room temperature. Our material engineering approach invoked the embedding of magnetic nanoclusters in an oxide matrix. By precisely controlling pulsed laser deposition parameters, Co nanoclusters are formed in a 5 at % Co-TiO
Electronic Structure and Ferromagnetism Modulation in Cu/Cu2O Interface: Impact of Interfacial Cu Vacancy and Its Diffusion
Publisher: Springer Science and Business Media LLC
Date: 19-10-2015
DOI: 10.1038/SREP15191
Abstract: Cu/Cu 2 O composite structures have been discovered to show sizable ferromagnetism (FM) with the potential applications in spintronic devices. To date, there is no consensus on the FM origin in Cu/Cu 2 O systems. Here, first principles calculations are performed on the interface structure to explore the microscopic mechanism of the FM. It is found that only the Cu vacancy (V Cu ) adjacent to the outermost Cu 2 O layer induces a considerable magnetic moment, mostly contributed by 2 p orbitals of the nearest-neighbor oxygen atom (O NN ) with two dangling bonds and 3 d orbitals of the Cu atoms bonding with the O NN . Meanwhile, the charge transfer from Cu to Cu 2 O creates higher density of states at the Fermi level and subsequently leads to the spontaneous FM. Furthermore, the FM could be modulated by the amount of interfacial V Cu , governed by the interfacial Cu diffusion with a moderate energy barrier (~1.2 eV). These findings provide insights into the FM mechanism and tuning the FM via interfacial cation diffusion in the Cu/Cu 2 O contact.
High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22
Publisher: American Astronomical Society
Date: 28-12-2017
Negative Poisson's ratio in 2D life-boat structured crystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NA00352A
Abstract: The auxetic behavior is strongly correlated to the bond stretch or rotation and a method to discover it is provided.
Phonon localization in single wall carbon nanotube: Combined effect of 13C isotope and vacancies
Publisher: AIP Publishing
Date: 24-07-2020
DOI: 10.1063/5.0011810
Abstract: The combined effect of 13C isotope doping and vacancies on the phonon properties of a single-wall carbon nanotube is theoretically investigated using the forced oscillation method. The phonon density of states (PDOS) is calculated for all (0%–100%) 13C isotope contents and wide (0%–30%) vacancy concentrations. We found a redshift of the Raman active E2g peak in the PDOS with increasing isotope contents, while the disappearance of the E2g peak and the appearance of a new sharp peak in the low-energy region with increasing combined defects. Both 13C isotope and combined defects cause the localization of the high-energy optical phonons. We calculated the typical mode patterns for the in-plane longitudinal optical phonon to visualize the localization phenomena elaborately at the presence of isotope and vacancies. The calculated average localization length shows an asymmetric behavior with increasing 13C isotope concentrations which is in good agreement with the 13C isotope dependence localization length of single-layer graphene. We noticed that a typical localization length is on the order of ∼1 nm at 70% isotope concentrations. The combined effect of 13C isotope and vacancies shows an abruptly decreasing localization length with increasing defect densities. These results are important to understand the heat conduction as well as nanoscopic vibrational studies such as tip-enhanced Raman spectra in carbon nanotubes where the local phonon energies may be mapped.
Trapped-Hydrogen-Induced Energy Loss in Tin-Based Hybrid Perovskite Solar Cells
Publisher: American Physical Society (APS)
Date: 29-09-2022
A superior photocatalytic adsorbent with charge redistribution for rapid removal of pollutants from water
Publisher: Elsevier BV
Date: 12-2022
Room-temperature ferromagnetism induced by Cu vacancies in Cu
x
(Cu
2
Publisher:
IOP Publishing
Date:
09-2015
Microstructural and magnetic properties of passivated Co nanoparticle films
Publisher: Elsevier BV
Date: 04-2004
Dopamine as A Robust Anchor to Immobilize Functional Molecules on the Iron Oxide Shell of Magnetic Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 27-07-2004
DOI: 10.1021/JA0464802
Abstract: We report on the use of dopamine (DA) as a robust molecular anchor to link functional molecules to the iron oxide shell of magnetic nanoparticles. Using nitrilotriacetic acid (NTA) as the functional molecule, we created a system with an M/Fe2O3-DA-NTA (M = Co or SmCo5.2) nanostructure, which possesses high stability and specificity for separating histidine-tagged proteins. The well-established biocompatibility of iron oxide and the robust covalent bonds between DA and Fe2O3 render this strategy attractive for constructing biofunctional magnetic nanoparticles containing iron oxide.
Hydrogen‐Induced Nonradiative Recombination in All‐Inorganic CsPbI3 Perovskite Solar Cells
Publisher: Wiley
Date: 22-05-2022
Abstract: All‐inorganic halide perovskites have thus far exhibited better thermal stability but lower power conversion efficiency (PCE), compared with their organic–inorganic hybrid counterparts. The experimentally observed nonradiative recombination loss is commonly attributed to the prevalence of native deep defects, yet the exact microscopic origin remains elusive. Based on density functional theory calculations, it is demonstrated that hydrogen impurities may incorporate in the prototypical all‐inorganic perovskite CsPbI 3 with a high density and serve as a new source of efficient nonradiative recombination centers. The resultant nonradiative efficiency loss can be significantly higher than those induced by native deep defects, namely interstitials and antisites , contributing to the subdued performance of the CsPbI 3 ‐based devices. Furthermore, it is proposed that the iodine‐moderate growth conditions can effectively reduce the detrimental hydrogen ions. These results highlight the impact of unintentionally incorporated impurities and offer insights into the optimal synthetic route and practical operating protocols in the field of all‐inorganic perovskite solar cells.
Absolute copy number fitting from shallow whole genome sequencing data
Publisher: Cold Spring Harbor Laboratory
Date: 20-07-2021
DOI: 10.1101/2021.07.19.452658
Abstract: Low-coverage or shallow whole genome sequencing (sWGS) approaches can efficiently detect somatic copy number aberrations (SCNAs) at low cost. This is clinically important for many cancers, in particular cancers with severe chromosomal instability (CIN) that frequently lack actionable point mutations and are characterised by poor disease outcome. Absolute copy number (ACN), measured in DNA copies per cancer cell, is required for meaningful comparisons between copy number states, but is challenging to estimate and in practice often requires manual curation. Using a total of 60 cancer cell lines, 148 patient-derived xenograft (PDX) and 142 clinical tissue s les, we evaluate the performance of available tools for obtaining ACN from sWGS. We provide a validated and refined tool called Rascal ( r elative to a bsolute copy number scal ing) that provides improved fitting algorithms and enables interactive visualisation of copy number profiles. These approaches are highly applicable to both pre-clinical and translational research studies on SCNA-driven cancers and provide more robust ACN fits from sWGS data than currently available tools.
Enhanced photoelectrochemical water-splitting performance with a hierarchical heterostructure: Co3 O4 nanodots anchored TiO2 @P-C3 N4 core-shell nanorod arrays
Publisher: Elsevier BV
Date: 2021
High mobility in α-phosphorene isostructures with low deformation potential
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9CP05828A
Abstract: The exceptionally low deformation potential is proposed as the key determinant for the high carrier mobility in ten possible α-phosphorene isostructures.
Defects induced huge magnetoresistance in epitaxial La1–xSrxMnO3 thin films deposited by magnetic sputtering
Publisher: AIP Publishing
Date: 28-10-2019
DOI: 10.1063/1.5120838
Abstract: In this work, epitaxial La1–xSrxMnO3 (LSMO) films were fabricated on SrTiO3 substrates at temperatures (Ts) ranging from 550 to 750 °C by RF magnetron sputtering. Significant Ts-dependent structural, magnetic, and magnetotransport properties were observed. The LSMO (Ts = 750 °C) film exhibits the colossal magnetoresistance (CMR) of −47% under the magnetic field (H) of 5 T. In contrast, the LSMO (Ts = 650 °C) film demonstrates a huge magnetoresistance (MR) of −98% (H = 5 T) around the metal-insulator transition temperature and –59% at 5 K. The spin-glass-like behaviors indicate that the defects, particularly the oxygen vacancies, in the epitaxial LSMO (Ts = 650 °C) films destroy the double exchange. The huge MR is related to the defect modulated magnetic structures and spin-dependent magnetotransport properties. Our work helps to understand the physical mechanism of the CMR and provides a way for tuning the magnetotransport properties of the perovskite films.
Grain size quantification by optical microscopy, electron backscatter diffraction, and magnetic force microscopy
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.MICRON.2017.06.001
Abstract: Quantification of microstructure, especially grain size, in polycrystalline materials is a vital aspect to understand the structure-property relationships in these materials. In this paper, representative characterization techniques for determining the grain size, including optical microscopy (OM), electron backscatter diffraction (EBSD) in the scanning electron microscopy (SEM), and atomic force microscopy/magnetic force microscopy (AFM/MFM), are thoroughly evaluated in comparison, illustrated by rare-earth sintered Nd-Fe-B permanent magnets. Potential applications and additional information achieved by using aforementioned characterization techniques have been discussed and summarized.
Chemical synthesis of narrowly dispersed SmCo5 nanoparticles
Publisher: AIP Publishing
Date: 09-05-2003
DOI: 10.1063/1.1537697
Abstract: In this article we report a chemical synthetic means for generating a high Ku magnetic material—narrowly dispersed nanoparticles of SmCo5. Using Co2(CO)8 and Sm(acac)3 as the precursors under air-free conditions, we produced SmCo5 nanoparticles according to the procedure reported by Sun et al. [Science 287, 1981 (2000)] but with some modifications. The nanoparticles, with diameters of 6–8 nm, have a SmCo5 composition, as indicated by transmission electron microscopy, electron diffraction, and x-ray photoelectron spectroscopy. The magnetization measurement of the nanoparticles, exhibits superparamagnetism, which is blocked for temperatures below ∼110 K, suggesting Ku to be ∼2.1×106 erg/cm3 for the as-prepared particles.
Magnetoresistance Crossover in Cobalt/Poly(3-hexylthiophene,2,5-diyl) Hybrid Films Due to the Interface Effect
Publisher: American Physical Society (APS)
Date: 11-03-2019
Growth and optimization of hybrid perovskite single crystals for optoelectronics/electronics and sensing
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC00473A
Abstract: A comprehensive review on recent advances in optoelectronic and sensing technologies based on hybrid perovskite single crystals.
Stable tin perovskite solar cells enabled by widening the time window for crystallization
Publisher: Springer Science and Business Media LLC
Date: 02-02-2021
The Heterogeneity Between Lynch-Associated and Sporadic MMR Deficiency in Colorectal Cancers
Publisher: Oxford University Press (OUP)
Date: 20-02-2018
DOI: 10.1093/JNCI/DJY004
Abstract: Previous studies demonstrated that prognosis of germline deficiency in mismatch repair protein (dMMR) was different from that of sporadic dMMR. The underlying mechanism has not been studied. From a prospectively maintained database, we collected dMMR colorectal cancer (CRC) patients identified by postoperative immunohistochemistry screening. According to genetic test, patients were grouped as Lynch-associated or sporadic dMMR. We compared the clinical-pathological features, prognosis, and immunoreactive differences between the two groups. By whole-exome sequencing and neoantigen detection pipeline, mutational frequencies and neoantigen burdens were also compared. All statistical tests were two-sided. Sixty-seven sporadic dMMR and 85 Lynch-associated CRC patients were included in the study. Sporadic dMMR patients were older (P < .001) and their tumors were poorly differentiated (P = .03). The survival was better in the Lynch-associated group (P = .001). After adjustment, the difference still remained statistically significant (hazard ratio = 0.29, 95% confidence interval = 0.09 to 0.95, P = .04). The scores of Crohn's-like reaction (CRO P < .001), immunoreactions in the invasive margin (IM P = .01), tumor stroma (TS P = .009), and cancer nest (CN P = .02) of the Lynch-associated group were statistically significantly higher. The numbers of CD3+, CD8+, Foxp3+ tumor-infiltrating lymphocytes (TILs) in IM CD3+, CD4+ TILs in TS and CD3+, CD4+, CD8+ TILs in CN were statistically significantly higher in Lynch-associated dMMR patients. Based on the 16 patients who under went whole-exome sequencing, there were also more somatic mutations and neoantigen burdens in the Lynch-associated group compared with the sporadic dMMR group (439 t vs 68 t, P = .006 628 t vs 97 t, P = .009). There are heterogeneities in dMMR CRCs. Lynch-associated dMMR patients present with more somatic mutations and neoantigens compared with sporadic dMMR, which probably results in stronger immunoreactions and survival improvement.
Observation of large Hall sensitivity in thin Fe-Ge amorphous composite films
Publisher: AIP Publishing
Date: 15-10-2005
DOI: 10.1063/1.2106016
Abstract: Amorphous FexGe1−x films with different metal volume fractions (0.40& x& .00) and film thicknesses 4–300nm were fabricated by a cosputtering method. Magnetic and magnetotransport measurements indicated that the Fe–Ge films are ferromagnetic even above room temperature. A Hall sensitivity as large as 82V∕AT was obtained in the Fe0.67Ge0.33 film with a thickness of 4.1nm. More importantly, it was found that the Hall sensitivity does not depend on the temperature in the temperature range of 50–300K. In addition, the Hall resistance depends linearly on the magnetic field within the range of −2.5–2.5kOe. This linear dependence, the larger sensitivity, and its temperature independence indicate that Fe–Ge films are potential material candidates for field sensors in a very broad temperature range.
Thermal-strain-induced enhancement of electromagnetic properties of SiC-MgB2 composites
Publisher: AIP Publishing
Date: 26-01-2009
DOI: 10.1063/1.3078396
Abstract: The effect of thermal strain caused by the different thermal expansion coefficients (α) of the MgB2 and SiC phases on the electromagnetic properties was studied for SiC–MgB2 composite, which was made by premixing SiC and B, followed by Mg diffusion and reaction. Thermal strain in the MgB2 phase was demonstrated with x-ray diffraction, Raman spectroscopy, and transmission electron microscopy. In contrast to the common practice of improving the critical current density Jc and the upper critical field Hc2 of MgB2 through chemical substitution, by taking advantage of residual thermal strains, we are able to design a composite showing only a small decrease in the critical temperature and a little increase in resistivity but a significant improvement over the Jc and Hc2 of pure MgB2.
Strain-Engineered Ultrahigh Mobility in Phosphorene for Terahertz Transistors
Publisher: Wiley
Date: 08-01-2019
Performance modulation of α-MnO 2 nanowires by crystal facet engineering
Publisher: Springer Science and Business Media LLC
Date: 11-03-2052
DOI: 10.1038/SREP08987
Abstract: Modulation of material physical and chemical properties through selective surface engineering is currently one of the most active research fields, aimed at optimizing functional performance for applications. The activity of exposed crystal planes determines the catalytic, sensory, photocatalytic and electrochemical behavior of a material. In the research on nanomagnets, it opens up new perspectives in the fields of nanoelectronics, spintronics and quantum computation. Herein, we demonstrate controllable magnetic modulation of α-MnO 2 nanowires, which displayed surface ferromagnetism or antiferromagnetism, depending on the exposed plane. First-principles density functional theory calculations confirm that both Mn- and O-terminated α-MnO 2 (1 1 0) surfaces exhibit ferromagnetic ordering. The investigation of surface-controlled magnetic particles will lead to significant progress in our fundamental understanding of functional aspects of magnetism on the nanoscale, facilitating rational design of nanomagnets. Moreover, we approved that the facet engineering pave the way on designing semiconductors possessing unique properties for novel energy applications, owing to that the bandgap and the electronic transport of the semiconductor can be tailored via exposed surface modulations.
Magic numbers of nanoholes in graphene: Tunable magnetism and semiconductivity
Publisher: American Physical Society (APS)
Date: 06-09-2011
Porous carbon prepared via combustion and acid treatment as flexible zinc-ion capacitor electrode material
Publisher: Elsevier BV
Date: 05-2020
Microfluidic spray drying as a versatile assembly route of functional particles
Publisher: Elsevier BV
Date: 08-2011
Hierarchical NiMn-layered double hydroxides@CuO core-shell heterostructure in-situ generated on Cu(OH)2 nanorod arrays for high performance supercapacitors
Publisher: Elsevier BV
Date: 2020
Synthetic uranium oxide hydrate materials: Current advances and future perspectives
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1DT03916D
Abstract: A comprehensive review of synthetic uranium oxide hydrate phases focussing on current advances with gap analysis and perspectives for potential future studies.
Electrode-induced impurities in tin halide perovskite solar cell material CsSnBr3 from first principles
Publisher: Springer Science and Business Media LLC
Date: 06-05-2021
DOI: 10.1038/S41524-021-00533-5
Abstract: All-inorganic lead-free CsSnBr 3 is attractive for applications in solar cells due to its nontoxicity and stability, but the device performance to date has been poor. Besides the intrinsic properties, impurities induced from electrodes may significantly influence the device performance. Here, we systematically studied the stability, transition energy levels, and diffusion of impurities from the most commonly used electrodes ( Au, Ag, Cu, graphite , and graphene ) in CsSnBr 3 based on density functional theory calculations. Our results reveal that, whereas graphite and graphene electrodes exhibit negligible influence on CsSnBr 3 due to the relatively high formation energies for carbon impurities in CsSnBr 3 , atoms from the metal electrodes can effectively diffuse into CsSnBr 3 along interstice and form electrically active impurities in CsSnBr 3 . In this case, a significant amount of donor interstitial impurities, such as $$Ag_i^ +$$ A g i + , $$Cu_i^ +$$ C u i + , and $$Au_i^ +$$ A u i + , will be formed under p -type conditions, whereas the Sn-site substitutional acceptor impurities, namely $$Au_{Sn}^{2 - }$$ A u S n 2 − , $$Ag_{Sn}^{2 - }$$ A g S n 2 − , and $$Cu_{Sn}^{2 - }$$ C u S n 2 − , are the dominant impurities, especially under n -type conditions. In particular, except for $$Au_i^ +$$ A u i + , all these major impurities from the metal electrodes act as nonradiative recombination centers in CsSnBr 3 and significantly degrade the device performance. Our work highlights the distinct behaviors of the electrode impurities in CsSnBr 3 and their influence on the related devices and provides valuable information for identifying suitable electrodes for optoelectronic applications.
(0 0 1)-oriented Bi2 Sr2 Co2 Oy and Ca3 Co4 O9 films: Self-assembly orientation and growth mechanism by chemical solution deposition
Publisher: Elsevier BV
Date: 07-2010
Fluoride-assisted detection of glutathione by surface Ce3+/Ce4+ engineered nanoceria
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TB01135B
Abstract: Nanoceria prepared with different Ce 3+ /Ce 4+ ratios show different oxidase mimetic activities. The activity is enhanced selectively in presence of fluoride ions and used for glutathione detection.
Growth and valence excitations of ZnO:M(Al, In, Sn) hierarchical nanostructures
Publisher: American Chemical Society (ACS)
Date: 05-10-2010
DOI: 10.1021/JP103594M
Extraordinary Hall effect in( Ni 80
Publisher:
American Physical Society (APS)
Date:
27-12-2004
Publisher: American Physical Society (APS)
Date: 27-12-2004
Quantification of graphene based core/shell quantum dots from first principles
Publisher: AIP Publishing
Date: 31-10-2011
DOI: 10.1063/1.3657488
Abstract: Density functional calculations are performed to study the electronic structure of recently proposed graphene/graphane based core/shell quantum dots, which have a type I band alignment and exhibit quantized carrier energy levels. Strong confinement is robust with shell thickness. The bandgap, band offset, and the number of confined carrier orbitals with different size and geometry are determined. Our findings indicate that these core/shell dots are potentially well suited for the design of advanced diode lasers and room-temperature single electron devices. The proposed method to determine the number of confined orbitals is applicable for other quantum dot systems.
Electrical control of memristance and magnetoresistance in oxide magnetic tunnel junctions
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00522A
Abstract: Electric-field control of magnetic and transport properties of magnetic tunnel junctions has been demonstrated.
3D Atomic‐Scale Insights into Anisotropic Core–Shell‐Structured InGaAs Nanowires Grown by Metal–Organic Chemical Vapor Deposition
Publisher: Wiley
Date: 19-06-2017
Abstract: III–V ternary InGaAs nanowires have great potential for electronic and optoelectronic device applications however, the 3D structure and chemistry at the atomic‐scale inside the nanowires remain unclear, which hinders tailoring the nanowires for specific applications. Here, atom probe tomography is used in conjunction with a first‐principles simulation to investigate the 3D structure and chemistry of InGaAs nanowires, and reveals i) the nanowires form a spontaneous core–shell structure with a Ga‐enriched core and an In‐enriched shell, due to different growth mechanisms in the axial and lateral directions ii) the shape of the core evolves from hexagon into Reuleaux triangle and grows larger, which results from In outward and Ga inward interdiffusion occurring at the core–shell interface and iii) the irregular hexagonal shell manifests an anisotropic growth rate on {112}A and {112}B facets. Accordingly, a model in terms of the core–shell shape and chemistry evolution is proposed, which provides fresh insights into the growth of these nanowires.
Engineering Co Vacancies for Tuning Electrical Properties of p-Type Semiconducting Co3 O4 Films
Publisher: American Chemical Society (ACS)
Date: 26-05-2021
Hydrothermal synthesis, structures and magnetic properties of two new holmium(III) oxalato complexes
Publisher: Informa UK Limited
Date: 25-04-2017
Microstructure and mechanical properties of Mg-6Zn-xCu-0.6Zr (wt.%) alloys
Publisher: Elsevier BV
Date: 02-2011
ITO regulated high-performance n-Si/ITO/α-Fe2 O3 Z-scheme heterostructure towards photoelectrochemical water splitting
Publisher: Elsevier BV
Date: 2020
Graphene based dots and antidots: A comparative study from first principles
Publisher: American Scientific Publishers
Date: 02-2013
Abstract: Graphene based quantum dots and antidots are two nanostructures of primary importance for their fundamental physics and technological applications, particularly in the emerging field of graphene-based nanoelectronics and nanospintronics. Herein, based on first principles density functional theory calculations, we report a comparative study on the electronic structure of these two structurally complementary entities, where the bandgap opening, edge magnetism and the role of hydrogenation are investigated. Our results show the ersity of electronic structures of various dots and antidots, whose properties are sensitive to the edge detailed geometry (including size and shape and edge type). Hydrogen passivation plays an essential roal in affecting the related properties, in particular, it leads to larger bandgap values and suppress the edge magnetism. The frontier orbital analysis is employed to rationalize and compare the complicated nature of dots and antidots. Based on the specific geometrical consideration and the total energy competition of the ground antiferromagnetic and the ferromagnetic states, some magnetic structures (the unpassivated 42-atom-antidot and 54-atom-dot) are proposed to be useful as magnetic switches.
Multilayer NiMn layered double hydroxide nanosheets covered porous Co3 O4 nanowire arrays with hierarchical structure for high-performance supercapacitors
Publisher: Elsevier BV
Date: 11-2019
Extraordinary hall effect in CoxPt100-x films
Publisher: AIP Publishing
Date: 13-05-2002
DOI: 10.1063/1.1447286
Abstract: Co x Pt 100−x alloy films, 8.7⩽x⩽40.6, have been fabricated by the magnetron co-sputtering technique. The structure of the films has been studied by x-ray diffraction and transmission electron microscopy. The results indicate the existence of CoPt3 phase in these films. Electric transport and magnetotransport measurements have been performed in the temperature range of 5–300 K and field range of −5–5 T, in which the longitudinal resistivity (ρxx) and extraordinary Hall resistivity (ρs) have been obtained. A power law dependence of extraordinary Hall resistivity on the longitudinal resistivity, ρs∝ρxxv, is observed, however the value of the exponent (v) changes from 1 to 1.6 as the temperature changes from 5 to 100 K and above. Different v values suggest different mechanisms of the extraordinary Hall effect. The dependence of the Hall resistivity on the Co concentration, x, has also been studied.
Multi-interfacial Ni/Mo2 C ultrafine hybrids anchored on nitrogen-doped carbon nanosheets as a highly efficient electrocatalyst for water splitting
Publisher: Elsevier BV
Date: 12-2022
A large spin-crossover [Fe4L4]8+ tetrahedral cage
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TC00991J
Abstract: A large iron( ii ) tetrahedral cage displays temperature induced spin-crossover and liesst effects.
Design and In Situ Growth of Cu2O‐Blended Heterojunction Directed by Energy‐Band Engineering: Toward High Photoelectrochemical Performance
Publisher: Wiley
Date: 23-02-2022
Abstract: In the field of photoelectrochemical (PEC) water splitting, cuprous oxide (Cu 2 O) is one of the most promising photocathode materials, but its performance is restricted by poor carrier separation ability and low photovoltage. In order to overcome these limitations, a new kind of Cu 2 O‐ZnO blended heterojunction photocathode is designed and prepared by novel one‐step thermal oxidation method. ZnO granules are uniformly distributed in Cu 2 O film matrix, forming a granular structure, which enhances the band bending of Cu 2 O in the electrolyte and improves the photovoltage. In addition, the formed ladder type band alignment of Cu 2 O‐ZnO facilitates the spatial separation of photoexcited carriers. Different from the conventional layered heterojunction, the granular structured heterojunction proposed in this work extends the built‐in electric field region and further promotes the transmission of photoexcited carriers from the photoelectrode to the electrolyte. At 0 V vs reversible hydrogen electrode (RHE), the photocurrent density of Cu 2 O‐ZnO film is as high as −8.7 mA cm −2 , which is over 6 times that of bare Cu 2 O (−1.3 mA cm −2 ). The onset potential positively shifts from 0.57 V vs RHE to 0.78 V vs RHE. This work provides an effective strategy for improving the PEC performance from the perspective of band alignment and material structure.
Insights into the Silver Reflection Layer of a Vertical LED for Light Emission Optimization
Publisher: American Chemical Society (ACS)
Date: 10-07-2017
Abstract: In this work, Ag as a highly reflective mirror layer of gallium nitride (GaN)-based blue vertical light-emitting diodes (VLEDs) has been systematically investigated by correlating scanning electron microscopy/energy dispersive X-ray spectroscopy/transmission Kikuchi diffraction/electron backscatter diffraction, aberration-corrected scanning transmission electron microscopy, and atomic force microscopy techniques. In the context of high-efficiency lighting, three critical aspects have been scrutinized on the nanoscale: (1) chemical diffusion, (2) grain morphology, and (3) surface topography of the Ag layer. We found that nanoscale inhomogeneous distribution of In in InGaN/GaN quantum wells (QWs), interfacial diffusion (In/Ga out-diffusion into the Ag layer and diffusion of Ag into p-GaN and QWs), and Ag agglomeration deteriorate the light reflectivity, which account for the decreased luminous efficiency in VLEDs. Meanwhile, the surface morphology and topographical analyses revealed the nanomorphology of the Ag layer, where a nanograin size of ∼300 nm with special nanotwinned boundaries and an extremely smooth surface of ∼3-4 nm are strongly desired for better reflectivity. Further, on the basis of these microscopy results, suggestions on light extraction optimization are given to improve the performance of GaN-based blue VLEDs. Our findings enable fresh and deep understanding of performance-microstructure correlation of LEDs on the nanoscale, providing guidance to the design and manufacture of high-performance LED devices.
Extrinsic Two-Dimensional Flux Pinning Centers in MgB 2 Superconductors Induced by Graphene-Coated Boron
Publisher: American Chemical Society (ACS)
Date: 20-02-2019
Abstract: Extrinsic two-dimensional flux pinning centers, via graphene-encapsulated boron powder as precursors, have been introduced into MgB
Realization of High Magnetization in Artificially Designed Ni/NiO Layers through Exchange Coupling
Publisher: Wiley
Date: 15-09-2023
Training effect of exchange bias in gamma-Fe2O3 coated Fe nanoparticles
Publisher: American Physical Society (APS)
Date: 28-06-2004
Shape-controlled synthesis and assembly of copper sulfide nanoparticles
Publisher: American Chemical Society (ACS)
Date: 16-05-2008
DOI: 10.1021/CG701145Q
Role of point defects in room-temperature ferromagnetism of Cr-doped ZnO
Publisher: AIP Publishing
Date: 13-08-2007
DOI: 10.1063/1.2772176
Effects of Illumination and Ferroelectric Field on Nanoscale Al:ZnO Films: Implications for Nonvolatile Multistage Storage and Photosensor Devices
Publisher: American Chemical Society (ACS)
Date: 18-05-2020
Towards fluorinated Ruddlesden–Popper perovskites with enhanced physical properties: a study on (3-FC6H4CH2CH2NH3)2PbI4 sin
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1QM00329A
Abstract: This work presents the design, synthesis, crystal growth, and property characterization of a fluorinated Ruddlesden–Popper perovskite (3-FPEA) 2 PbI 4 .
The Redistribution and Alignment of Crystalline Flakes in a Bulk Metallic Glass Composite during Thermoplastic Forming
Publisher: Trans Tech Publications, Ltd.
Date: 12-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.702-703.971
Abstract: An In-situ Mg-based bulk metallic glass (BMG) composite containing 40% volume fraction of Mg-rich crystalline flakes was produced by die casting. During cooling from the melt, the flakes nucleate heterogeneously and subsequently grow with their broad faces parallel to the {0001} plane. This generated a uniform dispersion of randomly-oriented flakes within an amorphous matrix. When compressed uniaxially up to 60% reduction in the supercooled liquid (SCL) region, the flakes in this composite were substantially aligned their broad faces towards the compression plane that generated a strong //ND fibre texture.
Perovskite-Nanoparticle-Incorporated NH2-MIL-125(Ti) Nanoreactors with an Optimal Conduction Band Offset for Visible-Light-Driven CO2 Reduction
Publisher: American Chemical Society (ACS)
Date: 09-2022
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