A5059850130- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Metamaterials and Metasurfaces Applications
- Advanced Optical Sensing Technologies
- Power Systems and Renewable Energy
- Antenna Design and Analysis
- Advanced Thermoelectric Materials and Devices
- Advanced Antenna and Metasurface Technologies
- Radiation Detection and Scintillator Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Acoustic Wave Resonator Technologies
- 2D Materials and Applications
- Power System Optimization and Stability
- Optimal Power Flow Distribution
- Multicomponent Synthesis of Heterocycles
- Perovskite Materials and Applications
- High-Voltage Power Transmission Systems
- Magnetic and transport properties of perovskites and related materials
- Advanced Fluorescence Microscopy Techniques
- Particle Detector Development and Performance
- HVDC Systems and Fault Protection
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Microgrid Control and Optimization
Tsinghua University
2006-2025
China Jiliang University
2019-2024
Jilin University
2011-2024
State Grid Corporation of China (China)
2021-2024
Union Hospital
2024
Tangshan People's Hospital
2024
Second Affiliated Hospital of Zhejiang University
2024
Southwest Jiaotong University
2021-2024
Southern University of Science and Technology
2024
North China Electric Power University
2020-2023
We report on the coupling between ferroelectric and magnetic order parameters in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet. This facilitates interconversion of energies stored electric fields plays an important role many devices, including transducers, field sensors, etc. Such nanostructures were deposited single-crystal SrTiO3 (001) substrates by pulsed laser deposition from single Ba-Ti-Co-Fe-oxide target. The films are epitaxial in-plane as well out-of-plane with self-assembled...
A novel composite hydrogel was prepared via UV irradiation copolymerization of acrylic acid and maize bran (MB) in the presence initiator (2,2-dimethoxy-2-phenylacetophenone ammonium persulfate) cross-linker (N,N′-methylenebis(acrylamide)). Under optimized conditions, bran–poly(acrylic acid) obtained (2507 g g–1 distilled water 658 0.9 wt % NaCl solution). Effects granularity, salt concentration, various cations anions on absorbency were investigated. It found that swelling extremely...
Tuning carrier concentration via chemical doping is the most successful strategy to optimize thermoelectric figure of merit. Nevertheless, how dopants affect charge transport not completely understood. Here we unravel effects by explicitly including scattering carriers with on properties poly(3,4-ethylenedioxythiophene), PEDOT, which a p-type material highest merit reported. We corroborate that PEDOT exhibits distinct transition from aromatic quinoid-like structure backbone, and...
A detrimental competition between the urea oxidation reaction (UOR) and oxygen evolution is identified. Strategies are proposed to alleviate such boost performance of UOR other organic compound reactions.
Blocking heat in two ways Low thermal conductivity is important for barrier coatings, thermoelectrics, and other applications. Gibson et al . combined complementary methods that manipulate internal interface properties to dramatically decrease the of inorganic material BiO 2 Cl Se (see Perspective by Kim Cahill). The authors took advantage both in-plane structural distortions weak bonding layers push down 0.1 watts per kelvin meter: only four times air. principles should be applicable...
We demonstrate the room-temperature control of magnetization reversal with an electric field in epitaxial nanostructure consisting ferrimagnetic nanopillars embedded a ferroelectric matrix. This was achieved by combining weak, uniform magnetic switching to selectively switch pillars only one configuration. On basis these experimental results, we propose use assist recording multiferroic systems high perpendicular anisotropy.
We have grown BiFeO3 thin films on SrRuO3∕SrTiO3 and SrRuO3∕SrTiO3∕Si using liquid delivery metalorganic chemical vapor deposition. Epitaxial were successfully prepared through the systematic control of reaction deposition process. found that film composition phase equilibrium are sensitive to Bi:Fe ratio in precursor. Fe-rich mixtures show existence α-Fe2O3, while Bi-rich presence β-Bi2O3 as a second at surface. In optimized films, we able obtain an epitaxial single perovskite film....
BiFeO3 simultaneously shows antiferromagnetic and ferroelectric order with high transition temperatures, i.e. T N ∼ 370°C C 830°C, respectively. Naturally, it has been inferred that coupling exists between the magnetic parameters like in multiferroic manganites low temperatures. A thorough investigation of properties is therefore line understanding its behaviour. Here, we review epitaxial (001) oriented films grown by different techniques on several substrates. Structural characterization...
Ferroelectric size effects in multiferroic BiFeO3 have been studied using a host of complementary measurements. The structure such epitaxial films has investigated atomic force microscopy, transmission electron and x-ray diffraction. crystal the identified as monoclinic phase, which suggests that polarization direction is close to ⟨111⟩. Such behavior also confirmed by piezoforce microscopy That reveals ferroelectricity down at least 2nm.
In this response, we report the results of additional experiments that bear on issues raised in comment by Eerenstein et al . ([ 1 ][1]) and suggest some possible reasons for they have obtained. In Wang 2 ][2]), reported ferroelectric magnetic
Both intrinsic and extrinsic charge transport properties of methylammonium lead triiodide perovskites are investigated from first-principles. The weak electron-phonon couplings revealed, with the largest deformation potential (~ 5 eV) comparable to that single layer graphene. mobility limited by acoustic phonon scattering is as high a few thousands cm(2) V(-1) s(-1) hole larger than electron mobility. At impurity density 10(18) cm(-3), charged starts dominate lowers 101 72.2 s(-1). warrants...
We consider a partially linear framework for modeling massive heterogeneous data. The major goal is to extract common features across all subpopulations while exploring heterogeneity of each subpopulation. In particular, we propose an aggregation type estimator the commonality parameter that possesses (nonasymptotic) minimax optimal bound and asymptotic distribution as if there were no heterogeneity. This oracle result holds when number does not grow too fast. A plug-in further constructed,...
We investigated the composition-dependent electronic properties of two-dimensional transition-metal dichalcogenide alloys (WxMo1-xS2) based on first-principles calculations by applying supercell method and effective band structure approximation. It was found that hole mass decreases linearly with increasing W composition, electron is always larger than their binary constituents. The different behaviors electrons holes in are attributed to fact metal d-orbitals have contributions conduction...
Two-dimensional (2D) PtSe2 shows the most prominent layer-dependent electrical properties among various 2D materials and high catalytic activity for hydrogen evolution reaction (HER), therefore, it is an ideal material exploring structure-activity correlations in systems. Here, starting with synthesis of single-crystalline a controlled number layers probing HER individual flakes micro electrochemical cells, we investigated from both theoretical experimental perspectives. We clearly...
The successful demonstration of SnSe single crystals as promising thermoelectric materials highlights alternative strategies to nanostructuring for achieving high efficiency. It stimulates us screen the periodic table earth-abundant with layered crystal structures and intrinsically low thermal conductivity. GeAs2 is made from group IV V elements within same period selenium, it exhibits anisotropic anharmonic bonding character similar IV–VI compound SnSe. Here we present a theoretical...
A modified model of metal-semiconductor contacts is applied to analyze the capacitance-voltage and current-voltage characteristics metal-ferroelectric-metal structures. The ferroelectric polarization considered as a sheet surface charge situated at fixed distance from interface. presumable high concentration structural defects acting active electric traps taken into account by introducing deep acceptorlike level. on set metal-Pb(Zr,Ti)O3-metal samples with different Zr∕Ti ratios, deposited...
In this letter we report on the effect of thickness scaling in model PbZr0.2Ti0.8O3(PZT)∕SrRuO3 heterostructures. Although theoretical models for have been widely reported, direct quantitative experimental data ultrathin perovskite (<10nm) films presence real electrodes still not reported. show a systematic study dependence switched polarization (001) epitaxial PZT films, 4to80nm thick. A preliminary based modified Landau Ginzburg approach suggests that nature electrostatics at...
Scaling of the structural order parameter, polarization, and electrical properties was investigated in model ultrathin epitaxial SrRuO3∕PbZr0.2Ti0.8O3∕SrRuO3∕SrTiO3 heterostructures. High-resolution transmission electron microscopy images revealed interfaces to be sharp fully coherent. Synchrotron x-ray studies show that a high tetragonality (c∕a∼1.058) is maintained down 50Å thick films, suggesting indirectly ferroelectricity preserved at such small thicknesses. However, measurement...
We have probed the role of La substitution on ferroelectric properties epitaxial BiFeO3 films SrTiO3-templated Si. This provides a mechanism to engineer rhombohedral distortion in crystal and, thus, control domain structure and switching. With 10% substitution, (Bi0.9La0.1)FeO3 film showed well-saturated hysteresis loops with remanent polarization 45μC∕cm2, converse piezoelectric coefficient d33 45pm∕V, dielectric constant 140. Over this range coercive field systematically decreases such...