A5091545841- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Catalytic Processes in Materials Science
- Topological Materials and Phenomena
- ZnO doping and properties
- Iron-based superconductors research
- Magnetic properties of thin films
- Catalysis and Oxidation Reactions
- Advanced Photocatalysis Techniques
- Multiferroics and related materials
- Electrocatalysts for Energy Conversion
- Diamond and Carbon-based Materials Research
- Gas Sensing Nanomaterials and Sensors
- Graphene research and applications
- Rare-earth and actinide compounds
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Advanced Thermoelectric Materials and Devices
- Copper-based nanomaterials and applications
- Nanomaterials for catalytic reactions
- Ga2O3 and related materials
- TiO2 Photocatalysis and Solar Cells
- Catalysts for Methane Reforming
Xinjiang Institute of Engineering
2024
Xinjiang Medical University
2024
Sixth Affiliated Hospital of Xinjiang Medical University
2024
Rice University
2023-2024
Soochow University
2024
Southwestern University of Finance and Economics
2024
Boston College
2006-2023
University of South China
2022
University of Connecticut
2011-2020
Xi'an Jiaotong University
2017-2019
Multiferroics, defined for those multifunctional materials in which two or more kinds of fundamental ferroicities coexist, have become one the hottest topics condensed matter physics and science recent years. The coexistence several order parameters multiferroics brings out novel physical phenomena offers possibilities new device functions. revival research activities on is evidenced by some discoveries concepts, both experimentally theoretically. In this review, we outline progressive...
Manganese oxides of various structures (α-, β-, and δ-MnO2 amorphous) were synthesized by facile methods. The electrocatalytic properties these materials systematically investigated for catalyzing both oxygen evolution reaction (OER) reduction (ORR) in alkaline media. Extensive characterization was correlated with the activity study investigating crystal (XRD, HRTEM), morphologies (SEM), porosities (BET), surfaces (XPS, O2-TPD/MS), electrochemical (Tafel analysis, Koutechy-Levich plots,...
Polycrystalline BiFeO3 nanoparticles (size 80–120 nm) are prepared by a simple sol–gel technique. Such very efficient for photocatalytic decomposition of organic contaminants under irradiation from ultraviolet to visible frequencies. The also demonstrate weak ferromagnetism about 0.06 μB/Fe at room temperature, in good agreement with theoretical calculations.
The dimensionless thermoelectric figure of merit (ZT) the n-type silicon germanium (SiGe) bulk alloy at high temperature has remained about one for a few decades. Here we report that by using nanostructure approach, peak ZT 1.3 900 °C in an nanostructured SiGe been achieved. enhancement comes mainly from significant reduction thermal conductivity caused enhanced phonon scattering off increased density nanograin boundaries. will make such materials attractive many applications as solar,...
Crystalline mesoporous cobalt oxides with improved catalytic activity in CO oxidation were synthesized using an inverse surfactant micelle method. The prepared materials are monodispersed nanoparticle aggregates, and the mesopores formed by connected intraparticle voids. Powder X-ray diffraction (PXRD), N2 sorption, field emission scanning electron microscope (FE-SEM) high-resolution transmission microscopy (HR-TEM) revealed that both pore sizes enlarged increasing thermal treatment...
Perovskite-type polycrystalline BiFeO3 (BFO) nanowires (∼50nm in diameter and ∼5μm length) were synthesized using the anodized alumina template technique. An energy band gap of ∼2.5eV was determined from UV-visible diffuse reflectance spectrum, its photocatalytic ability to produce O2 revealed under UV irradiation. Weak ferromagnetism at room temperature superparamagnetism low observed for BFO nanowires, different antiferromagnetic order bulk BFO, reflecting significant size effects on...
Efficient bifunctional catalysts for electrochemical oxygen reduction reaction (ORR) and evolution (OER) are highly desirable due to their wide applications in fuel cells rechargeable metal air batteries. However, the development of nonprecious with comparable activities noble metals is still challenging. Here we report a one-step wet-chemical synthesis Ni-/Mn-promoted mesoporous cobalt oxides through an inverse micelle process. Various characterization techniques including powder X-ray...
A series of large scale Mx Co3-x O4 (M=Co, Ni, Zn) nanoarray catalysts have been cost-effectively integrated onto commercial cordierite monolithic substrates to greatly enhance the catalyst utilization efficiency. The monolithically spinel nanoarrays exhibit tunable catalytic performance (as revealed by spectroscopy characterization and parallel first-principles calculations) toward low-temperature CO CH4 oxidation selective cation occupancy concentration, which lead controlled...
Abstract Charge density waves (CDWs) in kagome metals have been tied to many exotic phenomena. Here, using spectroscopic-imaging scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we study the charge order metal ScV 6 Sn . The similarity of electronic band structures TbV (where ordering is absent) suggests that unlikely be primarily driven by Fermi surface nesting Van Hove singularities. In contrast CDW state cousin metals, find no evidence supporting rotation...
We report the formation of solid-state nanopores using a scanning helium ion microscope. The fabrication process offers advantage high sample throughput along with fine control over nanopore dimensions, producing single pores diameters below 4 nm. Electronic noise associated transport through resultant is found to be comparable levels measured on devices made established technique transmission electron microscope milling. demonstrate utility our for biomolecular analysis by measuring passage...
In a material prone to nematic instability, anisotropic strain in principle provides preferred symmetry-breaking direction for the electronic state follow. This is consistent with experimental observations, where nematicity and structural anisotropy typically appear hand-in-hand. this work, we discover that can be locally decoupled from underlying strain-engineered iron-selenide (FeSe) thin films. We use heteroepitaxial molecular beam epitaxy grow FeSe nanoscale network of modulations give...
Abstract The class of A V 3 Sb 5 ( =K, Rb, Cs) kagome metals hosts unconventional charge density wave states seemingly intertwined with their low temperature superconducting phases. nature the coupling between these two and potential presence nearby, competing instabilities however remain open questions. This phenomenology is strikingly highlighted by formation ‘domes’ in transition upon hole-doping CsV . Here we track evolution correlations suppression long-range order first dome into...
Recent experiments showed that the robust charge ordering in manganites can be weakened by reducing grain size down to nanoscale. Weak ferromagnetism was evidenced both nanoparticles and nanowires of charge-ordered manganites. To explain these observations, a phenomenological model based on surface phase separation is proposed. The relaxation superexchange interaction layer allows formation ferromagnetic shell, whose thickness increases with decreasing size. Possible exchange bias softening...
The tubule formation process from amorphous carbon nanowires under high-bias-caused Joule heating was observed in real time a high-resolution transmission electron microscope. crystallization of the occurred two distinct ways: tubular graphitic basal planes parallel to nanowire axis on surface and nano-onions interior nanowire. mechanism is solid-state atom diffusion at high temperatures. Energetically, caused by exceptionally low energy (0002) plane graphite. Higher input power generally...
The diffusion and spatial distribution of tin from solder, nickel barrier in p-type (Bi,Sb)2Te3 n-type Bi2(Te,Se)3 thermoelectric materials were investigated using electron microscopy. results indicate that is a suitable diffusion-barrier material for both Bi2(Te,Se)3. However, even though it not an issue the (Bi,Sb)2Te3, diffuses several microns into during soldering processing degrades its performance. Diffusion coefficients also quantitatively studied.
A new type of noble metal-free catalytic honeycomb has been successfully developed by rational assembly hierarchical Co3O4 nano-arrays on three dimensional ceramic substrates. Different cobalt precursors were found to induce different fashions for nano-array growth. growth mechanisms including "dumbbell aggregation" and "elongation–splitting" have proposed interpret the morphology evolution. The based honeycombs exhibit high performance NO oxidation with conversion efficiency as 80% at 275...
Significance Charge density waves (CDWs) are simple periodic reorganizations of charge in a crystal, and yet they still poorly understood continue to bear surprises. External perturbations, such as strain or pressure, can principle push CDW phase into different ordering geometry. However, engineering this type quantum criticality has been experimentally challenging. Here, we implement method for straining bulk materials. By applying it 2H -NbSe 2 , prototypical system studied decades,...
The kagome superconductor family AV3Sb5 (A=Cs, K, Rb) emerged as an exciting platform to study exotic Fermi surface instabilities. Here, we use spectroscopic-imaging scanning tunneling microscopy (SI-STM) and angle-resolved photoemission spectroscopy (ARPES) reveal how the surprising cascade of higher- lower-dimensional density waves in CsV3Sb5 is intimately tied a set small reconstructed pockets. ARPES measurements visualize formation these pockets generated by 3D charge wave transition....
Active, robust, and low-cost catalysis is a key component for the commercialization of efficient catalysts. The development effective strategies synthesis processing bimetallic nanoparticles with controllable size composition an important approach to catalyst preparation. In this paper, noble metal catalyzed chemical growth process has been developed. Nearly monodispersed NiPt hollow spheres ultrathin shell (2–3 nm) have successfully synthesized. Size nanospheres conveniently tuned by...