A5079334732- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- 2D Materials and Applications
- Ga2O3 and related materials
- Catalysis and Oxidation Reactions
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Advanced Memory and Neural Computing
- Topological Materials and Phenomena
- X-ray Diffraction in Crystallography
- Graphene research and applications
- Crystallization and Solubility Studies
- Odor and Emission Control Technologies
- Semiconductor materials and interfaces
- Quantum Mechanics and Applications
- Industrial Gas Emission Control
- Vehicle emissions and performance
- Magneto-Optical Properties and Applications
- Advanced Photocatalysis Techniques
- Molecular Junctions and Nanostructures
- Quantum Information and Cryptography
- Advanced Condensed Matter Physics
- Surface and Thin Film Phenomena
- Quantum and electron transport phenomena
Rice University
2012-2017
Center for Nanoscale Science and Technology
2014
University of Science and Technology of China
2009
A facile chemical vapor deposition method to prepare single-crystalline VS2 nanosheets for the hydrogen evolution reaction is reported. The electrocatalytic (HER) activities of show an extremely low overpotential −68 mV at 10 mA cm−2, small Tafel slopes ≈34 decade−1, as well high stability, demonstrating its potential a candidate non-noble-metal catalyst HER. As service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed...
Vanadium dioxide (VO2) is a strongly correlated transition metal oxide with dramatic metal–insulator at 67 °C. Researchers have long been interested in manipulating this via the field effect. Here we report attempts to modulate single-crystal VO2 nanowires electrochemical gating using ionic liquids. Stray water contamination liquid leads large, slow, hysteretic conductance responses changes gate potential, allowing tuning of activation energy insulating state. We suggest that these are...
We report measurements of the diffusion atomic hydrogen in single crystalline VO2 micro/nanobeams by direct exposure to hydrogen, without catalyst. The is generated a hot filament, and doping process takes place at moderate temperature (373 K). Undoped has metal-to-insulator phase transition ∼340 K between high-temperature, rutile, metallic low-temperature, monoclinic, insulating with resistance exhibiting semiconductor-like dependence. Atomic hydrogenation results stabilization down 2 K,...
Magnetic moments intercalated into layered transition metal dichalcogenides are an excellent system for investigating the rich physics associated with magnetic ordering in a strongly anisotropic, strong spin-orbit coupling environment. We examine electronic transport and magnetization Fe$_{0.28}$TaS$_{2}$, highly anisotropic ferromagnet Curie temperature $T_{\mathrm{C}} \sim 68.8~$K. find anomalous Hall data confirming dominance of magnetotransport properties this material, remarkably large...
We report modulation of a reversible phase transition in VO2 films by hydrogen doping. A metallic and new insulating are successively observed at room temperature as the doping concentration increases. It is suggested that polarized charges from doped hydrogens play an important role. These gradually occupy V3d-O2p hybridized orbitals consequently modulate filling crystal conduction band-edge states, which eventually evolve into valence states. This demonstrates exceptional sensitivity...
Controlling electronic population through chemical doping is one way to tip the balance between competing phases in materials with strong correlations. Vanadium dioxide exhibits a first-order phase transition at around 338 K high-temperature, tetragonal, metallic state (T) and low-temperature, monoclinic, insulating (M1), driven by electron-electron electron-lattice interactions. Intercalation of VO2 atomic hydrogen has been demonstrated, evidence that this suppresses transition. However,...
Transport measurements on thin films of NdNiO$_3$ reveal a crossover to regime pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution transport properties at temperatures well this appears consistent with gradual formation gap in hole-like Fermi surface strongly correlated system. As $T$ is decreased nominal temperature, becomes increasily non-Ohmic, model Landau-Zener breakdown becoming most suited for describing $I(V)$ characteristics as...
The standard treatment of quantum corrections to semiclassical electronic conduction assumes that charge carriers propagate many wavelengths between scattering events, and succeeds in explaining multiple phenomena (weak localization magnetoresistance (WLMR), universal conductance fluctuations, Aharonov-Bohm oscillations) observed polycrystalline metals doped semiconductors various dimensionalities. We report apparent WLMR fluctuations H x VO2, a poor metal (in violation the Mott-Ioffe-Regel...
The physics of the metal-insulator transition (MIT) in vanadium dioxide remains a subject intense interest. Because complicating effects elastic strain on phase transition, there is interest comparatively strain-free means examining VO2 material properties. We report contact-free, low-strain studies MIT through an inductive bridge approach sensitive to magnetic response powder. Rather than observing expected step-like change susceptibility at we argue that measured dominated by analog...
A laboratory-scale biofilter was used to investigate the potential of for removal sulfide hydrogen and ammonia from waste gases in this study. It took about 40 days start up, at end start-up period, a high efficiency can be obtained. Under steady state operation, decreased with decrease gas retention time (with range 20-60s), but minimum attained still above 82.4% 86.9% ammonia. Microbial analysis demonstrated that non-acidophilic thiobacteria, oxidizing bacteria nitrite were dominant stable...