A5071336925- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Thermoelectric Materials and Devices
- Advancements in Battery Materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Advanced Battery Materials and Technologies
- Electronic and Structural Properties of Oxides
- Advanced Sensor and Energy Harvesting Materials
- Iron-based superconductors research
- Multiferroics and related materials
- Superconductivity in MgB2 and Alloys
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Topological Materials and Phenomena
- Advanced battery technologies research
- Conducting polymers and applications
- Boron and Carbon Nanomaterials Research
- Pickering emulsions and particle stabilization
- Corporate Taxation and Avoidance
- Graphene research and applications
- Surface and Thin Film Phenomena
- Magnetism in coordination complexes
University of Wollongong
2014-2024
Sabzevar University of Medical Sciences
2010
ARC Centre of Excellence for Electromaterials Science
2010
Tokyo Institute of Technology
2003
Vilnius University
2002
ZnO is a promising high figure-of-merit (ZT) thermoelectric material for power harvesting from heat due to its melting point, electrical conductivity σ, and Seebeck coefficient α, but practical use limited by lattice thermal κ(L). Here, we report Al-containing nanocomposites with up factor of 20 lower κ(L) than non-nanostructured ZnO, while retaining bulklike α σ. We show that enhanced phonon scattering promoted Al-induced grain refinement ZnAl(2)O(4) nanoprecipitates presages ultralow κ ∼ 2...
For practical sodium-ion batteries, both high electrochemical performance and cost efficiency of the electrode materials are considered as two key parameters. Prussian blue analogues (PBAs) broadly recognized promising cathode due to their low cost, theoretical capacity, cycling stability, although they suffer from low-crystallinity-induced deterioration. Herein, a facile "ice-assisted" strategy is presented prepare highly crystallized PBAs without any additives. By suppressing structure...
Sodium-ion batteries (SIBs) with fast-charge capability and long lifespan could be applied in various sustainable energy storage systems, from personal devices to grid storage. Inspired by the disordered Rubik's cube, here, we report that high-entropy (HE) concept can lead a very substantial improvement sodium properties of hexacyanoferrate (HCF). An example HE-HCF has been synthesized as proof concept, which achieved impressive cycling stability over 50 000 cycles an outstanding...
Abstract Layered transition metal oxide (Na x TMO 2 ), being one of the most promising cathode candidates for sodium‐ion batteries (SIBs), have attracted intensive interest because their nontoxicity, high theoretical capacities, and easy manufacturability. However, physical electrochemical properties water sensitivity, sluggish Na + transport kinetics, irreversible multiple‐phase translations hinder practical application. Here, a concept surface lattice‐matched engineering is proposed based...
We report that the $(\text{Ba},\text{K}){\text{Fe}}_{2}{\text{As}}_{2}$ crystal with ${T}_{c}=32\text{ }\text{K}$ shows a pinning potential, ${U}_{0}$, as high ${10}^{4}\text{ }\text{K}$, ${U}_{0}$ showing very little field dependence. The single crystals become isotropic at low temperatures and magnetic fields, resulting in rigid vortex lattice, even fields close to ${\text{H}}_{c2}$. vortices observed two-dimensional (2D) distinguish this compound from 2D high-${T}_{c}$ cuprate...
Silicene monolayers grown on Ag(111) surfaces demonstrate a band gap that is tunable by oxygen adatoms from semimetallic to semiconducting type. By using low-temperature scanning tunneling microscopy, it found the adsorption configurations and amounts of silicene surface are critical for band-gap engineering, which dominated different buckled structures in R13xR13, 4x4, 2R3x2R3 layers. The Si-O-Si bonds most energy-favored species formed under oxidation, verified in-situ Raman spectroscopy...
Electrical communication between a biological system and outside equipment allows one to monitor influence the state of tissue nervous networks. As bridge, bioelectrodes should possess both electrical conductivity adaptive mechanical properties matching target soft biosystem, but this is still big challenge. A family liquid-metal-based magnetoactive slurries (LMMSs) formed by dispersing magnetic iron particles in Ga-based liquid metal (LM) matrix reported here. The properties, viscosity,...
An efficient procedure for the fabrication of highly conductive carbon nanotube/graphene hybrid yarns has been developed. To start, arrays vertically aligned multi‐walled nanotubes (MWNT) are converted into indefinitely long MWNT sheets by drawing. Graphene flakes then deposited onto electrospinning to form a composite structure that is transformed yarn filaments twisting. The process scalable on an industrial scale. Prepared materials characterized electron microscopy, electrical,...
The development of cost-efficient, long-lifespan, and all-climate sodium-ion batteries is great importance for advancing large-scale energy storage but plagued by the lack suitable cathode materials. Here, we report low-cost Na-rich Mn-based Prussian blue analogues with superior rate capability ultralong cycling stability over 10,000 cycles via structural optimization electrochemically inert Ni atoms. Their thermal stability, properties, potential in full cells are investigated detail....
Observations on colossal electroresistance (ER) and giant magnetoresistance in doped PbPdO2, one of the candidates a new class materials, spin gap-less semiconductors, are reported. The resistivity is strongly suppressed by electrical current below metal-insulator transition with ER values up to 107, which much greater than that achieved materials.
The synthesis and characterization of polycrystalline room-temperature ferromagnetic semiconductor (In0.9Fe0.1−xMnx)2O3 (x=0–0.1) oxide are reported. All the samples with intermediate x values at room temperature. highest saturation magnetization moment 300K per total amount magnetic ion is reached in (In0.9Fe0.04Mn0.06)2O3 sample. lattice constant a increases linearly increasing Mn content. Fe-only doped were paramagnetic, while Mn-only sample was found to be below TC=46K.
Observation of high temperature ferromagnetism in Ni-doped In2O3 and indium-tin-oxide (ITO) samples prepared by a solid state synthesis route is reported. Both compounds showed clear above 300K with the magnetic moments 0.03–0.06μB∕Ni 0.1μB∕Ni at 300 10K, respectively. typical semiconducting behavior room resistivity ρ∼2Ωcm, while ITO were metallic ρ∼2×10−2Ωcm. Analysis different conduction mechanisms suggested that variable range hopping model explains our ρ-T data for sample best.
Synthesis and characterization of bulk NaxCoO2 samples substituted by K Rb is reported. Phase formation studies revealed a narrow stable region for Na-alkali metal-Co system. Whisker platelike single crystalline structures have been found to form on the surface pellets in case doping. All were metallic no characteristic anomaly R-T curves was observed doped sample. Magnetoresistance measured has pronounced positive response only K-doped pure phases, reaching 11% 7% at 5 temperature, respectively.
Hybrid polypyrrole (PPy)-multi walled carbon nanotube (MWNT) yarns were obtained by chemical and electrochemical polymerization of pyrrole on the surface within porous interior twisted MWNT yarns. The material was characterized scanning electron microscopy, electrochemical, mechanical electrical measurements. It found that hybrid PPy-MWNT possessed significantly higher strength (over 740 MPa) Young's modulus 54 GPa) than pristine yarn. also exhibited substantially conductivity 235 S cm(-1))...
YF<sub>3</sub>:Yb, Tm@BiOCl possesses epitaxial heterostructure, which can quantitatively activate multiple energy transfer channels including excited-state and fluorescence reabsorption, then promote the NIR-driven photocatalytic properties.
The mechanical and the electrical properties of polypyrrole (PPy) fibers electrochemically deposited PPy films were studied. It was found that showed a significantly higher strength than due to better orientation molecular structure. prepared had conductivity at high temperature. At low temperature, conductivity. results analyzed in frame three-dimensional variable range hopping model. room temperature average distance for about 4 Å while it increases 5.7 Å. This corresponds 1 2 monomer...
The synthesis and characterization of a carbon (C) doped polycrystalline MgB2 superconductor is reported with tartaric acid (C4H6O6) used as the C source. amount C4H6O6 varied between 5 30 wt%. Relationships microstructures, critical current density (Jc), temperature (Tc), upper field (Hc2), irreversibility (Hirr) for 0–30 wt% are systematically studied. A reduction in Tc from 37.65 to 34.45 K lattice parameter due substitution occurs doping. Jc, Hc2, Hirr significantly enhanced an...
The tetrabutylammonium complex with a 2:5 stoichiometry, (n-Bu(4)N)(2)(TCNQ)(5), has been prepared and structurally characterized by X-ray crystallography. Diagnostic bands in the Raman spectrum signature features electrochemistry confirm that TCNQ moieties are partially charged solid state. EPR, magnetic susceptibility, electrical conductivity measurements all consistent (n-Bu(4)N)(2)(TCNQ)(5) behaving as quasi-one-dimensional organic semiconductor.