A5002709382- Transition Metal Oxide Nanomaterials
- Advancements in Battery Materials
- Graphene research and applications
- Carbon Nanotubes in Composites
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Advanced Memory and Neural Computing
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Crystallization and Solubility Studies
- ZnO doping and properties
- X-ray Diffraction in Crystallography
- Chalcogenide Semiconductor Thin Films
- Fullerene Chemistry and Applications
- Catalysis and Oxidation Reactions
- Surface Modification and Superhydrophobicity
- Advanced battery technologies research
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Perovskite Materials and Applications
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Copper-based nanomaterials and applications
Texas A&M University
2016-2025
ETH Zurich
2024-2025
Paul Scherrer Institute
2024-2025
Hamad bin Khalifa University
2024
Mitchell Institute
2015-2023
College Station Medical Center
2015-2021
University of Illinois Chicago
2017
Shanghai Research Institute of Materials
2017
Shanghai University
2017
Michigan Technological University
2017
A systematic study of the zeta (ζ)-potential distribution surfactant-wrapped individual single-walled carbon nanotubes (SWNTs) dissolved in water is presented here. The surface charge on SWNT micelles, as measured by ζ-potential, has implications for stability dispersions and electrophoretic dielectrophoretic assembly alignment SWNTs. Very highly charged SWNTs are obtained dispersing high concentrations anionic cationic surfactants, whereas almost neutral using non-ionic surfactants....
The formation of silver nanoparticles (AgNPs) via reduction ions (Ag+) in the presence humic acids (HAs) under various environmentally relevant conditions is described. HAs tested originated from Suwannee River (SUW), and included samples three sedimentary (SHAs), five soils obtained across state Florida. time required to form AgNPs varied depending upon type concentration HA, as well temperature. SUW all SHAs reduced Ag+ at 22 °C. However, none soil formed absorbance-detectable room...
We demonstrate the growth of dendritic magnesium deposits with fractal morphologies exhibiting shear moduli in excess values for polymeric separators upon galvanostatic electrodeposition metallic Mg from Grignard reagents symmetric Mg–Mg cells. Dendritic is understood on basis competing influences reaction rate, electrolyte transport and self-diffusion barrier.
A facile, rapid, and scalable electrophoretic deposition approach is developed for the fabrication of large-area chemically derived graphene films on conductive substrates based oxide reduced components. Two distinctive approaches fabricating conformal are developed. In first approach, sheets electrophoretically deposited from an aqueous solution after oxidation graphite to subsequent exfoliation oxide. Next, via dip-coating in hydrazine. second nanosheets a strongly alkaline directly onto...
Solar water splitting has emerged as an urgent imperative hydrogen emerges increasingly important form of energy storage. g-C3N4 is ideal candidate for photocatalytic a result the excellent alignment its band edges with redox potentials. To mitigate electron-hole recombination that limited performance g-C3N4, we have developed semiconductor heterostructure CuFe2O4 nanoparticles (NPs) highly efficient photocatalyst. Visible-light-driven properties CuFe2O4/g-C3N4 heterostructures different...
Oxidized single-walled carbon nanotubes (SWNTs) have been reacted with cadmium selenide (CdSe) nanocrystals, capped mercaptothiol derivatives, as well titanium dioxide (TiO2) functionalized 11-aminoundecanoic acid to form nanoscale heterostructures, characterized by transmission electron microscopy and infrared spectroscopy. The reaction acid-terminated CdSe nanocrystals tubes was facilitated the aid of intermediary linking agents, such ethylenediamine semicarbazide, in an amide-forming...
Whereas the chemistry of fullerenes is well-established, single-walled carbon nanotubes (SWNTs) a relatively unexplored field research. Investigations into bonding moieties onto SWNTs are important because they provide fundamental structural insight how nanoscale interactions occur. Hence, understanding SWNT becomes critical to rational, predictive manipulation their properties. Among strategies discussed include molecular metal complexation with control site-selective in these systems. In...
Single-crystalline perovskite nanostructures with reproducible shape have been prepared using a simple, readily scaleable solid-state reaction in the presence of NaCl and nonionic surfactant. Pristine BaTiO3 nanowires diameters ranging from 50 to 80 nm an aspect ratio larger than 25. SrTiO3 nanocubes mean edge length produced similar procedure.
A dispersion of raw HiPco single-walled carbon nanotubes in methanol has been subjected to ozonolysis at −78 °C, followed by treatment with various reagents, independent runs, generate a higher proportion carboxylic acid/ester, ketone/aldhehyde, and alcohol groups, respectively, on the nanotube surface. This protocol found purify removing amorphous metal impurities. More importantly, as had theoretically predicted, reaction sequence ozonize (and hence, oxygenate) sidewalls these nanotubes,...
Traditionally, SWNTs have been prepared by electric arc-discharge, laser ablation, or chemical vapor deposition (CVD) methods, yielding tubes of various diameter and length distributions. However, without exception, as-prepared are contaminated with a number impurities, decreasing the overall yield usable material. Impurities include transition metal catalysts, such as Fe, Co, Ni, which necessary for growth well carbonaceous species amorphous carbon, fullerenes, multishell carbon...
The first-order metal—insulator phase transition in VO2 is characterized by an ultrafast several-orders-of-magnitude change electrical conductivity and optical transmittance, which makes this material attractive candidate for the fabrication of limiting elements, thermochromic coatings, Mott field-effect transistors. Here, we demonstrate that phase-transition temperature hysteresis can be tuned scaling to nanoscale dimensions. A simple hydrothermal protocol yields anisotropic free-standing...
The organic capping ligands used in the colloidal synthesis of CdSe nanorods have a profound impact on nanorod shape, dimensions, and structure as is shown here by varying length alkylphosphonic acid synthesis. shorter ligand, more elongated branched are resulting nanorods; when mixtures acids used, higher molar fraction nanorods. 31P 1H nuclear magnetic resonance (NMR) studies indicate that preferentially remain surfaces phosphonic during Optical transmission spectroscopy shows decreased...
This study investigated the possible natural formation of silver nanoparticles (AgNPs) in Ag(+)-fulvic acid (FA) solutions under various environmentally relevant conditions (temperature, pH, and UV light). Increase temperature (24-90 °C) pH (6.1-9.0) Ag(+)-Suwannee River fulvic (SRFA) accelerated appearance characteristic surface plasmon resonance (SPR) AgNPs. The rate AgNP via reduction Ag(+) presence different FAs (SRFA, Pahokee Peat acid, PPFA, Nordic lake NLFA) Suwannee humic (SRHA)...
The peculiarities in the electronic structure of seemingly simple binary vanadium oxide VO2, as manifested a pronounced metal−insulator phase transition proximity to room temperature, have made it subject extensive theoretical and experimental investigations over last several decades. We review some recent advances treatments strongly correlated systems along with ultrafast measurements VO2 samples that provide unprecedented mechanistic insight into nature transition. Scaling nanoscale...
The influence of finite size in altering the phase stabilities strongly correlated materials gives rise to interesting prospect achieving additional tunability solid–solid transitions such as those involved metal–insulator switching, ferroelectricity, and superconductivity. We note here some distinctive effects on relative insulating (monoclinic) metallic (tetragonal) phases solid-solution WxV1−xO2. Ensemble differential scanning calorimetry individual nanobelt electrical transport...
Abstract The rapid insertion and extraction of Li ions from a cathode material is imperative for the functioning Li-ion battery. In many materials such as LiCoO 2 , lithiation proceeds through solid-solution formation, whereas in other LiFePO 4 lithiation/delithiation accompanied by phase transition between Li-rich Li-poor phases. We demonstrate using scanning transmission X-ray microscopy (STXM) that individual nanowires layered V O 5 gradients observed on intercalation arise electron...
Galvanostatic electrodeposition from Grignard reagents in symmetric Mg–Mg cells is used to map Mg morphologies fractal aggregates of 2D nanoplatelets highly anisotropic dendrites with singular growth fronts and entangled nanowire mats.
The scarce inventory of compounds that allow for diffusion multivalent cations at reasonable rates poses a major impediment to the development intercalation batteries. Here, we contrast thermodynamics and kinetics insertion Li, Na, Mg, Al ions in two synthetically accessible metastable phases V2O5, ζ- ε-V2O5, with relevant parameters thermodynamically stable α-phase V2O5 using density functional theory calculations. metastability frameworks results higher open circuit voltage ions, exceeding...
Organic metal halide perovskites have rapidly emerged as among the leading candidates for next generation of photovoltaic and light-emitting devices. The band gap, exciton binding energy, absorption cross-section these materials are tunable to some extent by compositional variation. Dimensional confinement represents an attractive alternative variation tuning properties via quantum close Böhr radius. While stabilization few-layered nanoplatelets methylammonium lead bromide has recently been...
The known crystal structures of solids often correspond to the most thermodynamically stable arrangement atoms. Yet, oftentimes there exist a richly diverse set alternative structural arrangements that lie at only slightly higher energies and can be stabilized under specific constraints (temperature, pressure, alloying, point defects). Such metastable phase space holds tremendous opportunities for nonequilibrium motifs distinctive chemical bonding ultimately realization novel function. In...
The invention of rechargeable batteries has dramatically changed our landscapes and lives, underpinning the explosive worldwide growth consumer electronics, ushering in an unprecedented era electric vehicles, potentially paving way for a much greener energy future. Unfortunately, current battery technologies suffer from number challenges, e.g., capacity loss failure upon prolonged cycling, limited ion diffusion kinetics, rather sparse palette high-performing electrode materials. Here, we...