A5083454718- Nanowire Synthesis and Applications
- Advanced Thermoelectric Materials and Devices
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- GaN-based semiconductor devices and materials
- Thermal properties of materials
- Solar-Powered Water Purification Methods
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Semiconductor materials and interfaces
- Advanced Sensor and Energy Harvesting Materials
- TiO2 Photocatalysis and Solar Cells
- Semiconductor Quantum Structures and Devices
- Advancements in Battery Materials
- Risk and Safety Analysis
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Advanced Battery Materials and Technologies
- Molecular Junctions and Nanostructures
- Thermal Radiation and Cooling Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Electronic and Structural Properties of Oxides
Texas A&M University
2014-2025
Mary Kay (United States)
2018-2024
Mitchell Institute
2012-2023
O’Connor Hospital
2023
Texas A&M University System
2018-2022
Massachusetts Institute of Technology
2007-2010
University of Louisville
2003-2009
Mountain View College
2009
Moscow Institute of Thermal Technology
2009
Istanbul Technical University
2009
Metal foils convert to metal oxide nanowires at ∼50–300 °C when oxidized using weakly ionized, highly dissociated oxygen plasmas in an inductively coupled RF system (see Figure). The mechanism is believed involve spontaneous nucleation of nanocrystals (due supersaturation the subsurface layers foil with O2) followed by basal attachment limited mobility low temperatures), leading rapid nanowire growth. Supporting information for this article available on WWW under...
We report near-infrared lasing in the telecommunications band gallium antimonide semiconductor subwavelength wires. Our results open possibility of use subwavelength-wire lasers future photonic integrated circuits for applications.
Indium nitride (InN) nanowire synthesis using indium (In) vapor transport in a dissociated ammonia environment (reactive transport) is studied detail to understand the nucleation and growth mechanisms involved with so-called "self-catalysis" schemes. The results show that of InN crystal occurs first on substrate. Later, In droplets are formed top crystals because selective wetting onto crystals. Further via liquid-phase epitaxy through leads one dimension (1D), resulting formation nanowires....
A scalable and versatile method for the large-scale synthesis of tungsten trioxide nanowires their arrays on a variety substrates, including amorphous quartz fluorinated tin oxide, is reported. The involves chemical-vapor transport metal oxide vapor-phase species using air or oxygen flow over hot filaments onto substrates kept at distance. results show that density can be varied from 10(6)-10(10) cm(-2) by varying substrate temperature. diameter ranges 100-20 nm. also variations in...
Poly(3,4-ethylenedioxythiophene) (PEDOT) thin films were obtained through oxidative chemical vapor deposition (oCVD) by using a new oxidant—bromine. The use of bromine eliminates any post processing rinsing step required with other oxidants like iron chloride and hence makes the process completely dry. Film properties are further compared PEDOT deposited as oxidant. Accelerated aging experiments show longer retention electrical conductivity for Conductivities high 380 S/cm oxidant at 80 °C,...
The progress on sodium‐ion battery technology faces many grand challenges, one of which is the considerably lower rate sodium insertion/deinsertion in electrode materials due to larger size (Na) ions and complicated redox reactions compared lithium‐ion systems. Here, it demonstrated that can be reversibly stored Zn‐Sb intermetallic nanowires at speeds exceed 295 nm s −1 . Remarkably, these values are three orders magnitude higher than sodiation other electrochemically tested with situ...
We utilized time-integrated and time-resolved photoluminescence of a-axis c-axis gallium nitride nanowires to elucidate the origin blue-shifted ultraviolet in GaN relative nanowires. attribute this emission from surface trap states as opposed previously proposed causes such strain effects or built-in polarization. These results demonstrate importance accounting for when considering optoelectronic devices based on
Deployment of photocatalysis for water disinfection necessitates engineering the process kinetics and achieving complete recovery photocatalyst following remediation water. The photocatalysts, especially nanostructured remains a challenge, as indicated by previous study our group where only 57% TiO2 nanowires were recovered gravity-assisted settling sedimentation from after its photocatalysis-assisted E. coli inactivation. To overcome this novel method involving use photocatalysts in form...
A concept is presented for synthesizing metal nanowires directly from the vapor phase using chemical transport to temperatures higher than corresponding oxide decomposition temperature. Specifically, this demonstrated with synthesis of tungsten sizes ranging 70 40 nm by increasing condensation The simultaneous and species during nucleation growth suggested 1-D metallic nanowires. This could potentially be extended several other nonvolatile refractory metals. find potential applications in...
Conducting polymer-metal nanoparticle hybrids, fabricated by assembling metal nanoparticles on top of functionalized conducting polymer film surfaces using conjugated linker molecules, enable the selective sensing volatile organic compounds (VOCs). In these selectivity is achieved different metals same film. This eliminates need to develop either polymers chemistries or device configurations for each specific analyte. chemisorption analyte vapor induces charge redistribution in and changes...
Synthesis of nanowires Group III antimonides (GaSb and InSb) is studied in detail using two approaches: (i) direct antimonidization metal droplets (ii) reactive vapor transport metals the presence antimony phase. The diameter GaSb ranged from 30 to 700 nm length a few hundreds micrometers. as long 1 millimeter have been synthesized large (several millimeters) sized gallium droplets. Reactive phase led formation homoepitaxially oriented nanowire arrays on top crystals. In case InSb,...
Abstract A method for the preparation of COOH functionalized conducting copolymer films; toward ultimate goal developing resistance‐based sensing platforms, is presented. The involved vapor phase copolymerization pyrrole with a monomer containing functionality, thiophene‐3‐acetic acid (TAA). This strategy aided in avoiding need to employ brittle poly(thiophene‐3‐acetic acid) (PTAA) films applications. In this strategy, variation gas feed ratio TAA allowed composition film and further both...
A novel method for the fabrication of carbon nanotube (CNT)−conducting polymer composites is demonstrated by conformally coating extremely high aspect ratio vertically aligned-CNT (A-CNT) arrays with conducting via oxidative chemical vapor deposition (oCVD). mechanical densification technique employed that allows spacing A-CNTs to be controlled, yielding a range inter-CNT distances between 20 and 70 nm. Using this morphology control, oCVD shown coat 8-nm-diameter CNTs having array heights up...
The deployment of photocatalysis for remediation water has not yet been realized, although laboratory-scale studies have demonstrated promise. Accomplishing this requires the development as a process, including studying its efficiencies in remedying when high volumes are processed, and addressing recovery, possible regeneration reuse photocatalysts. To that end, work is aimed at demonstrating use custom-built mobile platform disinfecting large quantities water. benchtop built capable...
We report a facile, room temperature synthesis of PbS, PbSe, PbSxSe1–x, and PbTe nanoparticles their microscale assemblies by combining chalcogen solution lead halide in select thiol–amine mixtures. Selection an appropriate pair and/or the use amine to thiol ratio has demonstrated size control on nanoparticle self-assemblies ranging from nano- microscale. Proper washing these particles yielded phase-pure compositionally uniform material with minimal or no presence any carbonaceous ligands...
Recent studies focusing on enhancing the thermoelectric performance of metal oxides were primarily motivated by their low cost, large availability component elements in earth's crust, and high stability. So far, these indicate that n-type materials, such as ZnO, have much lower than p-type counterparts. Overcoming this limitation requires precisely tuning thermal electrical transport through oxides. One way to accomplish is use optimally doped bulk assemblies ZnO nanowires. In study,...
Research on thermoelectrics has seen a huge resurgence since the early 1990s. The ability of tuning material's electrical and thermal transport behavior upon nanostructuring led to this revival. Nevertheless, thermoelectric performances nanowires related materials lag far behind those achieved with thin-film superlattices quantum dot-based materials. This is despite fact that offer many distinct advantages in enhancing simplicity strategy first foremost advantage. For example, control...