A5041829809- Ferroelectric and Piezoelectric Materials
- Graphite, nuclear technology, radiation studies
- Microwave Dielectric Ceramics Synthesis
- Advanced Thermoelectric Materials and Devices
- Nuclear and radioactivity studies
- Fusion materials and technologies
- Chalcogenide Semiconductor Thin Films
- Advancements in Battery Materials
- Multiferroics and related materials
- Radiation Shielding Materials Analysis
- 2D Materials and Applications
- Thermal Radiation and Cooling Technologies
- Glass properties and applications
- Acoustic Wave Resonator Technologies
- Perovskite Materials and Applications
- X-ray Diffraction in Crystallography
- Dielectric properties of ceramics
- Advanced Photocatalysis Techniques
- Advanced ceramic materials synthesis
- Quantum Dots Synthesis And Properties
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Materials and Technologies
- Phase-change materials and chalcogenides
- Thermal properties of materials
- Electrowetting and Microfluidic Technologies
Boise State University
2013-2025
Micron (United States)
2018-2025
Micron Biomedical (United States)
2025
St. Joseph’s College of Engineering
2016
St. Joseph's Institute of Technology
2016
Center for Advanced Energy Studies
2011-2015
Indian Institute of Technology Madras
2013
Rensselaer Polytechnic Institute
2008-2012
Indian Institute of Science Bangalore
2004-2010
We demonstrate a tunable bandgap from 2.32 eV to 2.09 in phase-pure BiFeO3 by controlling the particle size 65 nm 5 nm. Defect states due oxygen and microstrain show strong dependence on have significant effect shape of absorbance curves. Oxygen-defect induced undercoordinated surface nanoparticles are demonstrated via HRTEM XPS studies. Microstrain lattice leads reduction rhombohedral distortion for sizes below 30 The decrease band gap with decreasing is attributed competing effects...
Abstract Printing is a versatile method to transform semiconducting nanoparticle inks into functional and flexible devices. In particular, thermoelectric nanoparticles are attractive building blocks fabricate devices for energy harvesting cooling applications. However, the performance of printed plagued by poor interfacial connections between resulting low carrier mobility. While many rigid bulk materials have shown figure merit ZT greater than unity, it an exacting challenge develop with...
Many promising attributes of ZnO nanoparticles (nZnO) have led to their utilization in numerous electronic devices and biomedical technologies. nZnO fabrication methods can create a variety intrinsic defects that modulate the properties nZnO, which be exploited for various purposes. Here we developed new synthesis procedure controls certain pure are theorized contribute n-type conductivity material. Interestingly, this created reduced nanoparticle band gap ∼3.1 eV generated strong emissions...
Antimony selenide is a promising thermoelectric material with high Seebeck coefficient, but its figure of merit limited by low electrical conductivity. Here, we report rapid and scalable (gram-a-minute) microwave synthesis one-dimensional nanocrystals sulfurized antimony that exhibit ∼104−1010 times higher conductivity than non-nanostructured bulk or thin film forms this material. As the nanocrystal diameter increases, nanowires transform into nanotubes through void formation coalescence...
Abstract This article reports the microstructural characteristics of various petroleum and pitch based nuclear graphites (IG-110, NBG-18, PCEA) that are interest to next generation plant program. Bright-field transmission electron microscopy imaging was used identify understand different features constituting microstructure graphite such as filler particles, microcracks, binder phase, rosette-shaped quinoline insoluble (QI) chaotic structures, turbostratic phase. The dimensions microcracks...
Chalcogenide nanostructures offer promise for obtaining nanomaterials with high electrical conductivity, low thermal and Seebeck coefficient. Here, we demonstrate a new approach of tuning the coefficient nanoplate assemblies single-crystal pnictogen chalcogenides by heterostructuring nanoplates tellurium nanocrystals. We synthesized bismuth telluride antimony decorated nanorods nanofins using rapid, scalable, microwave-stimulated organic surfactant-directed technique. Heterostructuring...
We demonstrate a microprobe technique that can simultaneously measure thermal conductivity κ and Seebeck coefficient α of thin films. In this technique, an alternative current joule-heated V-shaped microwire serves as heater, thermometer voltage electrode, locally heats the film when contacted with surface. The is extracted from resistance measured between probe unheated regions by modeling heat transfer in probe, sample their contact area, calibrations standard reference samples....
We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles. The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle increases. presence pseudo-cubic symmetry evidenced these Raman spectral studies suggest straightening Fe-O-Fe bond angle accompanied by in FeO6 octahedral rotation d 65 nm. magnetization dip around nm, half spin cycloid length BiFeO3, due rhombohedral...
In this paper, the magnetic and electrocatalytic properties of hydrothermally grown transition metal doped (10% Co, Ni, Fe, Mn) 2H-MoS2 nanocrystals (NCs) with a particle size 25–30 nm are reported. The pristine NCs showed mixture canted anti-ferromagnetic ferromagnetic behavior. While Fe MoS2 revealed room temperature ferromagnetism, Mn paramagnetism, predominantly. ground state all materials is found to be canted-antiferromagnetic phase. To study performance for hydrogen evolution...
Thermoelectric generators are an environmentally friendly and reliable solid-state energy conversion technology. Flexible low-cost thermoelectric especially suited to power flexible electronics sensors using body heat or other ambient sources. Bismuth telluride based materials exhibit their best performance near room temperature making them ideal candidate wearable heat. In this report Bi2Te3 thin films deposited on a polyimide substrate scalable manufacturing methods. The synthesized...
P2-type layered oxides have attracted tremendous attention as the leading candidate for cathode material in Na-ion batteries owing to their ease of synthesis and facile diffusion. In this work, an in-depth investigation electrochemical behavior (space group P63/mmc) 10% Ti-doped Na2/3Mn2/3Ni1/3O2 is carried out different voltage ranges (1.5–4.0 V, 2.0–4.0 2.0–4.5 V). Ti4+ doping found disrupt Na-ion/vacancy ordering increase Na–O2 layer spacings, which results improved rate performance (∼68...
ABSTRACT This study systematically investigates an Mn‐Fe‐Ni pseudo‐ternary system for Na(Mn‐Fe‐Ni)O 2 cathodes, focusing on the effects of varying transition metal fractions structural and electrochemical properties. X‐ray diffraction reveals that increasing Mn content induces biphasic behavior. A higher Ni reduces c parameter, while Fe concentrations expand lattice. Average particle size increases with increase in Fe/Ni ratio. NaMn 0.500 0.125 0.375 O delivers a high specific capacity ~149...
The effect of Ca 2+ substitution on the structure, microstructure, and microwave dielectric properties Sr–gehlenite ( Sr 2 Al SiO 7 ) ceramic has been investigated. structure microstructure 2− x ceramics were analyzed via X‐ray diffraction XRD as well scanning transmission electron microscopic techniques. While end‐members = 0 2) form isostructural compounds, a highly defective, nonstoichiometric, ‐rich secondary phase was observed bright‐field microscopy energy dispersive X ‐ray...
We report the synthesis and properties of sphere-shaped microscale aggregates bismuth telluride nanoplates. obtain porous microspheres by reducing chloride orthotelluric acid with hydrazine in presence thioglycolic acid—which serves as shape-and size-directing agent—followed room-temperature aging—which promotes nanoplate aggregation. Thin film assemblies exhibit n-type behavior due to sulfur doping a Seebeck coefficient higher than that reported for chalcogenide nanostructures. Adaptation...