A5031401543- Electrocatalysts for Energy Conversion
- Nanowire Synthesis and Applications
- Fuel Cells and Related Materials
- Iron oxide chemistry and applications
- Semiconductor materials and interfaces
- ZnO doping and properties
- Conducting polymers and applications
- Advanced battery technologies research
- Heusler alloys: electronic and magnetic properties
- Chalcogenide Semiconductor Thin Films
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Supercapacitor Materials and Fabrication
- Semiconductor Quantum Structures and Devices
- Magnetic Properties and Synthesis of Ferrites
- Advanced Memory and Neural Computing
- Quantum Dots Synthesis And Properties
- Chromium effects and bioremediation
- Adsorption and biosorption for pollutant removal
- Advancements in Battery Materials
- Nanoparticle-Based Drug Delivery
- 2D Materials and Applications
- Heavy metals in environment
- Electron and X-Ray Spectroscopy Techniques
- Machine Learning and ELM
Ravenshaw University
2016-2025
Bridge University
2022
Siksha O Anusandhan University
2022
Sri Sri University
2016-2019
Hokkaido University
2010-2012
Korea Advanced Institute of Science and Technology
2007-2010
Korea Research Institute of Standards and Science
2007-2008
Samsung (South Korea)
2008
Korea Research Institute of Chemical Technology
2007
Korea University
2007
We report vapor-phase synthesis of single-crystalline free-standing Ag nanowires and polarized surface-enhanced Raman scattering (SERS) a single nanowire, as first step toward fabrication well-controlled nanobiosensors employing the SERS technique.
We have observed unusual ferromagnetic properties in single-crystalline CoSi nanowire ensemble, marked contrast to the diamagnetic bulk. High-density freestanding nanowires with B20 crystal structure are synthesized by a vapor-transport-based method. The reaction of cobalt chloride precursor Si substrate produces high-aspect-ratio nanowires. high-resolution transmission electron microscopy and diffraction studies reveal superlattice twice lattice parameter simple cubic lattice....
We have synthesized epitaxial Au, Pd, and AuPd nanowire arrays in vertical or horizontal alignment on a c-cut sapphire substrate. show that the grow from half-octahedral seeds by correlations of geometry orientation seed crystals with those as-grown nanowires. The nanowires can be steered changing atom flux. At low deposition flux grow, while at high grow. Similar vertical/horizontal growth is also demonstrated SrTiO3 substrates. This orientation-steering mechanism visualized molecular...
We report the synthesis of single-crystalline nanowires (NWs) metastable Fe5Si3 phase via an iodide vapor transport method. Free-standing NWs are grown on a sapphire substrate placed Si wafer without use any catalyst. The typical size is 5-15 microm in length and 100-300 nm diameter. Synthesis induced by composition-dependent nucleation from gas-phase reaction. Depending concentration ratio FeI2(g) to SiI4(g), different phases iron silicides formed. growth facilitated initial silicide...
Free-standing CrSi2 nanowires are synthesized by a vapor transport based method for the first time. High-quality with hexagonal cross section produced reaction of CrCl2 precursor and Si substrate without using any metal catalyst. We have studied crystal structure electrical properties nanowires. Transmission electron microscopy X-ray diffraction studies confirm single-crystalline nature C40 type structure. Four-probe devices were fabricated focused ion beam equipped nanomanipulator. Measured...
Electrocatalytic active species like transition metal oxides have been widely combined with carbon-based nanomaterials for enhanced Oxygen Reduction Reaction (ORR) studies because of the synergistic effect arising between different components. The aim present study is to synthesize CeO2/g-C3N4 system and compare ORR activity bare CeO2. Ceria (CeO2) embedded on g-C3N4 nanocomposite was synthesized by a single-step microwave-mediated solvothermal method. This cerium oxide-based displays...
The chemical, structural, and morphological diversity of birnessite, a 2D layered MnO2, has opened avenues for its application as an electrocatalyst toward both the oxygen reduction reaction (ORR) evolution (OER). Among pristine birnessites prepared by different methods, freestanding flakes (primary structure) obtained from molten salt (MS-KMnO) showed remarkable bifunctional activity compared to samples with thicker plates or hierarchical honeycomb-like (type-I secondary morphology. While...
We report the simultaneous and selective synthesis of single-crystalline Co(n)Si NWs (n = 1-3) their corresponding crystal structures--simple cubic (CoSi), orthorhombic (Co(2)Si), face-centered (Co(3)Si)--following a composition change. were synthesized by placing sapphire substrates along temperature gradient. The synthetic process is successful demonstration tuning chemical in NWs. detailed structure Co(2)Si Co(3)Si are reported for first time including bulk nanostructure phases....
Ceria (CeO<sub>2</sub>) nanoparticles with ellipsoid shape are coupled on a nitrogen doped reduced graphene oxide sheet through single step solvothermal procedure.
We report the synthesis of ternary Fe1-xCoxSi nanowires by a vapor transport method. Structural characterization shows single-crystalline nature with B20 crystal structure. Spatially resolved elemental analysis revealed homogeneous distribution all components along nanowire. The nanowire ensemble ferromagnetic properties sudden change in magnetization at applied magnetic field near zero. Magnetoresistance measurements on single-nanowire device show positive magnetoresistance, which does not...
Molecular doping on graphene, through noncovalent functionalization, offers a great opportunity to tune charge density graphene for catalytic applications.
Abstract The persistently increasing energy consumption and the deficiency of conventional fuels have raised serious concern in recent years. advanced conversion technologies like fuel cells been benefitted by development suitable catalytic materials that can effectively carry out appropriate electrochemical processes oxygen reduction reaction (ORR). Direct Methanol Fuel (DMFCs) act as an device efficiency be enhanced with active ORR catalysts. Here, we reported activity Ni doped CeO 2 /rGO...
Vertically grown ZnO nanowires are synthesized on an indium tin oxide (ITO) substrate via a vapor transport method. The arrays of nanowire spontaneously produced from the 1:1 mixture and Zn powders with no metal catalyst. key to this synthetic process lies in covering ITO aluminum foil that has small hole order maintain optimum level supersaturation. Transmission electron microscopy X-ray diffraction confirm single crystalline nature wurtzite nanowires. This is first report vertically...
Abstract Highly selective two electron oxygen reduction pathway to generate hydrogen peroxide using four different rare earth (Pr, Nd, Sm, Gd) oxides has been studied. From the rotating‐ring‐disc electrochemical experimental observations, it can be concluded that among oxides, Gd 2 O 3 shows higher ring current and efficiently produce H (yield of HO − =80 %) following (number electrons involved in process was calculated as 2.2) 0.1 M KOH. The selectivity for improved by synergistic...
In this work, we systematically followed the growth of MnO x nanostructures on trimesic acid (TMA)/benzoic (BA) functionalised nitrogen doped graphene (NG) and studied their electrocatalytic activity towards oxygen reduction reaction (ORR). these hybrid materials phase, morphology Mn surface valency were guided by functional molecules, concentration duration reaction, which in turn significantly affected ORR activity. During presence TMA, agglomerated formed at 2 h transformed to well...
Abstract We report the electrocatalytic activity of nanosized Co 2 Fe‐layered double hydroxide (LDH) on nitrogen doped graphene (NG) hybrid materials toward oxygen evolution reaction (OER). An enhanced trend was observed with increase in amount LDH hybrid. The highest terms onset potential (1.48 V), E j=10 (1.54 and Tafel slope (61 mV/dec) for 75 wt% LDH, which is better than pristine state art RuO . origin enhancement hybrids correlated different electrochemical parameters physical...