A5035953325- ZnO doping and properties
- Conducting polymers and applications
- Graphene research and applications
- Advanced Photocatalysis Techniques
- Advanced Sensor and Energy Harvesting Materials
- Electrospun Nanofibers in Biomedical Applications
- Copper-based nanomaterials and applications
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Ga2O3 and related materials
- Electronic and Structural Properties of Oxides
- Perovskite Materials and Applications
- 2D Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Carbon Nanotubes in Composites
- TiO2 Photocatalysis and Solar Cells
- Graphene and Nanomaterials Applications
- Analytical Chemistry and Sensors
- Quantum and electron transport phenomena
- GaN-based semiconductor devices and materials
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- Chalcogenide Semiconductor Thin Films
Fritz Haber Institute of the Max Planck Society
2018-2024
Indian Institute of Technology Bhilai
2019-2024
Queen's University Belfast
2012-2019
Raipur Municipal Corporation
2019
Bilkent University
2013-2018
Ankara (Czechia)
2014-2018
National Nanotechnology Research Center
2015
Turkish Aerospace Industries (Turkey)
2014
Indian Institute of Technology Madras
2011
Zinc oxide is synthesised at low temperature (80°C) in nanosheet geometry using a substrate-free, single-step, wet-chemical method and found to act as blue-white fluorophore. Investigation by atomic force microscopy, electron X-ray diffraction confirms zinc material of morphology where the individual nanosheets are polycrystalline nature with crystalline structure being wurtzite character. Raman spectroscopy indicates presence various defects, while photoluminescence measurements show...
Comparison of the relative defect densities (Zn i s and V O s) their photocatalytic efficiency.
Hydrogen is an attractive alternative to fossil fuels in terms of environmental and other advantages. Of the various production methods for H2, photocatalysis requires further development so that it can be applied economically on industrial scale. One- two-dimensional nanostructures both pristine modified forms have shown great potential as catalysts generation H2. We review here recent developments these nanostructure their efficiency H2 under UV/visible/simulated solar light. Despite much...
Heterojunctions are a well-studied material combination in photocatalysis studies, the majority of which aim to improve efficacy catalysts. Developing novel catalysts begs question photo-generated charge carrier is more efficient process catalysis and associated mechanism. To address this issue we have fabricated core–shell heterojunction (CSHJ) nanofibers from ZnO TiO2 two combinations where only 'shell' part exposed environment participate photocatalysis. Core shell structures were via...
Conductive polyanilines are synthesized by doping with inorganic and organic acids, namely Hydrochloric acid (HCl) ±10-camphor sulfonic (CSA). The direct current (DC) conductivities (σDC) found to be about 9.5 ′ 10-8, 1.8, 95.8 S/cm for PANI base, PANI(HCl) PANI(CSA), respectively. σDC is measured down a temperature of ~100 K the apparent change in activation energies 98.16, 74.40, 57.24 meV HCl, CSA dopings less dependent near room temperature, further decrease strongly dependent. Upon...
Photoresponse of n-type indium-doped ZnO and a p-type polymer (PEDOT:PSS) heterojunction devices are studied, juxtaposed with the photoluminescence In-ZnO samples. In addition to expected photoresponse in ultraviolet, heterojunctions exhibit significant visible (532 nm). However, neither doped nor PEDOT:PSS individually show any light. The sub-bandgap originates from photon mediated e-h generation between valence band localized states lying within gap. Though increased doping has limited...
We report on the suitability of water-soluble non-polymeric electrospun cyclodextrin (CD) nanofiber templates by using atomic layer deposition (ALD) to yield metal oxide tubes.
Due to its wide band gap and high carrier mobility, ZnO is, among other transparent conductive oxides, an attractive material for light-harvesting optoelectronic applications. Its functional efficiency, however, is strongly affected by defect-related in-gap states that open up extrinsic decay channels modify relaxation timescales. As a consequence, almost every sample behaves differently, leading irreproducible or even contradicting observations. Here, complementary set of time-resolved...
We report on phase sensitive surface states of CdS quantum dots (QDs), where it is noticed that a simple change from dispersion to solid has shown significant influence the emission spectrum. As solvent evaporates dispersion, apparently yellow transforms into white light emitter because conformal changes in polymer surrounds QDs. In turn, these catalyze three specific wavelengths blue region spectrum, shifting defects closer conduction band CdS. solid, flexible and dangling chains are...
Is fluorescence from graphene oxide because of O2p orbitals or sp<sup>2</sup>localization?
Luminescence from complex systems and crucial factors to consider.
Flexible polymer–GaN nanofibers were fabricated at a temperature much lower than that needed for the preparation of GaN ceramic nanofibers.
We report on a non-universal behavior of leaky surface plasmon waves asymmetric (Si/Au/analyte different height) 1D grating through numerical modelling. The occurrence the wave was maximized (suppressing Fabry–Perot cavity mode), which can be identified in reflection spectrum characteristic minimum. Beyond specific analyte height (h), new sets emerge, each bearing unique Furthermore, all these minima depicted red-shift before saturating at higher h values. This saturation is found to despite...
Abstract Organic/inorganic hybrid systems offer great potential for novel solar cell design combining the tunability of organic chromophore absorption properties with high charge carrier mobilities inorganic semiconductors. However, often such material combinations do not show expected performance: while ZnO, example, basically exhibits all necessary a successful application in light‐harvesting, it was clearly outpaced by TiO 2 terms separation efficiency. The origin this deficiency has long...
In this report, we study the evolution of valence band (VB) structure during a controlled amorphous to tetragonal transformation ZrO2 core–shell nanostructures fabricated from electrospun nanofiber template (at 130, 200, and 250 °C). Shell-ZrO2 was formed with atomic layer deposition. X-ray diffraction transmission electron microscopy are employed unveil crystalline ZrO2. O 1s core-level spectra indicated chemisorbed oxygen (OCh) almost invariant fraction for three samples. Zr 3s level...
The surface areas of electrospun fibers/rice grain-shaped nanostructures TiO2–SiO2 composites were further enhanced after transforming them into thorn or sponge shaped titanates via selective leaching SiO2, which was reported by our group previously [RSC Adv., 2012, 2, 992]. In this study, we report on their application in photocatalytic activity (PCA) when juxtaposed with photoluminescence (PL). Two defect related bands are observed PL and origin is discussed relation to calcination,...
Graphene oxide (GO) was prepared by a solvothermal synthesis method using sodium and ethanol. A sequence of pyrolysis, washing purification steps developed for the total removal all by-products. The first pyrolysis step is essential to obtain graphitic forms carbon while second further improved graphenic structures obtained via reduction OH/COOH C-O groups attendant increase in C[double bond, length as m-dash]C bonding (sp2 hybridization). Two processes were employed remove carbonate...