Browsing by Author "Vempati S."
Now showing items 1-15 of 15
-
Amorphous to tetragonal zirconia anostructures and evolution of valence and core regions
(American Chemical Society, 2015)In this report, we study the evolution of valence band (VB) structure during a controlled amorphous to tetragonal transformation of ZrO2 core-shell nanostructures fabricated from electrospun nanofiber template (at 130, ... -
Controlling the photoconductivity: graphene oxide and polyaniline self assembled intercalation
(American Institute of Physics Inc., 2015)We report on controlling the optoelectronic properties of self-assembled intercalating compound of graphene oxide (GO) and HCl doped polyaniline (PANI). Optical emission and X-ray diffraction studies revealed a secondary ... -
Enhanced photocatalytic activity of homoassembled ZnO nanostructures on electrospun polymeric nanofibers: a combination of atomic layer deposition and hydrothermal growth
(Elsevier, 2014)We report on the synthesis and photocatalytic activity (PCA) of electrospun poly(acrylonitrile) (PAN) nanofibrous mat decorated with nanoneedles of zinc oxide (ZnO). Apart from a detailed morphological and structural ... -
Excitation dependent recombination studies on SnO2/TiO2 electrospun nanofibers
(Royal Society of Chemistry, 2015)Poly(vinyl acetate) (PVAc)/TiO2 nanofibers, PVAc/SnO2 nanoribbons and PVAc/SnO2-TiO2 nanoribbons were produced via electrospinning. TiO2 nanofibers and SnO2 nanoribbons were obtained by removal of the polymeric matrix ... -
Fabrication of flexible polymer–GaN core–shell nanofibers by the combination of electrospinning and hollow cathode plasma-assisted atomic layer deposition
(Royal Society of Chemistry, 2015)Here we demonstrate the combination of electrospinning and hollow cathode plasma-assisted atomic layer deposition (HCPA-ALD) processes by fabricating flexible polymer-GaN organic-inorganic core-shell nanofibers at a ... -
Non-universal behavior of leaky surface waves in a one dimensional asymmetric plasmonic grating
(American Institute of Physics Inc., 2015)We report on a non-universal behavior of leaky surface plasmon waves on asymmetric (Si/Au/analyte of different height) 1D grating through numerical modelling. The occurrence of the leaky surface wave was maximized (suppressing ... -
Optoelectronic properties of layered titanate nanostructure and polyaniline impregnated devices
(Wiley - V C H Verlag GmbH & Co. KGaA, 2016)Integrated structure of titanate nanotubes and nanosheets is investigated for their optical, electronic and optoelectronic properties when combined with HCl doped polyaniline (PANI). HR-TEM, SEM and XRD were employed for ... -
Reduced recombination and enhanced UV-assisted photocatalysis by highly anisotropic titanates from electrospun TiO2-SiO2 nanostructures
(Royal Society of Chemistry, 2014)The surface areas of electrospun fibers/rice grain-shaped nanostructures of TiO2-SiO2 composites were further enhanced after transforming them into thorn or sponge shaped titanates via selective leaching of SiO2, which was ... -
Review of one-dimensional and two-dimensional nanostructured materials for hydrogen generation
(Royal Society of Chemistry, 2015)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 ... -
Role of zinc interstitials and oxygen vacancies of ZnO in photocatalysis: a bottom-up approach to control the defect density
(Royal Society of Chemistry, 2014-06-09)Oxygen vacancies (VOs) in ZnO are well-known to enhance photocatalytic activity (PCA) despite various other intrinsic crystal defects. In this study, we aim to elucidate the effect of zinc interstitials (Zn i) and VOs on ... -
Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition
(Royal Society of Chemistry, 2014-02-06)Heterojunctions are a well-studied material combination in photocatalysis studies, the majority of which aim to improve the efficacy of the catalysts. Developing novel catalysts begs the question of which photo-generated ... -
Sensitive surface states and their passivation mechanism in CdS quantum dots
(American Chemical Society, 2013)We report on phase sensitive surface states of CdS quantum dots (QDs), where it is noticed that a simple phase change from dispersion to solid has shown significant influence on the emission spectrum. As the solvent ... -
Surface ionic states and structure of titanate nanotubes
(Royal Society of Chemistry, 2015)Here we present an investigation on Zn-Ti-O ternary (zinc titanate) nanostructures which were prepared by a combination of electrospinning and atomic layer deposition. Depending on the ZnO and TiO2 molar ratio, two titanates ... -
Transformation of polymer-ZnO core-shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysis
(Elsevier, 2015)Photocatalytic activity (PCA) on semiconductors is known to be majorly influenced by specific surface area and intrinsic lattice defects of the catalyst. In this report, we tested the efficiencies of 1D ZnO catalysts of ... -
Water-soluble non-polymeric electrospun cyclodextrin nanofiber template for the synthesis of metal oxide tubes by atomic layer deposition
(Royal Society of Chemistry, 2014)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. To demonstrate this, water-soluble electrospun ...
