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Prithivikumaran N.,Nanoscience Research Laboratory
Journal of Chemical and Pharmaceutical Sciences | Year: 2016

Transparent conducting Cadmium oxide (CdO) semiconducting thin films were deposited by sol ' gel spin coating technique on glass substrates. The structural and electrical properties of the deposited films have been studied with a view to investigate the influence of the annealing time on the different physical properties of the films. The structural studies show that the films are polycrystalline in nature with preferred orientation along the (111) plane. The structural parameters such as crystallite size and strain are obtained from the full width at half maximum (FWHM) values of the diffraction peaks. It has been found that the annealing time has a significant influence on the structural properties of the CdO films. The resistivity of the material decreases and reaches a minimum value at 60 minute annealing time, and then increases for further increase in annealing time. A Polycrystalline CdO film with high conductivity was obtained at an annealing time of 60 minutes. Source

Rathinamala I.,Vvvanniaperumal College For Women | Pandiarajan J.,Nanoscience Research Laboratory | Jeyakumaran N.,Nanoscience Research Laboratory | Prithivikumaran N.,Nanoscience Research Laboratory
International Journal of ChemTech Research | Year: 2014

Nanocrystalline Cadmium Sulphide (CdS) thin films were fabricated by employing an in expensive, simplified sol- gel spin coating technique on microscopic glass substrates. The effect of annealing time on surface morphological, structural and optical properties of the films was studied. SEM studies reveal that the grains are spherically shaped and distributed uniformly over the entire surface of the substrate. The crystallite size obtained through the XRD analysis was found to increase with increase in annealing time, varying from 6.1 nm to 9.3 nm. The films show a predominant hexagonal crystal phase with (0 0 2) orientation plane. The UVVisible spectral analysis showed that the band gap value decreased with increase in annealing time. These surface morphological, structural and optical study results suggest that the nanocrystalline CdS thin films could be a potential candidate for designing optoelectronic devices. Source

Bodo B.,Nanoscience Research Laboratory | Kalita P.K.,Nanoscience Research Laboratory
AIP Conference Proceedings | Year: 2010

ZnS thin films are synthesized through chemical bath deposition (CBD) technique from aqueous solution of ZnSO4 and thiourea mixing in equal volume and equimolar ratio. A 1% CuSO4 solution is mixed with the ZnSO4 solution for doping before the final chemical reaction. SEM image shows the formation of mainly nanosheets, teeth and comb like structures. Absorption studies show red shift of enhanced band gap on Cu doping. Photoluminescence of ZnS:Cu reveals the enhancement of blue luminescence at 468nm and low intensity green emission at 493nm which is attributed to more Cu2+ lying in the interstices. XRD shows that the prepared ZnS nanophosphors possess cubic zinc blende structures. © 2010 American Institute of Physics. Source

Devadathan D.,Nanoscience Research Laboratory | Raveendran R.,Nanoscience Research Laboratory
IOP Conference Series: Materials Science and Engineering | Year: 2015

In this study single salts of nickel oxide, cobalt oxide, ferric oxide and the nanocomposite of nickel-cobalt-ferric oxide was prepared by the well-known co-precipitation method. The samples were annealed at different temperatures and were characterized using SEM, EDAX, TGA, FTIR, XRD, UV and Photo luminescence (PL). UV analysis showed that the nanocomposite can be suitably tuned to a wide band gap material. The Photo Luminescence analysis showed that the nanocomposite can be used as light emitters in visible region. © Published under licence by IOP Publishing Ltd. Source

Sengodan R.,Kumaraguru College of Technology | Chandar Shekar B.,Nanoscience Research Laboratory | Sathish S.,Nanoscience Research Laboratory
Indian Journal of Pure and Applied Physics | Year: 2014

Barium titanate powders were synthesized by the wet chemical method using the starting materials barium chloride (BaCl2), titanium dioxide (TiO2) and oxalic acid with different calcinations temperature. The XRD pattern of BaTiO3 calcined at 500 °C showed cubic phase whereas BaTiO3 samples calcined at 700 °C and above showed tetragonal phase. The crystallite size, strain and dislocation density were calculated from the XRD spectrum. It was found that crystallite size increases with increase of calcination temperature. EDS spectrum was used to identify the composition of the material. Absorption co-efficient (α), extinction co-efficient (K) and optical band gap were estimated from the optical reflectance spectrum. The band gap of the powder was found to be decreasing with the increase of calcination temperature. Nanoparticles of both spherical and rod like in shape were clearly observed in the SEM. Source

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