Soumya R. Deo

Synthesis and Characterization of Chemically Deposited Nanocrystalline CdSe Thin Film

The synthesis and characterization of nanocrystalline CdSe thin solid films are reported in this article. Chemical bath deposition, a direct low-cost technique that involves a cadmium salt solution, a complexing agent, and a chalcogen (selenium) source, was used to prepare thin films of CdSe at a temperature 70°C (343 K) in a water bath. Commercially available microscope glass slides (7.5 cm × 2.5 cm × 2 mm) were used as substrates to deposit CdSe films. The characteristics of the prepared thin films were investigated in detail by measuring their optical properties, structural morphology and chemical composition. The films were characterized through x-ray diffraction (XRD), which indicates that the film is polycrystalline in nature. Absorption spectra of thin films have been recorded using a spectrophotometer. The spherical shaped clusters and the presence of elemental constituents were characterized using scanning electron microscopy (SEM) and energy-dispersive x-ray (EDX) analysis. The optical properties were revealed by ultraviolet (UV)–visible absorbance spectra and the bandgap energy was estimated.

Metal Chalcogenide Nanocrystalline Solid Thin Films

Over the past decades, chemical bath deposition (CBD) has proven its suitability and has established itself as one of the prominent techniques for depositing different metal chalcogenide semiconductor thin films via ion-by-ion or by adsorption of colloidal particles from the chemical bath on the substrate. It is a simple, cost-effective and convenient method for large-scale deposition and has recently received a surge of interest. This article reviews the research progress in various methods or techniques including CBD for the preparation and study of the properties of metal chalcogenides. Various parameters for efficient preparation and variation in structural, morphological, compositional, optical properties, etc. are also briefly discussed.

Effect of annealing on structural & optical behavior of nanocrystalline Cd0.5Zn0.5S thin films

The synthesis and characterization of nanocrystalline Cd0.5Zn0.5S thin solid films is reported in the present paper. Chemical bath deposition, a direct low cost technique that involves metal ions (Cd2+ and Zn2+) source, a complexing agent and a chalcogen (sulphur) source was used to prepare thin films of Cd0.5Zn0.5S at a temperature of 70°C (343 K), with pH of 11 and deposition time of 2.5 hours. The characteristics of the prepared Cd0.5Zn0.5S thin films were investigated by their structural and optical properties and the effect of annealing on these properties were also studied.

Photocatalytic degradation of an azo dye with ZnO nanoparticles

In the present paper we reported the method to prepare ZnO nanoparticles by alkaline precipitation method for the degradation of an azo dye. We have used ZnO nanoparticles assisted with UV light irradiation to investigate the photocatalytic degradation of azo dyes. The ZnO photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence.