Showing papers by "Maheshwar Sharon published in 2013"
TL;DR: In this paper, thin composite films were grown onto glass micro slides from an aqueous alkaline medium using a chemical bath deposition process and the chemical composition and surface morphology of these films were determined by an Energy Dispersive Spectroscopy (EDS) and the Scanning Electron Microscopy (SEM), respectively.
17 citations
TL;DR: In this article, the photovoltaic output performance of the Cd1−xCoxS based electrochemical cell is much improved after Co-implantation (x = 0.1) in CdS.
11 citations
TL;DR: In this article, chemical deposition of ZnSe thin films highlighting influence of reducing environment on the structural properties and surface morphology is presented, where Hydrazine hydrate was used as a reducing agent to initiate growth process and to reduce selenosulfate to Se2− ions that permits formation of non-stoichiometric Zn-Se film layers.
10 citations
TL;DR: In this paper, the zinc selenide thin films were obtained for the first time on the glass microslides using a liquid phase chemical bath deposition and the deposition conditions, such as bath temperature (70 0C), deposition time (210 mins), reaction pH (10.5± 0.2), and quantity of hydrazine hydrate (reducing agent) and the possible growth mechanism and reaction kinetics have been suggested.
Abstract: Being a promising and potential candidate for optoelectronic device applications, zinc selenide thin films were obtained for the first time on the glass microslides using a liquid phase chemical bath deposition. The deposition conditions, such as bath temperature (70 0C), deposition time (210 mins.), reaction pH (10.5± 0.2) and quantity of hydrazine hydrate (reducing agent) were finalized and the possible growth mechanism and reaction kinetics have been suggested. As the ZnSe films grow well in strong reducing atmosphere, the quantity of hydrazine hydrate was varied from 2 ml to 15 ml and ZnSe samples were obtained. The final product ZnSe thin films are physically hard, tightly adherent, relatively uniform and diffusely reflecting with light brown colored tinge in smoky appearance. An EDS analysis showed that the film stoichiometry depends on quantity of the added reducing agent in the bath. Structural studies were carried out on these films by an X-ray diffraction technique using Cukα radiation. It appeared that the ZnSe films are hexagonal wurtzite in structure with preferred orientation along . The calculated d-values, intensities of reflections and lattice parameters matched with that of the JCPD data. The calculated particle size decreased with quantity of hydrazine hydrate added in the bath (decrease in Zn/Se ratio). The optical absorption measurements in the range of wavelength from 300-1100 nm showed direct type of transitions with an optical gap decreased from 2.71 eV to 2.60 eV for the change of Zn/Se ratio from 0.993 to 0.571. The surface features revealed by SEM showed that the crystallites are nonuniformly distributed and spherical in shape. From micrographs it is seen that crystallite size decreased with increasing amount of hydrazine hydrate. Some overgrowth like structures (of the same size and shapes) has also been observed at high concentration of hydrazine hydrate. DOI: http://dx.doi.org/10.3126/jncs.v30i0.9384 Journal of Nepal Chemical Society Vol. 30, 2012 Page: 130-137 Uploaded date: 12/20/2013
5 citations
13 Jun 2013
TL;DR: In this article, Pumice plate and carbon felt are used as electrodes for the oxidation for hydrogen and reduction of oxygen in 30% KOH solution, respectively, and an over potential of 37mV and 56mV were obtained with carbon felt electrode for hydrogen oxidation process and oxygen reduction process respectively.
Abstract: Pumice plate and carbon felt are tried as electrode for the oxidation for hydrogen and reduction of oxygen in 30% KOH solution. Pumice plate is found to be not suitable for making large area electrode. Carbon felt after depositing conducting carbon by pyrolysis of camphor is found to be hydrophobic. This was used as an electrode for hydrogen oxidation process after depositing platinum (0.2 mg/cm2). This system gives current density of 9.0mA/cm2 and opens circuit potential of 0.423V VsZn/ZnO22−. It is observed that for oxygen reduction process, carbon felt deposited with conducting carbon is sufficient and there is no need to use any electrocatalyst. It is observed that with carbon felt a current density of 89.56mA/cm2 and open circuit potential 1.272 V VsZn/ZnO22− canbe obtained. An over potential of 37mV and 56mV were obtained with carbon felt electrode for hydrogen oxidation process and oxygen reduction process respectively. It is concluded that carbon felt coated with conducting carbon can be used for ...
1 citations