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Marikkannu S.,Arumugam Pillai Seethai Ammal College | Kashif M.,University Malaysia Perlis | Sethupathy N.,Arignar Anna Government Arts College | Piraman S.,Alagappa University | And 4 more authors.
Materials Science in Semiconductor Processing | Year: 2014

This study focused on the effect of substrate temperature (350°C, 400°C, and 450°C) on morphological, optical, and electrical properties of indium tin oxide (ITO) films deposited onto porous silicon/sodalime glass substrates through jet nebulizer spray pyrolysis for use in heterojunction solar cells. X-ray diffraction analysis confirmed the formation of pure and single-phase In2O3 for all the deposited films whose crystallinity was enhanced with increasing substrate temperature, as shown by the increasing (222) peak intensity. Morphological observations were conducted using scanning electron microscopy to reveal the formation of continuous dense films composed of nanograins. The UV-vis spectra revealed that the transmittance increased with increasing substrate temperature, reaching a value of over 80% at 450°C. The photoelectric performance of the solar cell was studied using the I-V curve by illuminating the cell at 100 mW/cm2. A high efficiency (η) of 3.325% with Isc and Voc values of 14.8 mA/cm2 and 0.60 V, respectively, was attained by the ITO solar cell annealed at 450°C. © 2014 Elsevier Ltd. All rights reserved. Source

Kannan Y.B.,Arumugam Pillai Seethai Ammal College | Saravanan R.,The Madura College | Srinivasan N.,Thiagarajar College of Engineering | Praveena K.,University of Hyderabad | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

Two different compositions of ferrites namely Ni0.53Cu0.12Zn0.35Fe2O4 and Mg0.2Cu0.3Zn0.5Fe2O4 have been synthesized by co-precipitation method and sintered at 900 °C/5h. The prepared samples are analyzed for their structural, morphology, elemental composition and magnetic properties by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence and vibrating sample magnetometer respectively. Spinel phase, along with the hematite as an additional phase, in both samples is confirmed from the XRD characterizations results. Rietveld refinement method is employed to analyze the structural parameters of the samples. Density and saturation magnetization have found to be increased from that of undoped sample values. Homogeneous distributions of particles and well defined particle sizes are revealed from SEM studies of the samples. Maximum entropy method is employed to compute the numerical value of various sites interactions in ferrites and the findings are compared and analyzed with that of magnetic studies. © 2016 Springer Science+Business Media New York Source

Jeyanthi V.,Sri Kaliswari College | Jeyanthi V.,SRM University | Paul J.A.J.,Arumugam Pillai Seethai Ammal College | Selvi B.K.,V V Vanniaperumal College For Women | Karmegam N.,Salem College
Environmental Processes | Year: 2016

The aim of this study was to investigate the biochemical responses in three earthworm species, Eudrilus eugeniae, Perionyx ceylanensis and Perionyx excavatus induced by exposure to pesticide (carbaryl) and metal (lead) in soil. Earthworms were exposed to increasing concentrations of carbaryl (12, 25 and 50 mg kg −1) and Pb (75, 150 and 300 mg kg −1) in the soil for different periods of time and the biochemical changes were determined. The protein content was slightly increased in E. eugeniae, P. ceylanensis when exposed to the lower concentration of Pb (75 mg kg−1). But decreased protein content was observed in P. excavatus at the higher concentration of carbaryl (50 mg kg−1), and with exposure to 300 mg kg−1 Pb in P. ceylanensis. The changes in the levels of antioxidant enzymes glutathione-S-transferase (GST), glutathione peroxidase (GPx), reduced glutathione (GSH), superoxide dismutase (SOD) and catalase (CAT) were used as functional biomarkers to determine the effect of pesticides and metals on earthworms. Among these, GST exhibited more sensitive response to both carbaryl and Pb as compared to the control. Other antioxidant enzymes showed little variation at the time of exposure. The results of our study suggested that both carbaryl and Pb induced the production of Reactive oxygen species (ROS) by causing oxidative damage to cells. Due to an adaptive response of earthworms in contaminated soils, they could be used as significant biomarkers to asses the toxicity in the environment of the soil ecosystem. This is the first report on the comparative study of antioxidant enzyme activities in three earthworm species under normal and stress induced conditions. © 2016, Springer International Publishing Switzerland. Source

Premarani R.,Arumugam Pillai Seethai Ammal College | Jebaraj Devadasan J.,Popes College | Saravanakumar S.,Sree Sevugan Annamalai College | Chandramohan R.,Sree Sevugan Annamalai College | Mahalingam T.,Ajou University
Journal of Materials Science: Materials in Electronics | Year: 2015

Room-temperature ferromagnetic behavior of undoped cadmium sulphide (CdS) and Ni-doped CdS thinfilms prepared by chemical bath deposition technique is reported. The crystallite sizes of the thinfilms have been characterized by X-ray diffraction pattern. The particle sizes increase from 11 to 40 nm with the increase of Ni content in the CdS thinfilms. scanning electron microscope results indicated that CdS thinfilms is made up of aggregate of spherical-like particles. The composition was estimated by Energy dispersive analysis of X-ray and reported. Spectroscopic studies revealed considerable improvement in transmission and the band gap of the films decreased from 2.62 to 2.28 eV with addition of Ni dopant that is associated with variation in crystallite sizes in the nano regime. Magnetization measurements indicate that the Ni doped CdS thinfilms exhibited ferromagnetism and the saturation magnetization decreases with the increase of crystal sizes in the Ni doped CdS nano thinfilms. This finding in CdS thinfilms should be focus of the future electronic and spintronics devices. © 2014, Springer Science+Business Media New York. Source

Ravikumar M.,Arumugam Pillai Seethai Ammal College | Valanarasu S.,Arul Anandar College | Chandramohan R.,Sree Sevugan Annamalai College | Jacob S.S.K.,Arul Anandar College | Kathalingam A.,Dongguk University
Journal of Electronic Materials | Year: 2015

CdO thin films were deposited on glass and silicon substrates by simple perfume atomizer at 350°C using cadmium acetate and trisodium citrate (TSC). The effect of the TSC concentration on the structural, morphological, optical, and photoconductive properties of the prepared CdO thin films was investigated. X-Ray diffraction (XRD) studies of the deposited films revealed improvement in crystalline nature with increase of TSC concentration. Films prepared without TSC showed porous nature, not fully covering the substrate, whereas films prepared using TSC exhibited full coverage of the substrate with uniform particles. Optical transmittance study of the films showed high transmittance (50% to 60%), and the absorption edge was found to shift towards the red region depending on the TSC concentration. The films exhibited a direct band-to-band transition with bandgap varying between 2.31 eV and 2.12 eV. Photoconductivity studies of the n-CdO/p-Si structure for various TSC concentrations were also carried out. I–V characteristics of this n-CdO/p-Si structure revealed the formation of rectifying junctions, and its photoconductivity was found to increase with the TSC concentration. © 2015, The Minerals, Metals & Materials Society. Source

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