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Vallabh Vidyanagar, India

Vaishnav V.S.,Sardar Patel University | Patel S.G.,Patel University | Panchal J.N.,Sardar Patel University
Advanced Materials Research

Volatile Organic Compounds (VOCs) are highly reactive, often mixed with interfering gases and more importantly, their vapours in the gaseous form respond to the gas sensor devices. Oxide semiconductor based thin film gas sensors play vital role in detecting, monitoring and controlling the presence of hazardous and harmful gases in the environment at very low concentration and hence are tested for the detection of harmful or industrially important VOCs. The demand of sensitive as well stable gas/vapour sensors for direct sensing application has increased the importance of In2O3:SnO2 based semiconductor materials. The paper presents the fabrication aspects of thin film gas sensors based on x1In2O3:x2SnO2 compound and also their application for the detection of some important volatile organic compounds. Thin films of x1In2O3:x2SnO2 were deposited using Thermal Evaporation technique and under the optimized fabrication conditions, the vapour sensors were prepared and mounted on the proper contact jig. Their response to the presence of Volatile Organic Compounds like CCl4 was examined. The stability, the sensitivity and the response time of the sensors were studied for the different concentrations of test vapours. © (2013) Trans Tech Publications, Switzerland. Source

Dev D.,National Fertilizer Ltd | Vivek,Sardar Vallabhbhai Patel University of Agriculture and Technology | Singh S.P.,Krishi Vigyan Kendra | Kumar R.,Patel University
Indian Journal of Agronomy

A field experiment was conducted at Meerut during rabi season 2005-2006 and 2006-2007, in a spilt plot design with four replications to find out the effect of weed management and tillage methods on wheat [Triticum aestivum (L.) emend. Fiori & Paol]. The tillage methods as main-plots treatment comprised of zero tillage, reduced tillage and conventional tillage, whereas weed control practices as sub-plot comprised of five treatments viz. sulfosulforon 25 g/ha, isoproturon 750 g + 2,4-D 250 g/ha, metribuzin 250 g/ha applied at 30 days after sowing, weed free and weedy cheek. The highest yield attributes and yield were noticed under conventional tillage followed by zero tillage. Minimum weed density and dry matter accumulation was found under zero tillage. Zero tillage was most economical. Among the methods of weed control, sulfosulfuron 25 g/ha gave excellent control of weeds and increased the yield attributes and yield, gross returns, net returns and B: C ratio. Thus zero tillage in combination with application of sulfosulfuron 25g/ha was found effective to manage weeds and increase wheat grain yield. Source

Patel K.K.,Smt S M Panchal Science College | Patel M.,Patel University | Patel K.D.,Patel University | Solanki G.K.,Patel University | And 2 more authors.
Journal of Nano- and Electronic Physics

Ag/p-Sn 0.2Se 0.8 Schottky barrier diodes have been fabricated and characterized by the current-voltage (I-V) technique as a function of temperature in the range of 303 K to 403 K. The forward bias characteristics have been analyzed on the basis of thermionic emission (TE) theory and the characteristic parameters of Schottky barrier diode such as barrier height, ideality factor and series resistance have been determined. The conventional Richardson plot was drawn and the value of Richardson constant was determined using the intersection of Ln(I 0/T 2) vs 1000/T. It is found to be around 15 Acm -2K -2 which is closer to the reported value for SnSe. © 2011 SumDU. Source

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