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Vol. 101, Issue 2, February 2009, pp.60-72





Cobalt Doped SnO2 Thick Film Gas Sensors: Conductance and Gas Response Characteristics for LPG and CNG Gas


1V. Kumar, 1S. K. Srivastava, 2*Kiran Jain

1College of Engineering Technology IFTM, Moradabad, U.P., India

2Electronic Material Division, National Physical Laboratory, New Delhi, India

Tel.: 91-45608279

E-mail: kiran@mail.nplindia.ernet.in



Received: 12 January 2009   /Accepted: 20 February 2009   /Published: 28 February 2009


Abstract: Cobalt doped thick films tin oxide sensors were studied for their LPG and CNG gas sensitivity. SnO2 powder was synthesized by precipitation technique and doped with cobalt sulphate (0 to 10 wt %) by impregnation technique. The sensing characteristics were found to depend on the cobalt concentration and operating temperature. Best performance for LPG and CNG detection was obtained for 3 wt % addition of cobalt sulphate. Cobalt doped SnO2 sensors showed a decrease in the optimum temperature for CNG detection from 450C to 350C. The transient response characteristics were determined at different temperatures and doping concentrations to understand the effect of doping on the rate kinetics. A correlation was established between response time, sensor response and the intergranular potential barriers.


Keywords: Metal oxide, Tin oxide, Gas sensor, LPG sensor, Cobalt-doping, Transient response characteristics


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