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Vol. 122, Issue 11, November 2010, pp.128-142

 

Bullet

LPG and NH3 Sensing Properties of SnO2 Thick Film Resistors Prepared by Screen Printing Technique

 

A. S. GARDE

Thin and Thick film laboratory, Department of Physics,
M. S. G. College Malegaon Camp. Malegaon,

Dist-Nasik, Pin-423 105, (MS), India

Tel.: +91-(02554) 252077, +91-9028903045, fax: +91-(02554) 251705

E-mail: arungarde@yahoo.co.in

 

 

Received: 2 October 2010   /Accepted: 18 November 2010   /Published: 30 November 2010

 

Abstract: The gas sensing behavior of SnO2 thick film resistors deposited on alumina substrates has been investigated for LPG and NH3 gas. The standard screen printing technology was used to prepare the thick films. The films were fired at optimized temperature of 780 0C for 30 minutes. The material characterization was performed by XRD, SEM, FTIR, UV and EDAX for elemental analysis. IR spectroscopy analysis at 2949.26 cm-1 showed the peak assigned to the –Sn-H vibration due to the effect of hybridization i.e. sp3 and the sharp peak at 3734.31 cm-1 assigned to –Sn-OH stretching vibration due to hydrogen bonding. The variation of D.C electrical resistance of SnO2 film samples was measured in air as well as in LPG and NH3 gas atmosphere as a function of temperature. The SnO2 film samples show negative temperature coefficient of résistance. The SnO2 film samples showed the highest sensitivity to 600 ppm of LPG at 230 0C and NH3 at 370 0C. The effect of microstructure on sensitivity, response time and recovery time of the sensor in the presence of LPG and NH3 gases were studied and discussed.

 

Keywords: SnO2, Thick film, LPG, NH3, Sensitivity, XRD, SEM, FTIR, UV

 

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