Vol. 125, Issue 2, February 2011, pp.156-167

Preparation and Studies on Gas Sensing Performance of Pure and Modified Sn-TiO₂ Thick Film Resistor

¹P. D. HIRE, ¹V. B. GAIKWAD, ²N. U. PATIL, ¹R. L. PATIL, ¹R. M. CHAUDHRI, ¹ S. D. SHINDE ^*3G. H. JAIN

¹ Material Science Lab. K.T.H.M. College. Nasik - 422 002, India

² Dept of Physics, Arts, Science and Commerce College, Igatpuri, 422 303, India

³ Dept of Physics, Arts, Science and Commerce College, Nandgaon -423 106, India

^*E-mail: gotanjain@rediffmail.com

Received: 11 January 2011   /Accepted: 15 February 2011   /Published: 28 February 2011

Abstract: In this work we report the preparation, microstructure, electric properties and gas sensing performance of Sn-TiO₂ (ST) powder prepared by chemical method. The gas sensing performance of the unmodified and surface modified films was tested for various gases. The unmodified ST films showed temperature programmed sensitivity. Unmodified ST films could select different gases at different operating temperatures for ex. it selects H₂ at 250 °C, H₂S at 300 °C, Cl₂ at 350 °C and LPG at 400 °C. As prepared films were modified by dipping technique by using NiCl₂ ­precursor solution. These surface modified ST films showed response to only H₂ (800 ppm) gas. Surface modification of the ST thick films, altered the adsorbate-adsorbent interactions, which gave the unusual selectivity and sensitivity effect. The characterization of the films was done by XRD, SEM and TGA. The sensitivity, selectivity, of the ST thick films were measured and presented.

Keywords: Sn-TiO₂ (ST) thick films; H₂ gas sensor; Selectivity, Temperature programmed sensitivity

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