Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 160-173

Gas Sensing Performance of Pure and Modified BST Thick Film Resistor

^*1G. H. Jain, ²V. B. Gaikwad, ¹D. D. Kajale, ²R. M. Chaudhari,
²R. L. Patil, ³N. K. Pawar, ¹M. K. Deore, ²S. D. Shinde and ⁴L. A. Patil

¹Department of Physics, Arts, Commerce and Science College,
Nandgaon, India 423 106,

²Department of Chemistry, K. T. H. M. College,
Nashik, India 422 002,

³Department of Physics, K.A.A.N.S. Arts, Commerce and Science College, Satana, India,

 ⁴Material Science Laboratory, Pratap College,
Amalner, India 425 401

*E-mail: gotanjain@rediffmail.com

 Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008

Abstract: Barium Strontium Titanate (BST-(Ba_0.87Sr_0.13)TiO₃) ceramic powder was prepared by mechanochemical process. The thick films of different thicknesses of BST were prepared by screen-printing technique and gas-sensing performance of these films was tested for various gases. The films showed highest response and selectivity to ammonia gas. The pure BST film was surface modified by surfactant CrO₃ by using dipping technique. The surface modified film suppresses the response to ammonia and enhances to H₂S gas. The surface modification of films changes the adsorption-desorption relationship with the target gas and shifts its selectivity. The gas response, selectivity, response and recovery time of the pure and modified films were measured and presented.

Keywords: Barium Strontium Titanate, Thick films, Ammonia gas sensor, H₂S gas sensor, Selectivity

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