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Vol. 6, Special Issue, August 2009, pp.57-68





Studies on Gas Sensing Performance of Pure and Surface Modified SrTiO3 Thick Film Resistors


 1V. B. Gaikwad, 2D. D. Kajale, 2Y. R. Baste, 1S. D. Shinde, 3P. K. Khanna,
4N. K. Pawar, 5D. N. Chavan, 6M. K. Deore, 6*G. H. Jain

1Material Research Lab., K.T.H.M. College, Nashik 422 005, India

2Dept. of chemistry, Arts, Commerce and Science College, Nandgaon 423 106, India

3Centre for Materials for Electronics Technology(C-MET), Pune 411008, India

4Dept. of physics, K. A. A. N. M. S Arts, Commerce and Science College, Satana 423 105, India

5Dept. of chemistry, Arts, Commerce and Science College, Lasalgaon 422 306, India

6Dept. of Physics, Arts, Commerce and Science College, Nandgaon 423 106, India

*E-mail: gotanjain@rediffmail.com



Received: 10 July 2009   /Accepted: 31 July 2009   /Published: 10 August 2009


Abstract: Strontium Titanate (SrTiO3 (ST)) was prepared mechanochemically from Sr(OH)2 and TiO2. XRD confirms the Perovskite phase of material. Thick films of ST were prepared by screen-printing technique. The gas sensing performances of thick films were tested for various gases. It showed maximum sensitivity to CO gas at 350 oC for 100 ppm gas concentration. To improve the sensitivity and selectivity of the film towards a particular gas, ST thick films were surface modified by dipping them in a solution of nano copper for different intervals of time. These surface modified ST films showed larger sensitivity to H2S gas (100 ppm) at 300 oC than pure ST film. A systematic study, of sensing performance of the sensor, indicates the key role-played by the nano copper species on the surface .The sensitivity, selectivity, response and recovery time of the sensor were measured and presented.


Keywords: Strontium titanate (SrTiO3, ST), Thick films, CO gas sensor, H2S gas sensor, Sensitivity, Selectivity


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