Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Vol. 137, Issue 2, February 2012, pp. 10-21
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Effect of Surface Modification on SrTiO3 Thick films: Room Temperature H2S Gas Sensor
1 D. D. Kajale, 2 V. B. Gaikwad, 2 S. D. Shinde, 3 D. N. Chavan, 1 Ganesh E. Patil, 4 V. P. Patil, 1,* G. H. Jain1 Materials Research Lab., Arts, Commerce and Science College, Nandgaon 423 106, India 2 Materials Research Lab., K. T. H. M. College, Nashik 422 005, India 3 Department of Chemistry, Arts, Commerce and Science College, Lasalgaon 422 306, India 4 Department of Physics, BHAVAN’S College, Mumbai 400 058, India Tel.: +91 9423474476 * Email: gotanjain@rediffmail.com
Received: 9 November 2011 /Accepted: 14 February 2012 /Published: 28 February 2012 |
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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 into the solution of nano copper for different intervals of time. These films were found to be sensitive towards 1 ppm of H2S at Room Temperature. The response was reproducible and the films were stable for operation over three months. The detection mechanism of the sensors was investigated and it was found that the Cu would be transformed upon firing into copper oxide. The p-type CuO grains around n-type ST grains would form n-ST/p-CuO hetero-junction. Upon exposure to H2S gas, the barrier height of n-ST/p-CuO hetero-junctions decreases markedly due to the chemical transformation of p-CuO into well conducting CuS leading to drastic change in resistance. The efforts have, therefore, been made to develop the Room Temperature H2S gas sensor based on strontium titanate surface modified with nano Cu. The gas response, selectivity, stability of sensor, response and recovery time of the sensor in the presence of H2S gas were studied.
Keywords: MSrTiO3 thick films, Surface modification, Room temperature H2S gas sensor, Selectivity
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