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Vol. 9, Special Issue, December 2010, pp.82-95

 

Bullet

Studies on Gas Sensing Performance of Pure and Surface Chrominated Indium Oxide Thick Film Resistors

 

1D. N. Chavan, 2V. B. Gaikwad, 2S. D. SHINDE, 3D. D. Kajale, 3G. E. Patil, 3*G. H. Jain

1Department of Chemistry, Arts Commerce and Science College, Lasalgaon 422 306, India

2Materials Research Lab., K.T.H.M. College, Nashik 422 005, India

3Materials Research Lab., Arts, Commerce and Science College, Nandgaon 423 106, India

*E-mail: gotanjain@rediffmail.com

 

 

Received: 27 September 2010   /Accepted: 30 November 2010   /Published: 30 December 2010

 

Abstract: The thick films of AR grade In2O3 were prepared by standard screen-printing technique. The gas sensing performance of thick film was tested for various gases. It showed maximum gas response to ethanol vapor at 350 oC for 80 ppm. To improve the gas response and selectivity of the film towards a particular gas, In2O3 thick films were modified by dipping them in an aqueous solution of 0.1 M CrO3 for different intervals of time. The surface chrominated (20 min) In2O3 thick film showed maximum response to H2S gas (40 ppm) than pure In2O3 thick film at 250 oC. Chromium oxide on the surface of the film shifts the gas response from ethanol vapor to H2S gas. A systematic study of sensing performance of the sensor indicates the key role played by chromium oxide on the surface of thick film. The selectivity, gas response and recovery time of the sensor were measured and presented.

 

Keywords: Ethanol vapor sensor, Surface chromination, H2S gas sensor, Gas response, Selectivity

 

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