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Vol. 120, Issue 9, September 2010, pp.38-52

 

Bullet

 

Gas Sensing Properties of Pure and Cr Activated WO3 Thick Film Resistors

 

1V. B. GAIKWAD, 1R. L. PATIL, 2M. K. DEORE, 1R. M. CHAUDHARI, 1P. D. HIRE, 1S. D. SHINDE, 3*G. H. JAIN

1Materials Research Lab, Department of Physics, K.T.H.M. College, Nashik 422002, India

2Dept. of Physics, Arts, Commerce and Science College, Ozar (Mig) 422 206, India

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

E-mail: 1dr.gaikwadvb@rediffmail.com, 1rameshpatil011@gmail.com, 2deoremadhav@rediffmail.com, *gotanjain@rediffmail.com

 

 

Received:8 June 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

 

Abstract: Thick films of WO3 (Tungsten Oxide) were prepared by screen-printing techniques. The surfaces of the films were modified by dipping them into an aqueous solution of Chromium Oxide (CrO3) for different intervals of time, followed by firing at 550 oC for 30 min. The gas sensing performance of the pure and Cr2O3-modified films was tested for various gases at different temperatures. The unmodified films showed response to H2S, ethanol and cigar smoke. However Cr2O3- modified films suppresses gas sensing response to all gases except H2S. The surface modification, using dipping process, altered the adsorbate-adsorbent interactions, which gave the specific selectivity and enhanced sensitivity to H2S gas. The gas response, selectivity, thermal stability and recovery time of the sensor were measured and presented. The role played by surface chromium species to improve gas sensing performance is discussed.

 

Keywords: WO3 thick film, Cr2O3-modified films, H2S gas sensor, thick films, selectivity, response and recovery time.

 

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