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Vol. 125, Issue 2, February 2011, pp.142-155



Studies on Gas Sensing Performance of Cr-doped Indium Oxide Thick Film Sensors


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

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

2Materials Research Lab., Arts, Commerce and Science College, Nandgaon 423 106, India

3Materials Research Lab., K.T.H.M. College, Nashik 422 005, India.

*E-mail: gotanjain@rediffmail.com



Received: 5 December 2010   /Accepted: 15 February 2011   /Published: 28 February 2011


Abstract: A series of In1-xCrxO3 composites, with x ranging from 0.01 to 0.5wt% were prepared by mechanochemically starting from InCl3 and CrO3. Structural and micro structural characteristics of the sample were investigated by XRD, SEM with EDAX. Thick films of pure Indium Oxide and composites were prepared by standard screen printing technique. The gas sensitivity of these thick films was tested for various gases. The pure Indium Oxide thick film (x=0) shows maximum sensitivity to ethanol vapour (80 ppm) at 350 oC, but composite-A (x=0.01) thick film shows maximum sensitivity to H2S gas (40 ppm) at 250 oC, composite-B (x=0.1) thick film shows higher sensitivity to NH3 gas (80 ppm) at 250 oC and composite-C (x=0.5) thick film shows maximum sensitivity to Cl2 gas (80 ppm) at 350 oC. A systematic study of gas sensing performance of the sensors indicates the key role played by concentration variation of Cr doped species. The sensitivity, selectivity and recovery time of the sensor were measured and presented.


Keywords: Indium oxide, Composite thick films, Gas sensor, Sensitivity, Selectivity


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