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Vol. 120, Issue 9, September 2010, pp.70-79

 

Bullet

 

Spray Pyrolyzed Polycrystalline Tin Oxide Thin Film as Hydrogen Sensor

 

aGanesh E. Patil, aD. D. Kajale, bD. N. Chavan, cN. K. Pawar, dV. B. Gaikwad, a,*G. H. Jain

aMaterials Research Lab., Arts, Commerce and Science College, Nandgaon -423 106, MS, India
bDepartment of Chemistry, Arts, Commerce and Science College, Lasalgaon-422 306, India

cDepartment of Physics, Arts, Commerce and Science College, Satana-423 105, MS, India

dMaterials Research Lab., K. T. H. M. College, Nashik -422 005, MS, India

*E-mail: gotanjain@rediffmail.com

 

 

Received: 20 July 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

 

Abstract: Polycrystalline tin oxide (SnO2) thin film was prepared by using simple and inexpensive spray pyrolysis technique (SPT). The film was characterized for their phase and morphology by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The crystallite size calculated from the XRD pattern is 84 nm. Conductance responses of the polycrystalline SnO2 were measured towards gases like hydrogen (H2), liquefied petroleum gas (LPG), ethanol vapors (C2H5OH), NH3, CO, CO2, Cl2 and O2. The gas sensing characteristics were obtained by measuring the sensor response as a function of various controlling factors like operating temperature, operating voltages (1 V, 5 V, 10 V 15 V, 20 V and 25 V) and concentration of gases. The sensor response measurement showed that the SnO2 has maximum response to hydrogen. Furthermore; the SnO2 based sensor exhibited fast response and good recovery towards hydrogen at temperature 150 oC. The result of response towards H2 reveals that SnO2 thin film prepared by SPT would be a suitable material for the fabrication of the hydrogen sensor.

 

Keywords: SnO2 thin film, Gas sensor, Operating voltages, Selectivity, Response and recovery time

 

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