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

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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