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Vol. 134, Issue 11, November 2011, pp.163-169




Nanocrystalline Cobalt-doped SnO2 Thin Film: A Sensitive Cigarette Smoke Sensor

1 Patil Shriram B., 2 More Mahendra A., 3 Patil Arun V.

1 Department of Physics, S. S. V. P. S. L. K. Dr. P. R. Ghogrey Science College, Dhule 424002, North Maharashtra University, India

2 Center for Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Pune, Pune 411007, India

3 Department of Electronics Science, L. V. H. College, Panchavati, Nashik-3, Maharashtra, India

Tel.: +91 9423495614

E-mail: sbpatil25@yahoo.com, aruptl@gmail.com



Received: 29 July 2011   /Accepted: 21 November 2011   /Published: 29 November 2011

Handbook of Laboaratory Measurements book


Abstract: This article discusses a sensitive cigarette smoke sensor based on Cobalt doped Tin oxide (Co-SnO2) thin films deposited on glass substrate by a conventional Spray Pyrolysis technique. The Co-SnO2 thin films have been characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDAX). The XRD spectrum shows polycrystalline nature of the film with a mixed phase comprising of SnO2 and Co3O4. The SEM image depicts uniform granular morphology covering total substrate surface. The compositional analysis derived using EDAX confirmed presence of Co in addition to Sn and O in the film. Cigarette smoke sensing characteristics of the Co-SnO2 thin film have been studied under atmospheric condition at different temperatures and smoke concentration levels. The sensing parameters such as sensitivity, response time and recovery time are observed to be temperature dependent, exhibiting better results at 330 oC.


Keywords: Gas sensor, Spray pyrolysis, Cigarette smoke, Tin oxide, Cobalt oxide


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