Vol. 107, Issue 8, August 2009, pp. 92-98

Optimization of Firing Temperature of PbO-doped SnO₂ Sensor for Detection of Acetone, Methanol, Propanol

J. K. Srivastava, Preeti Pandey, V. N. Mishra and R. Dwivedi

Center for Research in Microelectronics, Department of Electronics Engineering,

Institute of Technology, Banaras Hindu University, Varanasi 221005, India

Fax: 0542-2366758

E-mail: jks_jitendra@rediffmail.com

Received: 30 April 2009   /Accepted:  15 August 2009   /Published: 25 August 2009

Abstract: In the present work, the response of a set of three PbO (1 % wt) doped thick film SnO₂ sensors fired at different firing temperatures (650⁰ C, 750⁰ C, 850⁰ C) have been studied. The selection of appropriate firing temperature is necessary for the sensor fabrication in order to achieve the highest sensitivity for a particular species of gas. To achieve this, thick film PbO-doped sensor were fabricated on a 1˝x1˝ alumina substrate. The sensitivity of these sensors has been studied at different operating temperatures (150⁰ C-350⁰ C) upon exposure to acetone, methanol and propanol. The sensor fired at 850⁰ C besides having good adhesion yields maximum sensitivity at an operating temperature of 250⁰ C for all gases except acetone for which it gives maximum response at 200⁰ C.

Keywords: Thick film sensor, Tin oxide, Firing temperature, Gas sensing mechanism

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