Sensors & Transducers Journal

    (ISSN 1726- 5479)

Vol. 82, Issue 8, August 2007, pp. 1443-1449

An Optoelectronic Sensor Configuration Using ZnO Thick Film for Detection of Methanol

Shobhna DIXIT, K. P. MISRA, Atul SRIVASTAVA,

Anchal SRIVASTAVA and R. K. SHUKLA

Department of Physics, University of Lucknow,

Lucknow-226007, India

Tel.: 0091-522-2740449

E-mail: rajeshkumarshukla_100@yahoo.co.in

Received: 16 July 2007   /Accepted: 20 August 2007   /Published: 27 August 2007

Abstract: In the present paper sensitivity of a nanocrystalline ZnO thick film to methanol vapors is reported. The sensing mechanism is the modulation in the intensity of light reflected from glass film interface. Modulation occurs due to the change in refractive index of ZnO film upon adsorption of vapor molecules. The film has been characterized by XRD, SEM, and optical transmission studies. XRD pattern reveals polycrystalline structure of the film with grain size 33.5 nm.

Keywords: Nanocrystalline, Sensitivity, Physisorption, Chemisorption

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