Effect of tin oxide concentration in ZnO/SnO₂ nanostuctured composite thin films for xylene detection

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P Nagaraju, Y Vijayakumar and M V Ramana Reddy

Nanosensor Research Laboratory- CMR Technical Campus, India
Osmania University, India

: J Electr Eng Electron Technol

Abstract

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ZnO/SnO2 nanocomposite thin films were synthesised by spray pyrolysis technique with optimised deposition parameters by varying the concentration of tin oxide. XRD results have shown that ZnO/SnO2 nanocomposite thin films are polycrystalline nature with wurtzite type structure with hexagonal phase of ZnO and tetragonal phase of rutile SnO2. The morphological studies have been investigated with field emission electron microscopy and transmission electron microscopy (TEM). Microstructures of the deposited thin films have been confirmed by Raman spectroscopy. Optical characterizations of the prepared samples were investigated using UV-Vis spectrophotometer. X-ray photoelectron spectroscopy (XPS) analysis has been carried out to confirming the oxidation states of elements existing on the surface of the composites thin film. The gas sensing properties of composite thin films towards toluene gas have been carriedout at room temperature. The sensing mechanism of xylene gas has been reported and the respnonse and recovery times were determined from the transient response curve.

Biography

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E-mail: nagarajuphysics@gmail.com