Application of nanosize polycrystalline SnO₂-WO₃ solid material as CO₂ gas sensor

S. B. Dhannasare^a, S. S. Yawale^b, S.B. Unhale^c, and S.P. Yawale^b

^a Department of Physics, R.L.T College of Science, Akola, India.

^b Department of Physics, Government Vidarbha Institute of Science & Humanities, Amravati-444 604, India.

^c Department of Physics, Arts, Commerce and Science College, Balapur, Akola.

Recibido el 25 de julio de 2012
Aceptado el 17 de agosto de 2012

Abstract

Among binary metal oxide sensors, tin oxide based sensors have received more attention, due to its high reactivity to many gases. The nanosize SnO₂-WO₃ polycrystalline solid material of different mol% was prepared to form thin films by screen printing method. The sensitivity of the films is measured for different concentration of CO₂ gas at room temperature (303K). The variation of sensitivity with CO₂ gas concentration is found to be linear. The sensor 40SnO₂-60WO₃ shows maximum sensitivity in presence of CO₂ gas. The static and dynamic response of the sensors was studied. The reproducibility and stability for all sensors was good. The average crystallite size was calculated from XRD spectra and found to be of the order of 17.11 to 17.17 nm except pure WO₃ film has 22.91 nm.

Keywords: Tungsten oxide; screen-printing technique; carbon dioxide gas; SnO₂-WO₃; sensitivity.

PACS: 82.47.Rs; 07.07.Df

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