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Humidity sensing characteristics of hydrotungstite thin films

Kunte, GV and Shivashankar, SA and Umarji, AM (2008) Humidity sensing characteristics of hydrotungstite thin films. In: Bulletin of Materials Science, 31 (6). pp. 835-839.

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Thin films of the hydrated phase of tungsten oxide, hydrotungstite (H2WO4⋅H2O), have been grown on glass substrates using a dip-coating technique. The b-axis oriented films have been characterized by X-ray diffraction and scanning electron microscopy. The electrical conductivity of the films is observed to vary with humidity and selectively show high sensitivity to moisture at room temperature. In order to understand the mechanism of sensing, the films were examined by X-ray diffraction at elevated temperatures and in controlled atmospheres. Based on these observations and on conductivity measurements, a novel sensing mechanism based on protonic conduction within the surface layers adsorbed onto the hydrotungstite film is proposed.

Item Type: Journal Article
Publication: Bulletin of Materials Science
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Tungsten oxide;hydrotungstite;humidity sensor;selectivity; protonic conduction.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 21 Feb 2010 10:07
Last Modified: 19 Sep 2010 05:24
URI: http://eprints.iisc.ac.in/id/eprint/18623

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