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Journal of Sensors
Volume 2008, Article ID 254283, 5 pages
Research Article

Titanium Dioxide-Based YX Surface Acoustic Wave Hydrogen Gas Sensors

1School of Electrical and Computer Engineering, RMIT University, Melbourne Victoria 3001, Australia
2Department of Mechanical Engineering, University of Padova, via Marzolo 9, 35131 Padova, Italy
3School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia

Received 6 May 2008; Accepted 27 June 2008

Academic Editor: Michele Penza

Copyright © 2008 A. Z. Sadek et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Amorphous titanium dioxide () and gold (Au) doped -based surface acoustic wave (SAW) sensors have been investigated as hydrogen gas detectors. The nanocrystal-doped films were synthesized through a sol-gel route, mixing a Ti-butoxide-based solution with diluted colloidal gold nanoparticles. The films were deposited via spin coating onto YX SAW transducers in a helium atmosphere. The SAW gas sensors were operated at various temperatures between 150 and C. It was found that gold doping on increased the device sensitivity and reduced the optimum operating temperature.