WO₃ nanomaterials synthesized via a sol-gel method and calcination for use as a CO gas sensor

Abstract

Carbon monoxide is a poisonous and hazardous gas and sensitive sensor devices are needed to prevent humans from being poisoned by this gas. A CO gas sensor has been prepared from WO₃ synthesized by a sol-gel method. The sensor chip was prepared by a spin-coating technique which deposited a thin film of WO₃ on an alumina substrate. The chip samples were then calcined at 300, 400, 500 or 600 °C for 1 h. The sensitivities of the different sensor chips for CO gas were determined by comparing the changes in electrical resistance in the absence and presence of 50 ppm of CO gas at 200 °C. The WO₃ calcined at 500 °C had the highest sensitivity. The sensitivity of this sensor was also measured at CO concentrations of 100 ppm and 200 ppm and at operating temperatures of 30 and 100 °C. Thermogravimetric analysis of the WO₃ calcined at 500 °C indicated that this sample had the highest gas adsorption capacity. This preliminary research has shown that WO₃ can serve as a CO gas sensor and that is should be further explored and developed.

Key words： WO₃ nanomaterial; sol-gel; calcinations; CO gas sensor; sensitivity

Acknowledgements

The authors gratefully acknowledge the financial support and facilities provided by the Ministry of Research and Technology Republic of Indonesia through Applied Research Incentive 2012 No 0161.12/IT2.7/PM/2012 and Institut Teknologi Sepuluh Nopember (ITS)-Surabaya Indonesia through International Collaboration Research Grant 2011 No 0750.042/I2.7/PM/2011.

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