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Sensors 2014, 14(8), 13613-13627; doi:10.3390/s140813613

A Selective Ultrahigh Responding High Temperature Ethanol Sensor Using TiO2 Nanoparticles

1
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210, USA
*
Author to whom correspondence should be addressed.
Received: 9 June 2014 / Revised: 17 July 2014 / Accepted: 17 July 2014 / Published: 28 July 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

In this research work, the sensitivity of TiO2 nanoparticles towards C2H5OH, H2 and CH4 gases was investigated. The morphology and phase content of the particles was preserved during sensing tests by prior heat treatment of the samples at temperatures as high as 750 °C and 1000 °C. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis were employed to characterize the size, morphology and phase content of the particles. For sensor fabrication, a film of TiO2 was printed on a Au interdigitated alumina substrate. The sensing temperature was varied from 450 °C to 650 °C with varying concentrations of target gases. Results show that the sensor has ultrahigh response towards ethanol (C2H5OH) compared to hydrogen (H2) and methane (CH4). The optimum sensing temperature was found to be 600 °C. The response and recovery times of the sensor are 3 min and 15 min, respectively, for 20 ppm C2H5OH at the optimum operating temperature of 600 °C. It is proposed that the catalytic action of TiO2 with C2H5OH is the reason for the ultrahigh response of the sensor. View Full-Text
Keywords: sensor; TiO2 nanoparticles; ethanol sensing; catalytic activity sensor; TiO2 nanoparticles; ethanol sensing; catalytic activity
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Arafat, M.M.; Haseeb, A.S.M.A.; Akbar, S.A. A Selective Ultrahigh Responding High Temperature Ethanol Sensor Using TiO2 Nanoparticles. Sensors 2014, 14, 13613-13627.

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