Journal
SENSORS
Volume 14, Issue 8, Pages 13613-13627Publisher
MDPI
DOI: 10.3390/s140813613
Keywords
sensor; TiO2 nanoparticles; ethanol sensing; catalytic activity
Funding
- High Impact Research Grant (HIR) from the University of Malaya [UM.C/625/1/HIR/MOHE/ENG/26]
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In this research work, the sensitivity of TiO2 nanoparticles towards C2H5OH, H-2 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 degrees C and 1000 degrees 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 degrees C to 650 degrees C with varying concentrations of target gases. Results show that the sensor has ultrahigh response towards ethanol (C2H5OH) compared to hydrogen (H-2) and methane (CH4). The optimum sensing temperature was found to be 600 degrees 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 degrees C. It is proposed that the catalytic action of TiO2 with C2H5OH is the reason for the ultrahigh response of the sensor.
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