A Selective Ultrahigh Responding High Temperature Ethanol Sensor Using TiO2 Nanoparticles

Sensors

M. M. Arafat¹  A. S. M. A. Haseeb¹ 

[1] Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mail:

关键词: sensor;    TiO₂ nanoparticles;    ethanol sensing;    catalytic activity;   

DOI  :  10.3390/s140813613

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.