title: A MEMS-based Benzene Gas Sensor with a Self-heating WO(3) Sensing Layer.
abstract: In the study, a MEMS-based benzene gas sensor is presented, consisting of a quartz substrate, a thin-film WO(3) sensing layer, an integrated Pt micro-heater, and Pt interdigitated electrodes (IDEs). When benzene is present in the atmosphere, oxidation occurs on the heated WO(3) sensing layer. This causes a change in the electrical conductivity of the WO(3) film, and hence changes the resistance between the IDEs. The benzene concentration is then computed from the change in the measured resistance. A specific orientation of the WO(3) layer is obtained by optimizing the sputtering process parameters. It is found that the sensitivity of the gas sensor is optimized at a working temperature of 300 °C. At the optimal working temperature, the experimental results show that the sensor has a high degree of sensitivity (1.0 KΩ ppm(-1)), a low detection limit (0.2 ppm) and a rapid response time (35 s).
authors.affiliation: Department of Energy and Refrigerating Air-conditioning Engineering, National Taipei University of Technology, Taiwan, Taiwan 106; E-Mails:  mtke@ntut.edu.tw  (M.-T.K.);  me586032037@gmail.com  (M.-T.L.).
authors.forename: Ming-Tsun
authors.initials: MT
authors.lastname: Ke
authors.forename: Mu-Tsun
authors.initials: MT
authors.lastname: Lee
authors.forename: Chia-Yen
authors.initials: CY
authors.lastname: Lee
authors.forename: Lung-Ming
authors.initials: LM
authors.lastname: Fu