P1AP.6 - Suppression of Drift in FET-type Gas Sensor Having WS2 Nanoparticles Using Pulse Measurement
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Applications of Chemical Sensors
- Y. Jeong, J. Shin, Y. Hong, M. Wu, S. Hong, D. Jang, J. Lee, K. Kwon, S. Choi, H. Jang - Department of Electrical Eng., Seoul National University, Seoul (South Korea)
- 446 - 447
In this paper, sensing characteristics of the FET-type gas sensor having WS2 nanoparticles as a sensing layer deposited using ink-jet printer are analyzed with various measurement conditions. In case of using DC measurement method, the transfer curve has a large hysteresis gap due to charge trapping in the sensing layer. For this reason, we adopt a pulse measurement. Transient response of the FET-type gas sensor is measured with NO2 concentrations using DC and pulse measurement methods. Through adopting pulse measurement, drift characteristics of the gas sensor are suppressed and recovery characteristics are improved. As NO2 concentration increases, response rate of the gas sensor increases. As a result, the gas sensing characteristics of the FET-type sensor having WS2 sensing layer are improved effectively by using pulse measurement method.