ES1.4 - Recovery of Reacted MoS2-based Gas Sensor Using UVLED Illumination
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Emerging Systems 1 - Devices
- Author(s)
- Y. Kang, K. Hwang, E. Jo, J. Kim - School of Mechanical Engineering, Yonsei University, Seodaemun-gu, Seoul (South Korea)
- Pages
- 294 - 295
- DOI
- 10.5162/IMCS2018/ES1.4
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
This paper reports a unique method to recover MoS2-based gas sensor to its initial unreacted resistance value using UV-LED illumination after the exposure to NO2 of 3~10 ppm. The recovery mechanism involving photo-generated electron-hole pairs in MoS2 was proposed and experimentally verified, while the identical sensor without UV could not recover the original resistance. The recovery of resistance under UV-LED illumination after the exposure to different concentrations of NO2 was also demonstrated. Our approach to recover the reacted MoS2 using UV-LED is highly advantageous for the MoS2-based room temperature gas sensor to be reusable unlike many existing works on 2D nanomaterials-based room temperature gas sensors that may not recover the initial state after the exposure to target gas.