A Novel Ultra-Sensitive Nitrogen Dioxide Sensor Based on Germanium Monosulfide Monolayer

作者：Wang, Shao-Gang; Tan, Chun-Jian; Yang, Qun; Xu, Yi-Xin; Li, Shao-Lin; Chen, Xian-Ping^*

来源：IEEE Electron Device Letters, 2017, 38(11): 1590-1593.

DOI：10.1109/LED.2017.2755060

• NO2 Sensor
• GeS monolayer
• First principles
• Molecular dynamics

Nitrogen dioxide (NO2) is a representative toxic gas that plays a key role in variety of fields. Due to its extensive application, the demands for reliable sensors to detect NO2 are extremely urgent. Here, we report the adsorption of N-2, CO2, O-2, and NO2 molecules on the GeS monolayer from atomic scale to device scale by first principles and molecular dynamics method. The results indicate that the GeS monolayer is sensitive to NO2 molecules with moderate adsorption energy and pronounced charge transfer. Remarkably, the sorption quantity of the GeS monolayer for NO2 is 708.707mg/g under the 101.33 kPa, which ismuch higher than other molecules. Additionally, the I-V characteristic reveals that when the NO2 molecule is adsorbed, the resistance of the GeS monolayer is nontrivially and distinctly changed. The extraordinarysensitivityand selectivity of the GeS monolayer for NO2 molecules suggests the GeS monolayer is a potential sensing material for NO2 gas.

• 出版日期2017-11
• 单位重庆大学; 桂林电子科技大学