AP1.3 - 2D SnX2 (X=S, Se) Based Heterojunctions for NO2 Sensing at Low Temperatures
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- Applications 1 - Sensing NO2
- X. Li, D. Gu, X. Li, X. Wang, T. He - Dalian University of Technology, School of Microelectronics, Dalian (P.R.China)
- 161 - 162
Two dimensional nanomaterials (2D) SnX2 (X=S, Se) based chemiresistive-type sensors was investigated for detecting NO2 at low temperatures. It was found that SnO2 nanocrystal-dotted SnS2 heterojunctions formed by in-situ thermal oxidation in a controlled environment indicated a good sensitivity and selectivity to NO2 at 80 oC. The lower operating temperature was attributed to enhanced catalytic properties to NO2 by the SnO2 nanocrystals. With the replacement of S by Se in SnX2 compound, the working temperature of SnX2 based NO2 sensor could be further decreased significantly to near room temperature. Theoretical calculation according to Density-Function-Theory (DFT) indicates that SnSe2 has a higher NO2 adsorption ability compared to SnS2.