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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.

AP1.3 - 2D SnX2 (X=S, Se) Based Heterojunctions for NO2 Sensing at Low Temperatures