2D/2D Bi2Se3/SnSe2 heterostructure with rapid NO2 gas detection

Heterostructure engineering is crucial for enhancing gas sensing performance. However, achieving rapid response for room-temperature NO 2 sensing through rational heterostructure design remains a challenge. In this study, a Bi 2 Se 3 /SnSe 2 2D/2D heterostructure was synthesized by hydrothermal method for the rapid detection of NO 2 at room temperature. By combining Bi 2 Se 3 nanosheets with SnSe 2 nanosheets, the Bi 2 Se 3 /SnSe 2 sensor demonstrated and the lowest detection limit for NO 2 a short response time (15 s) to 10 ppm NO 2 at room temperature, reaches 25 ppb. Furthermore the sensor demonstrates significantly larger response to NO 2 than to other interfering gases, including 10 ppm NO 2 , H 2 S, NH 3 , CH 4 , CO, and SO 2 ,demonstrating its outstanding selectivity. And we discuss the mechanism of related performance enhancement.