AUTHOR=Yi Shuangshuang , Chen Cunguang , Yu Meiling , Hao Juanjuan , Wang You 

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

JOURNAL=Frontiers in Chemistry

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2024.1425693

DOI=10.3389/fchem.2024.1425693

ISSN=2296-2646

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