Topological insulator Bi₂Se₃ for highly sensitive, selective and anti-humidity gas sensors.

ABSTRACT: Chemiresistive gas sensors generally surfer from low selectivity, inferior anti-humidity, low response signal or signal-to-noise ratio, severely limiting the precise detection of chemical agents. Herein, we exploit high-performance gas sensors based on topological insulator Bi₂Se₃ that is distinguished from conventional materials by robust metallic surface states protected by time-reversal symmetry. In the presence of Se vacancies, Bi₂Se₃ nanosheets exhibit excellent gas sensing capability toward NO₂, with a high response of 93% for 50 ppm and an ultralow theoretical limit of detection concentration about 0.06 ppb at room temperature. Remarkably, Bi₂Se₃ demonstrates ultrahigh anti-humidity interference characteris

SUBMITTER: Du B 

PROVIDER: S-EPMC10074142 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature