No2 Gas Sensor Based on Urchin-Like Bi2s3/Mos2 Composite At Room Temperature

NO2 is one of the main components in haze, and its real-time monitoring is the basis for solving environmental problems. The application of metal oxide gas sensors is limited in daily life which works at high temperature, while metal sulfide sensors can work at room temperature to solve this problem. The urchin-like Bi2S3/MoS2 was prepared by microwave hydrothermal method. The Bi2S3/MoS2 composites were characterized by XRD, HRSEM, and XPS respectively. The results show that the gas sensing response of Bi2S3/MoS2 is three times that of pure Bi2S3 and has shorter recovery time. A strong adsorbability of MoS2 makes the composites contact with nitrogen dioxide gas easier than that of pure Bi2S3 , thus the gas sensitive response of Bi2S3/MoS2 sensor was improved. The high gas sensitivity makes Bi2S3/MoS2 more valuable for NO2 detection at room temperature