摘要
Detection of ppb-level NO_(2) gas under atmosphere is urgent to meet the requirements of the rapidly developing internet of things.Compared with traditional sensing methods,light illumination has been considered as a key approach for excellent gas sensor performance under moderate conditions.Herein,we developed a green-light-assisted gas sensor based on cadmium sulfide nanowires(CdS NWs)that has good NO_(2) sensing capability at ambient temperature.The response values of NO_(2) are 236%and 11%to 10 ppm and 12.5 ppb,respectively.Furthermore,the CdS NWs sensor has a high selectivity for NO_(2) over a variety of interference gases,as well as good stability.The cleaning light activation and the sulfur vacancy-trapped charge behavior of CdS NWs are observed,which suggest a light-assisted sensing mechanism.These results suggest that light-induced charge separation behavior might significantly improve gas-sensing characteristics.
基金
The authors are thankful for the financial support from the National Key Research and Development Program of China(Grant No.2018YFA0208504)
National Natural Science Foundation of China(NSFC 21932006)
the Youth Innovation Promotion Association of CAS(2017049).
