Oxygen vacancy engineered tin dioxide/tungsten disulfide heterostructure construction for effective NO sensing. Issue 15 (24th March 2023)

• Record Type: Journal Article
• Authors: Lv, Baofeng; Pei, Yongyong; Wu, Shuo-En; Xu, Tingting; Huang, Xiaowen; Tian, Yongtao; Wang, Xinchang; Zeng, Longhui; Li, Xinjian
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 15(2023)
• Page Start: 5056
• Page End: 5063
• Publication Date: 2023-03-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc05029c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Oxygen vacancy engineered SnO2 /WS2 heterostructures are constructed by an effective hydrothermal process to improve the sensitivity/selectivity and realize low operating temperature. The response ( R g / R a ) of the hybrid to 5 ppm NO was 6.24 at 75 °C. Abstract : High-performance NO gas sensors operating at low temperature are urgently desirable for both civilian and industrial purposes. However, it remains a great challenge to prepare tin dioxide (SnO2 )-based hybrids in a simple and effective way and realize low operating temperature and high sensitivity/selectivity simultaneously. Here, we demonstrate the successful construction of a SnO2 /tungsten disulfide (WS2 ) heterostructure using a simple hydrothermal method. By taking advantage of SnO2 nanocrystals dispersing uniformly on WS2 nanosheets and the increased oxygen vacancies as well as the existence of Sn 2+, the SnO2 /WS2 hybrid heterostructure shows a significant improvement in response and a much better selectivity to NO compared with the SnO2 microspheres. More importantly, the response ( R g / R a ) of the SnO2 /WS2 hybrid to 5 ppm NO is 6.24 at 75 °C, which is 6.10- and 4.21-fold higher than that of the SnO2 microspheres and WS2 nanosheets, respectively. Thus, the hybrid heterostructure displays good performance with better selectivity, shorter response/recovery time and good repeatability, indicating its potential application in monitoring NO gas exhaled by humans.