Zhang Dongzhi, Pan Wenjing, Zhou Lanjuan, Yu Sujing
College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33392-33403. doi: 10.1021/acsami.1c03884. Epub 2021 Jul 6.
A gold-doped zinc oxide (Au-ZnO)/exfoliated tungsten diselenide (exfoliated WSe) nanocomposite-based gas sensor toward benzene with high sensing properties was demonstrated. Epoxy resin was used as the matrix of the Au-ZnO/exfoliated WSe nanocomposite sensor. The straw-shaped Au-ZnO was synthesized by the hydrothermal method, and WSe nanosheets (NSs) were prepared via hydrothermal and liquid-phase exfoliation methods. The properties of Au-ZnO/exfoliated WSe nanoheterostructures constructed by self-assembly technology have been confirmed via a series of characterization methods. The benzene-sensing performances of sensors were tested at 25 °C. Compared with Au-ZnO, WSe and their composites, the Au-ZnO/exfoliated WSe sensor has a significant performance improvement, including a higher response and linear fit degree, better selectivity and repeatability, and faster detection rate. The significantly enhanced sensing properties of the Au-ZnO/exfoliated WSe sensor can be ascribed to the doping of Au nanoparticles, the increase in the specific surface area and adsorption sites of NSs after exfoliation, and the cooperative interface combination of the ZnO/WSe heterojunction. Furthermore, the sensitivity mechanism of the composite sensor to benzene was explored by density functional theory simulations.
展示了一种基于金掺杂氧化锌（Au-ZnO）/剥离二硒化钨（exfoliated WSe）纳米复合材料的对苯具有高传感性能的气体传感器。环氧树脂用作Au-ZnO/剥离WSe纳米复合传感器的基体。通过水热法合成了稻草状的Au-ZnO，并通过水热法和液相剥离法制备了WSe纳米片（NSs）。通过一系列表征方法证实了通过自组装技术构建的Au-ZnO/剥离WSe纳米异质结构的性能。在25℃下测试了传感器的苯传感性能。与Au-ZnO、WSe及其复合材料相比，Au-ZnO/剥离WSe传感器具有显著的性能提升，包括更高的响应和线性拟合度、更好的选择性和重复性以及更快的检测速率。Au-ZnO/剥离WSe传感器传感性能的显著增强可归因于金纳米颗粒的掺杂、剥离后NSs比表面积和吸附位点的增加以及ZnO/WSe异质结的协同界面结合。此外，通过密度泛函理论模拟探索了复合传感器对苯的敏感机制。
