Hierarchical Nanoheterostructure of Tungsten Disulfide Nanoflowers Doped with Zinc Oxide Hollow Spheres: Benzene Gas Sensing Properties and First-Principles Study

作者：Dongzhi Zhang, Junfeng Wu, Peng Li, Yuhua Cao, Zhimin Yang · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b07021 · 被引用次数：127 · 研究领域：Gas Sensing Nanomaterials and Sensors、Analytical Chemistry and Sensors、Advanced Chemical Sensor Technologies

This paper reports an original fabrication of a benzene gas sensor based on tungsten disulfide nanoflowers (WS 2 NFs)/zinc oxide hollow spheres (ZnO HMDs) hierarchical nanoheterostructure. The ZnO/WS 2 hierarchical composite was characterized for the inspection of its nanostructure, elementary composition, and surface morphology. The benzene-sensing properties of the ZnO/WS 2 nanofilm sensor were exactly investigated. The results illustrate that the ZnO/WS 2 sensor exhibits a remarkable sensing performance toward benzene gas, including good sensitivity, rapid detection, outstanding repeatability, and stability. This is attributed to the fact that the ZnO/WS 2 nanoheterostructure can dramatically enhance the benzene sensing performance. Furthermore, density functional theory was employed to construct the benzene gas adsorption model for the ZnO/WS 2 heterostructure, from which the determined parameters in geometry, energy, and charge provided a powerful support for the mechanism explanation. This work suggests that the ZnO/WS 2 nanoheterostructure is competent to detect trace benzene gas at room temperature.