p-Ni0.9Zn0.1O/n-ZnO nanosheets heterostructured composite fiber as high-performance H2S detection platform

In this paper, Ni0.9Zn0.1O/ZnO composite fibers were prepared by a combined approach of electrospinning and hydrothermal method for enhanced H2S gas sensing performance. The composite fibers have a diameter of 2 µm and are densely and vertically covered with irregularly shaped nanosheets with a thickness of about 20 nm. When the operating temperature is 100 °C, the maximum response (Ra/Rg) of the Ni0.9Zn0.1O/ZnO sample to 5 ppm H2S is about 450, which is about 15 times of pure ZnO nanofibers gas sensor (∼ 30). Moreover, Ni0.9Zn0.1O/ZnO based gas sensors showed good selectivity and low detection limit (10 ppb) to H2S. The nanosheets structure of Ni0.9Zn0.1O/ZnO composite fibers, as well as the proper energy band structure alignment between Ni0.9Zn0.1O and ZnO, have improved its gas sensing performance.