Superior Hydrogen Sensing Property of Porous NiO/SnO2 Nanofibers Synthesized via Carbonization

In this paper, the porous NiO/SnO2nanofibers were synthesized via the electrospinning method along with the carbonization process. The characterization results show that the pristine SnO2-based nanofibers can form porous structure with different grain size by carbonization. The hydrogen gas-sensing investigations indicate that the NiO/SnO2sensor exhibits more prominent sensing properties than those of pure SnO2sensor devices. Such enhanced performance is mainly attributed to the porous nanostructure, which can provide large active adsorption sites for surface reaction. Moreover, the existence of p-n heterojunctions between NiO and SnO2also plays a key role in enhancing gas-sensing performances. Finally, the H2sensing mechanism based on the NiO/SnO2nanocomposite was proposed for developing high-performance gas sensor devices.Keywords:NiO/SnO2nanofibers;p-n heterojunctions;porous nanostructure;H2sensor