Design of SnO 2 /ZnO@ZIF‐8 Hydrophobic Nanofibers for Improved H 2 S Gas Sensing

Abstract SnO 2 /ZnO@ZIF‐8 core‐shell nanofibers were synthesized by electrospinning and hydrothermal etching ZnO component of SnO 2 /ZnO nanofibers. It is found that the ZIF‐8 coated SnO 2 /ZnO nanostructures are obtained, and the ZIF‐8 coating can obviously increase the specific surface area of nanofibers. H 2 S sensing properties of the sensors based on composite nanofibers were investigated. The results show that SnO 2 /ZnO@ZIF‐8 core‐shell nanostructures can not only improve the response to H 2 S, but also effectively reduce the interference of ambient humidity on semiconductor gas sensors. The response of the optimal sample to 5 ppm H 2 S can reach 202.3, which is about 19 times higher than that of pure SnO 2 nanofibers. Compared with the response at the ambient humidity of 55 %RH, the response at the ambient humidity of 90 %RH can still maintain 84.7 %. Good selectivity and stability are also observed in our investigations.