| 초록 |
In this study, n-ZnO nanofibers (NFs) were electronically sensitized by optimal loading of reduced graphene oxide nanosheets (RGO NSs). The RGO NSs-loaded ZnO NFs were comprised of nanograins with an average diameter of 20 nm. The sensing characteristics of RGO NSs-loaded ZnO NFs were examined with respect to various oxidizing and reducing gases, (O2, SO2, NO2, CO, C6H6, and C2H5OH). The sensor responses exhibited a bell-shaped behavior as a function of the weight ratio of RGO NSs. It is remarkable that gas-sensing characteristics were significantly improved and responses were higher than pure n-ZnO NFs. We propose a novel hybrid sensing mechanism for the drastic improvement of sensing behavior by loading RGO NSs into n-ZnO NFs. This hybrid sensing mechanism combines the resistance modulation of both the ZnO-ZnO homointerfaces and that of p-RGO NSs-n-ZnO heterointerfaces in addition to the radial modulation of the surface depletion layer of ZnO NFs. |
