▎ 摘　　要

In this paper, ZnFe2O4 nanorods were prepared using Zn/Fe metal organic framework (MOF) as precursors, and ZnFe2O4/reduced graphene oxide (rGO) was prepared by hydrothermal method. The morphology and composition of the ZnFe2O4/rGO nanocomposite were characterized, and the results showed that the MOF-derived ZnFe2O4 nanorods are uniformly modified on the surface of rGO. The ZnFe2O4/rGO nanocomposite exhibits better SO2 gas sensing performance than the single ZnFe2O4 nanorods at room temperature. The sensing characteristics of single ZnFe2O4 film sensor, single rGO film sensor and ZnFe2O4/rGO composite film sensor at SO2 gas concentration (1 x 10(-6)-100 x 10(-6)) were tested. The response of ZnFe2O4/rGO composite sensor can reach 18.32% at room temperature. Compared with single ZnFe2O4 and rGO film sensors, the ZnFe2O4/rGO composite sensor has better transient response, good sensitivity and selectivity. In this work, the improvement of the sensor performance is not only due to the p-n heterostructure between ZnFe2O4 nanorods and rGO nanosheets, but also to the excellent electrical properties of rGO. It provides a new idea for the detection of SO2 at room temperature.