Sulfur dioxide sensing properties of MOF‐derived ZnFe <sub>2</sub> O <sub>4</sub> functionalized with reduced graphene oxide at room temperature
Lanjuan Zhou, Xixi Zhang, Wenyuan Zhang
Abstract
Abstract In this paper, ZnFe 2 O 4 nanorods were prepared using Zn/Fe metal organic framework (MOF) as precursors, and ZnFe 2 O 4 /reduced graphene oxide (rGO) was prepared by hydrothermal method. The morphology and composition of the ZnFe 2 O 4 /rGO nanocomposite were characterized, and the results showed that the MOF‐derived ZnFe 2 O 4 nanorods are uniformly modified on the surface of rGO. The ZnFe 2 O 4 /rGO nanocomposite exhibits better SO 2 gas sensing performance than the single ZnFe 2 O 4 nanorods at room temperature. The sensing characteristics of single ZnFe 2 O 4 film sensor, single rGO film sensor and ZnFe 2 O 4 /rGO composite film sensor at SO 2 gas concentration (1 × 10 −6 –100 × 10 −6 ) were tested. The response of ZnFe 2 O 4 /rGO composite sensor can reach 18.32% at room temperature. Compared with single ZnFe 2 O 4 and rGO film sensors, the ZnFe 2 O 4 /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 ZnFe 2 O 4 nanorods and rGO nanosheets, but also to the excellent electrical properties of rGO. It provides a new idea for the detection of SO 2 at room temperature.