P2GS.9 - Gas Sensors Based on Metal Oxides Decorated by Reduced Graphene Oxide with Enhanced Gas Sensing Properties

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-2 - Gas Sensors
Y. Gao, B. Zhang, M. Cheng, L. Zhao, G. Lu - State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun (China)
786 - 787


Sensors based on graphene-derived materials have drawn a great deal of attention for the excellent properties of graphene. Theoretically, graphene can detect toxic gases on molecule level. However, its application in actual gas sensors is limited due to the low and irreversible response. Therefore, we synthesized a series of hybrids of metal oxide and reduced graphene oxide (rGO), including SnO2/rGO, ZnO/rGO, In2O3/rGO, -Fe2O3/rGO, and Co3O4/rGO, in which metal oxides were the main components while rGO was employed as decorations. The metal oxides decorated by rGO exhibited enhanced gas sensing properties, especially towards NO2. With optimization, some gas sensors could even work at room temperature, which led to lower energy consumption. As proven in our experiments, the dosages and dispersions of rGO as well as the species and morphologies of metal oxides in hybrids accounted for their gas sensing properties. Specially, rGO played a crucial role in hybrids for response enhancement as its chemical and electronic sensitization. The extra gas absorption and local heterojunctions provided by rGO could also be responsible for the improved sensing properties. These explorations are of exemplary significance for other researchers to develop rGO-based sensitive materials with excellent gas sensing properties in the future.