Microbalance Humidity Sensors Based on Electrospun graphene oxide composites

In this paper, graphene oxide (GO) based electrospun nanofiber composites were prepared as sensitive materials for quartz crystal microbalance (QCM) humidity sensors. As GO cannot be electrospun directly, polymethylmethacrylate (PMMA) and polystyrene (PS) were used as the polymer support respectively in the fabrication process. The effect of GO doping concentration on the humidity sensitivity of the composite was also investigated. The test results show that the doped GO can enhance the sensitivity of the polymer nanofibers. Among all the composites, 20%PS doped with 0.5%GO which was electrospun at 18kV for 5min has the best performance. When the humidity ranges from 30%RH to 90%RH, the sensitivity of the sample is about 21.7Hz/%RH and the response/recovery time is only 29s/4s.