High-sensitivity resistive humidity sensor based on graphitic carbon nitride nanosheets and its application

Abstract

Currently, most humidity sensors have problems such as narrow measurement range, long response time and poor reversibility. In this work, we developed a resistive humidity sensor based on graphitic carbon nitride (g-C3N4) nanosheet film on epoxy substrate with Cu/Ni electrodes. The structure, morphology and composition properties of the g-C3N4 were analyzed by XRD, SEM, TEM, FTIR and XPS. The humidity sensing results show that the g-C3N4 film sensor has the advantages of high sensitivity (6457548.8 Ω/%RH), good reversibility and fast response/recovery time (0.3/8.5 s). The humidity sensing performance of g-C3N4 overpasses the other sensors based on graphene oxide (GO), ZnO, anodic aluminum oxide (AAO), SnO2, Bi6S2O15 and common composites. The g-C3N4 film sensor exhibits great application prospect in humidity alarm device, automatic diaper alarm and non-contact testing of cultural relics, which have advantages such as strong anti-interference capability, low cost and easy to use.