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.
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