Self-Powered Humidity Sensor Based on Graphene Oxide Composite Film Intercalated by Poly(Sodium 4‑Styrenesulfonate)

Abstract

This\nResearch Article reports self-powered humidity sensors based\non graphene oxide (GO) and poly­(sodium 4-styrenesulfonate) (PSS)-intercalated\nGO composite films used as the humidity-responsive dielectrics. A\nhydrophilic and electrically-insulating PSS polymer was used as an\nintercalant between the individual GO platelets to enhance the water\npermeation characteristics. Capacitive-type humidity sensors fabricated\nby forming metal electrodes on both sides of the GO and GO-PSS films\nwere installed into the charge pumping system, which can produce a\nvoltage output as a response to humidity sensing. While both sensors\nbased on GO and GO-PSS dielectrics responded stably and reversibly\nto the changes in RH, the GO-PSS sensor showed enhanced sensing responses\ncompared to the GO sensor, providing ∼5.6 times higher voltage\noutput and 3 times faster responses in humidity sensing.