Graphene oxide, reduced graphene oxide and composite thin films NO_2 sensing properties

摘要

A graphene oxide (GO), reduced graphene oxide (RGO) and poly(3,4-ethylenedioxytiophene)-reduced graphene oxide (PEDOT-RGO composite) gas sensors were successfully fabricated using an electrodeposition method. The electrodeposition was carried out in aqueous GO dispersions. To obtain RGO and PEDOT-RGO, the electrochemical reduction of GO and PEDOT-GO was carried out in 0.1 M KC1 at a constant potential of-0.85 V. The GO, RGO and PEDOT-RGO composite were characterized by scanning electron microscopy (SEM). The fabricated sensors showed sensitivity to NO_2 gas. In this work the sensing response of GO, RGO and PEDOT-RGO in NO_2 at elevated temperatures were investigated. The influence of the operating temperature on the gas sensing response were compared. The role of the polymer and RGO in PEDOT-RGO composite was discussed. The results are discussed in light of recent literature on graphene sensors.