Modification of graphene oxide for applying as mid-infrared photodetector

Abstract

A novel and simple route to create a band gap in graphene through band structure engineering in homogeneous aqueous suspension of chemically synthesized graphene is reported that when fabricated as MID IR detector shows some improved detection parameters. The method for preparing graphene involves sequential chemical synthesis of graphene oxide (GO) suspended in water and then reducing it with hydrazine monohydrate. Adjusting the degree of hydrazine added through reduction process of GO dictates the electronic structure and morphology variation in graphene sheets that has been presented from experimental results in this paper. The obtained samples were studied by FTIR, XRD, AFM and SEM methods. Here, high-dose-hydrazine-reduced graphene oxide (RGO10) is used as metal–graphene–metal MID IR detector, and the results are compared with hydrazine-reduced GO (RGO)-based detector. Results showed that the obtained RGO10-based detector exhibited higher sensitivity and photo-responsivity. The temporal response for this detector is 35 ms rise time. The excellent fast detection and high electrical stability of RGO10 as active material of MID IR detector were attributed to single-step reduction and modification of graphene.