▎ 摘　　要

A green route using a very simple and straightforward ultrasonic process under alkaline conditions, rather than a general chemical reduction process using hydrazine, was utilized to obtain the hydrophilic reduced graphene oxide(RGO) sheets, via removing oxygen functional groups from graphene oxide(GO) and repairing the aromatic structure. It is found that the conductivity of the obtained RGO could be tuned by changing pH value in alkaline solution, and the current-voltage(I-V) curves of both GO and RGO arc nonlinear and slightly asymmetric. Under the same applied voltage, the current of RGO is much larger than that of GO, indicating a pronounced increase in the electrical conductivity of RGO, compared to that of GO.