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 are 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.
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 are 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.
基金
Supported by the National Natural Science Foundation of China(Nos.50525204, 50832001)
the Special PhD Program of Ministry of Education, China(No.200801830025)
the Program for Changjiang Scholars and Innovative Research Team in University of China
the "211" and "985" Project of Jilin University, China
