Synthesis of Graphene Oxide Using Mildly Oxidized Graphite Through Ultrasonic Exfoliation

Abstract

This study investigated the preparation of graphene oxide from mildly oxidized graphite through ultrasonic exfoliation. Both the original and produced materials were analyzed by ultraviolet-visible spectrophotometer, X-ray di®raction and atomic force microscopy. The results indicated that the exfoliation yield of graphene oxide was proportional to the input ultrasonic energy. In addition, a two-stage exfoliation phenomenon was observed in the exfoliation of mildly oxidized graphite with both ultrasonic homogenizer and cleaner. It also was found that increasing the content of [O] in a C-H 2 SO 4 -[O] reaction system was the most simple and direct method to increase the oxidation degree of graphite oxide.