Graphene Quantum Dots Prepared from Graphene Hydrogels Basing on Hydrothermal Method
Herein, we report a novel method to prepare graphene quantum dots (GQDs) from graphene hydrogels. Various methods of synthesizing GQDs have been reported, such as hydrothermal synthesis, solvothermal, electrochemical methods, microwave technology and the bottom-up method. In our study, graphene hydrogels were prepared using a hydrothermal technique. By immersion of the hydrogels in low-polarity organic solvents, GQDs were released from the hydrogels. This method did not require additional treatments such as the centrifugation, filtration and dialysis in the general hydrothermal process. These GQDs have the strongest emission at ~347 nm.