▎ 摘　　要

A facile chemical oxidation and exfoliation method has been developed to prepare luminescent graphene quantum dots (GQDs) using commercial carbon fibers as the raw material, which were synthesized from pitch through an annealing process at 1500 degrees C. The as-prepared GQDs, in the thickness range of 1-2 graphene layers, exhibit an excitation-independent photoluminescence (PL) behavior similar to that of semiconductor quantum dots, and can be dissolved in water and common polar solvents. This approach has enabled a simple and effective way for production of the GQDs solution, which could be separated into blue and green photoluminescence (PL) GQDs with different dialysis bags. (C) 2012 Elsevier B.V. All rights reserved.