▎ 摘　　要

Reduced graphene oxide (rGO) and highly reduced chemically converted graphene (rCCG) samples were prepared under different processing conditions and were doped into MgB2 by a diffusion process at 800 degrees C for 10 hours. It was demonstrated that a small addition rCCG can significantly improve the superconducting properties of MgB2. Doping of MgB2 with 1 mol% of rCCG resulted in a J(c) of 5.45 x 10(5) A cm(-2) at 20 K in self-fields, which is nearly 32% improvement over that of the undoped sample. This is a significant improvement as most carbon sources adversely affect the J(c) performance at the zero field.