▎ 摘　　要

The influence of spin in reduced graphene oxide (RGO) is demonstrated through a temperature dependent metal-insulator transition in resistance (at similar to 30 K) as well as high field magneto-resistance (MR) measurements. RGO samples, prepared using an unconventional organic acid reduction method, showed a quadratic temperature dependence of resistance at low temperatures, which changed to a logarithmic dependence at higher temperatures. Analysis of these features in RGO, combined with negative MR which scales with a Kondo characteristic temperature, establishes the interaction between conduction electrons propagating through intact graphene nano-islands and localized magnetic moments found in disordered regions. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim