▎ 摘　　要

We have shown that nitrophenyl groups may be added to the surface of few-layer epitaxial graphene (EG) by the formation of covalent carbon-carbon bonds thereby changing the electronic structure and transport properties of EG from near-metallic to semiconducting. In the present Letter we discuss the opportunities afforded by such chemical processes to engineer device functionality in graphene by modification of the electronic properties without physical patterning. (c) 2009 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim