▎ 摘　　要

Chemically modified graphene was synthesized by chemical vapour deposition (CVD) with ammonia gas introduced during the CVD process. The use of two different metal catalyst films [nickel (Ni) or copper (Cu)] results in distinctly different forms of structural defects in the honeycomb lattice of graphene under identical synthesis conditions. The Ni catalyst film gave rise to numerous "flower-like" defects, where carbon atoms formed core hexagons surrounded by pentagons alternated with heptagons, whilst graphene grown on a Cu catalyst film contained a much higher concentration of substituted nitrogen atoms. The samples were characterized by a variety of spectroscopic and microscopic methods complemented with electrical transport measurements. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim