Aryl Functionalization as a Route to Band Gap Engineering in Single   Layer Graphene Devices
  Chemical functionalization is a promising route to band gap engineering of graphene. We chemically grafted nitrophenyl groups onto exfoliated single-layer graphene sheets in the form of substrate-supported or free-standing films. Our transport measurements demonstrate that non-suspended functionalized graphene behaves as a granular metal, with variable range hopping transport and a mobility gap ~ 0.1 eV at low temperature. For suspended graphene that allows functionalization on both surfaces, we demonstrate tuning of its electronic properties from a granular metal to a gapped semiconductor, in which charge transport occurs via thermal activation over a gap ~ 80 meV. This non-invasive and scalable functionalization technique paves the way for CMOS-compatible band gap engineering of graphene electronic devices. 
Hang Zhang, Elena Bekyarova, Jhao-Wun Huang, Zeng Zhao, Wenzhong Bao,   Fenglin Wang, Robert C. Haddon and Chun Ning Lau
cond-mat.mes-hall