Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices

Details Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices

2012-01-20

arxiv.org/abs/1201.4384v1

Nano Letters, 11, 4047 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

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.

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