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Tuning the electronic transport properties of graphene through functionalisation with fluorine

Freddie Withers1, Saverio Russo1, Marc Dubois2 and Monica F Craciun3*

Author Affiliations

1 Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Physics building, Exeter EX4 4QF, UK

2 Clermont Université, UBP, Laboratoire des Matériaux Inorganiques, CNRS-UMR 6002, 63177 Aubière, France

3 Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Harrison building, Exeter EX4 4QL, UK

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Nanoscale Research Letters 2011, 6:526  doi:10.1186/1556-276X-6-526

Published: 12 September 2011

Abstract

We demonstrate the possibility to tune the electronic transport properties of graphene mono-layers and multi-layers by functionalisation with fluorine. For mono-layer samples, with increasing the fluorine content, we observe a transition from electronic transport through Mott variable range hopping (VRH) in two dimensions to Efros-Shklovskii VRH. Multi-layer fluorinated graphene with high concentration of fluorine show two-dimensional Mott VRH transport, whereas CF0.28 multi-layer flakes exhibit thermally activated transport through near neighbour hopping. Our experimental findings demonstrate that the ability to control the degree of functionalisation of graphene is instrumental to engineer different electronic properties in graphene materials.