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Engineering the electronic properties of graphene has triggered greatinterest for potential applications in electronics and opto-electronics. Herewe demonstrate the possibility to tune the electronic transport properties ofgraphene monolayers and multilayers by functionalisation with fluorine. We showthat by adjusting the fluorine content different electronic transport regimescan be accessed. For monolayer samples, with increasing the fluorine content,we observe a transition from electronic transport through Mott variable rangehopping in two dimensions to Efros - Shklovskii variable range hopping.Multilayer fluorinated graphene with high concentration of fluorine showtwo-dimensional Mott variable range hopping transport, whereas CF0.28multilayer flakes have a band gap of 0.25eV and exhibit thermally activatedtransport. Our experimental findings demonstrate that the ability to controlthe degree of functionalisation of graphene is instrumental to engineerdifferent electronic properties in graphene materials.

Tuning the electronic transport properties of graphene through functionalisation with fluorine