Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging

Details Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging

2009-08-12

arxiv.org/abs/0908.1778v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 4 figures. submitted to Nano Letters

Scientific paper

Local electrical imaging using microwave impedance microscope is performed on graphene in different modalities, yielding a rich hierarchy of the local conductivity. The low-conductivity graphite oxide and its derivatives show significant electronic inhomogeneity. For the conductive chemical graphene, the residual defects lead to a systematic reduction of the microwave signals. In contrast, the signals on pristine graphene agree well with a lumped-element circuit model. The local impedance information can also be used to verify the electrical contact between overlapped graphene pieces.

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