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

Worasom Kundhikanjana, Keji Lai, Hailiang Wang, Hongjie Dai, Michael A. Kelly, Zhi-xun Shen

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

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. © 2009 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)3762-3765
Number of pages4
JournalNano Letters
Volume9
Issue number11
DOIs
StatePublished - Nov 11 2009
Externally publishedYes

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