Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging
KAUST Grant NumberKUS-F1-033-02
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AbstractLocal 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.
CitationKundhikanjana W, Lai K, Wang H, Dai H, Kelly MA, et al. (2009) Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging. Nano Lett 9: 3762–3765. Available: http://dx.doi.org/10.1021/nl901949z.
SponsorsWe thank K. Todd for the assistance with pristine graphene, D. Goldhaber-Gordon for useful discussions, and C. Buenviaje-Conggins for the instrumental advice. The research is supported by Center of Probing the Nanoscale (CPN), Stanford University, gift grants from Agilent Technologies, Inc., and DOE Contract DE-FG03-01ER45929-A001. This publication is also based on work supported by Award No. KUS-F1-033-02, made by King Abdullah University of Science and Technology (KAUST) under the global research partnership (GRP) program. CPN is an NSF NSEC, NSF Grant No. PHY-0425897. The work on graphene synthesis is supported by MARCO-MSD, Intel, and ONR.
PublisherAmerican Chemical Society (ACS)
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