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

Date
Authors
Kundhikanjana, Worasom
Lai, Keji
Wang, Hailiang
Dai, Hongjie
Kelly, Michael A.
Shen, Zhi-xun
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
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.
Comment: 12 pages, 4 figures. submitted to Nano Letters
Keywords
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Citation
Collections