Friction and conductance imaging of sp(2)- and sp(3)-hybridized subdomains on single-layer graphene oxide

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We investigated the subdomain structures of single-layer graphene oxide (GO) by characterizing local friction and conductance using conductive atomic force microscopy. Friction and conductance mapping showed that a single-layer GO flake has subdomains several tens to a few hundreds of nanometers in lateral size. The GO subdomains exhibited low friction (high conductance) in the sp(2)-rich phase and high friction (low conductance) in the sp(3)-rich phase. Current-voltage spectroscopy revealed that the local current flow in single-layer GO depends on the quantity of hydroxyl and carboxyl groups, and epoxy bridges within the 2-dimensional carbon layer. The presence of subdomains with different sp(2)/sp(3) carbon ratios on a GO flake was also confirmed by chemical mapping using scanning transmission X-ray microscopy. These results suggest that spatial mapping of the friction and conductance can be used to rapidly identify the composition of heterogeneous single-layer GO at nanometer scale, which is essential for understanding charge transport in nanoelectronic devices.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2016-01
Language
English
Article Type
Article
Citation

NANOSCALE, v.8, no.7, pp.4063 - 4069

ISSN
2040-3364
DOI
10.1039/c5nr06469d
URI
http://hdl.handle.net/10203/207784
Appears in Collection
CH-Journal Papers(저널논문)EE-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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