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Friction and conductance imaging of sp2- and sp3-hybridized subdomains on single-layer graphene oxide

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Title
Friction and conductance imaging of sp2- and sp3-hybridized subdomains on single-layer graphene oxide
Author(s)
Hyunsoo Lee; Son N.; Jeong H.Y.; Kim T.G.; Bang G.S.; Kim J.Y.; Shim G.W.; Kalyan C. Goddeti; Jong Hun Kim; Kim N.; Shin H.-J.; Kim W.; Kim S.; Choi S.-Y.; Jeong Young Park
Publication Date
2016-02
Journal
NANOSCALE, v.8, no.7, pp.4063 - 4069
Publisher
ROYAL SOC CHEMISTRY
Abstract
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 sp2-rich phase and high friction (low conductance) in the sp3-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 sp2/sp3 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. © The Royal Society of Chemistry 2016
URI
https://pr.ibs.re.kr/handle/8788114/2685
ISSN
2040-3364
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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