• 文献标题:   Friction and conductance imaging of sp(2)- and sp(3)-hybridized subdomains on single-layer graphene oxide
  • 文献类型:   Article
  • 作  者:   LEE H, SON N, JEONG HY, KIM TG, BANG GS, KIM JY, SHIM GW, GODDETI KC, KIM JH, KIM N, SHIN HJ, KIM W, KIM S, CHOI SY, PARK JY
  • 作者关键词:  
  • 出版物名称:   NANOSCALE
  • ISSN:   2040-3364 EI 2040-3372
  • 通讯作者地址:   Inst for Basic Sci Korea
  • 被引频次:   11
  • DOI:   10.1039/c5nr06469d
  • 出版年:   2016

▎ 摘  要

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.