Nanoscale observation of a single graphene oxide layer using scanning tunneling microscopy

Satoshi Katano, Tao Wei, Takumi Sasajima, Yoichi Uehara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Nano-scale structures of a single graphene oxide (GO) layer deposited on Au(111) covered with the octanethiolate self-assembled monolayer (C8S-SAM) have been investigated by scanning tunneling microscopy (STM). Using a spin-coating method, we found that GO akes are isolated and are dispersed on the C8S-SAM/Au(111) surface whereas these are likely to pile up on the bare Au(111) surface. Furthermore, the C8S-SAM formed on Au(111) enables us to deposit GO keeping the surface clean even if we prepared the sample in the atmosphere. By using the C8S-SAM/Au(111) substrate, we succeeded in observing an STM image of the unreduced GO. The STM image of a single GO layer exhibits the grain-like structure having the range in height from 0.6 to 1.1 nm. The bias-dependent STM study indicated that the STM image of GO is stably and reproducibly obtained at the voltage where the density of states of GO exists.

Original languageEnglish
Pages (from-to)495-498
Number of pages4
JournalJournal of the Vacuum Society of Japan
Issue number12
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Surfaces and Interfaces
  • Spectroscopy


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