Localized electronic structures of graphene oxide studied using scanning tunneling microscopy and spectroscopy

Satoshi Katano, Tao Wei, Takumi Sasajima, Ryuhei Kasama, Yoichi Uehara

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We have used scanning tunneling microscopy (STM) to elucidate the nanoscale electronic structures of graphene oxide (GO). The unreduced GO layer was imaged using STM without reduction processes when deposited on a Au(111) surface covered with an octanethiolate self-assembled monolayer (C8S-SAM). The STM image of the GO sheet exhibits a grainy structure having a thickness of about 1 nm, which is in good agreement with the previous results obtained using atomic force microscopy (AFM). We found that the C8S-SAM suppresses the adsorption of water remaining on the substrate, which would be important to accomplish the nanoscale imaging of the unreduced GO by STM. Furthermore, we successfully detected the π and π∗ states localized in the GO sheet using scanning tunneling spectroscopy (STS). The π-π∗ gap energy and the gap center are not uniform within the GO sheet, indicating the existence of various sizes of the sp2 domain and evidence for the local electronic doping by the substituents.

Original languageEnglish
Pages (from-to)17977-17982
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number26
DOIs
Publication statusPublished - 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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