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Issue 26, 2018
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Localized electronic structures of graphene oxide studied using scanning tunneling microscopy and spectroscopy

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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.

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

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Publication details

The article was received on 21 Feb 2018, accepted on 06 Jun 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP01168K
Citation: Phys. Chem. Chem. Phys., 2018,20, 17977-17982
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    Localized electronic structures of graphene oxide studied using scanning tunneling microscopy and spectroscopy

    S. Katano, T. Wei, T. Sasajima, R. Kasama and Y. Uehara, Phys. Chem. Chem. Phys., 2018, 20, 17977
    DOI: 10.1039/C8CP01168K

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