Cross-sectional structural characterization of the surface of exfoliated HOPG using HRTEM-EELS

Kun'ichi Miyazawa, Takuro Nagai, Koji Kimoto, Masaru Yoshitake, Yumi Tanaka

Research output: Contribution to journalArticlepeer-review

Abstract

We analyzed the surface atomic structure of highly oriented pyrolytic graphite (HOPG) substrate exfoliated with adhesive tape, using high-resolution transmission electron microscopy and scanning transmission electron microscopy-electron energy-loss spectroscopy (STEM-EELS). The surface step height of the exfoliated HOPG substrate was determined using high-angle annular dark-field-scanning transmission electron microscopy (HAADF-STEM) images and the depth profiles of the EELS spectra of a cross-sectioned thin foil specimen prepared via focused ion beam milling. The exfoliated surface of the HOPG substrate presented disordered and curved graphene layers. The STEM-EELS measurements indicated that upon exfoliation, the surface of the HOPG substrate reacted with atmospheric water and oxygen molecules.

Original languageEnglish
Pages (from-to)84-89
Number of pages6
JournalSurface and Interface Analysis
Volume53
Issue number1
DOIs
Publication statusPublished - Jan 2021

Keywords

  • EELS
  • HOPG
  • HRTEM
  • STEM
  • exfoliation
  • graphene

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