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Cross‐sectional structural characterization of the surface of exfoliated HOPG using HRTEM‐EELS
Author(s) -
Miyazawa Kun'ichi,
Nagai Takuro,
Kimoto Koji,
Yoshitake Masaru,
Tanaka Yumi
Publication year - 2021
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6875
Subject(s) - highly oriented pyrolytic graphite , materials science , scanning transmission electron microscopy , exfoliation joint , transmission electron microscopy , high resolution transmission electron microscopy , electron energy loss spectroscopy , graphene , substrate (aquarium) , analytical chemistry (journal) , graphite , scanning electron microscope , focused ion beam , nanotechnology , chemistry , composite material , ion , oceanography , organic chemistry , chromatography , geology
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.