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Quasi-static 3D structure of graphene ripple measured using aberration-corrected TEM

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Title: Quasi-static 3D structure of graphene ripple measured using aberration-corrected TEM
Authors: Segawa, Yuhiro Browse this author
Yamazaki, Kenji Browse this author
Yamasaki, Jun Browse this author
Gohara, Kazutoshi Browse this author →KAKEN DB
Keywords: graphene
aberration-corrected TEM
3D reconstruction
Issue Date: 21-Mar-2021
Publisher: Royal Society of Chemistry
Journal Title: Nanoscale
Volume: 13
Issue: 11
Start Page: 5847
End Page: 5856
Publisher DOI: 10.1039/d1nr00237f
Abstract: Free-standing graphene has a three-dimensional (3D) structure, called a ripple, rather than a perfect two-dimensional (2D) crystal. Since theoretical calculations suggest that a ripple strongly influences various fundamental physicochemical properties of graphene, it is important to clarify the ripple structure quantitatively in experiments. This paper proposes a new method of measuring the 3D atomic structure of a ripple by using aberration-corrected transmission electron microscopy (TEM). The method utilizes the fact that the 2D contrast of a TEM image is sensitive to the height of a six-membered ring. The proposed method is experimentally applied to a monolayer graphene, and the 3D atomic arrangements of consecutively acquired TEM images are reconstructed. In that experiment, the specimen is found to be moving upward. Furthermore, the atomic arrangement can be approximated as a composite of two structures consisting of a 3D ripple and a 2D plane. The ripple is represented as a superposition of sinusoidal waves, with their wave vectors coinciding with the specific direction of the six-membered ring. The time dependences of the height and lateral size of the ripple are also measured.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 郷原 一寿

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