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Subnanometer Vacancy Defects Introduced on Graphene by Oxygen Gas
journal contribution
posted on 2014-02-12, 00:00 authored by Yasuhiro Yamada, Kazumasa Murota, Ryo Fujita, Jungpil Kim, Ayuko Watanabe, Masashi Nakamura, Satoshi Sato, Kenji Hata, Peter Ercius, Jim Ciston, Cheng
Yu Song, Kwanpyo Kim, William Regan, Will Gannett, Alex ZettlThe basal plane of graphene has been
known to be less reactive
than the edges, but some studies observed vacancies in the basal plane
after reaction with oxygen gas. Observation of these vacancies has
typically been limited to nanometer-scale resolution using microscopic
techniques. This work demonstrates the introduction and observation
of subnanometer vacancies in the basal plane of graphene by heat treatment
in a flow of oxygen gas at low temperature such as 533 K or lower.
High-resolution transmission electron microscopy was used to directly
observe vacancy structures, which were compared with image simulations.
These proposed structures contain CO, pyran-like ether, and
lactone-like groups.