Atomically perfect torn graphene edges and their reversible reconstruction

The atomic structure of graphene edges is critical in determining the electrical, magnetic and chemical properties of truncated graphene structures, notably nanoribbons. Unfortunately, graphene edges are typically far from ideal and suffer from atomic-scale defects, structural distortion and uninten...

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Bibliographic Details
Published in:Nature communications 2013-11, Vol.4 (1), p.2723-2723, Article 2723
Main Authors: Kim, Kwanpyo, Coh, Sinisa, Kisielowski, C, Crommie, M. F., Louie, Steven G., Cohen, Marvin L., Zettl, A.
Format: Article
Language:English
Subjects:
639/301/357/918
639/925/930/1032
Electrons
Fourier transforms
Graphene
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Transmission electron microscopy
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Summary:The atomic structure of graphene edges is critical in determining the electrical, magnetic and chemical properties of truncated graphene structures, notably nanoribbons. Unfortunately, graphene edges are typically far from ideal and suffer from atomic-scale defects, structural distortion and unintended chemical functionalization, leading to unpredictable properties. Here we report that graphene edges fabricated by electron beam-initiated mechanical rupture or tearing in high vacuum are clean and largely atomically perfect, oriented in either the armchair or zigzag direction. We demonstrate, via aberration-corrected transmission electron microscopy, reversible and extended pentagon–heptagon (5–7) reconstruction at zigzag edges, and explore experimentally and theoretically the dynamics of the transitions between configuration states. Good theoretical-experimental agreement is found for the flipping rates between 5–7 and 6–6 zigzag edge states. Our study demonstrates that simple ripping is remarkably effective in producing atomically clean, ideal terminations, thus providing a valuable tool for realizing atomically tailored graphene and facilitating meaningful experimental study. The atomic structure of graphene edges is critical in determining their physical and chemical properties, but they are typically far from ideal. Here, the authors fabricate atomically perfect graphene edges via electron beam mechanical rupture or tearing in high vacuum conditions.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms3723