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Published December 2009 | Supplemental Material
Journal Article Open

Scanning Tunneling Microscopy Characterization of the Electrical Properties of Wrinkles in Exfoliated Graphene Monolayers


We report on the scanning tunneling microscopy study of a new class of corrugations in exfoliated monolayer graphene sheets, that is, wrinkles ~10 nm in width and ~3 nm in height. We found such corrugations to be ubiquitous in graphene and have distinctly different properties when compared to other regions of graphene. In particular, a "three-for-six" triangular pattern of atoms is exclusively and consistently observed on wrinkles, suggesting the local curvature of the wrinkle provides a sufficient perturbation to break the 6-fold symmetry of the graphene lattice. Through scanning tunneling spectroscopy, we further demonstrate that the wrinkles have lower electrical conductance and are characterized by the presence of midgap states, which is in agreement with recent theoretical predictions. The observed wrinkles are likely important for understanding the electrical properties of graphene.

Additional Information

© 2009 American Chemical Society. Received August 21, 2009; Revised Manuscript Received September 25, 2009. Publication Date (Web): October 23, 2009. We thank Wan Li (Cornell) for helpful discussions and assistance in graphene fabrication. This work was funded by the MARCO Center for Advanced Materials and Devices and by the Department of Energy (DE-FG02-04ER46175).

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Supplemental Material - Xu2009p6653Nano_Lett_supp.pdf


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August 19, 2023
October 19, 2023