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    Simultaneous Visualization of Graphene Grain Boundaries and Wrinkles with Structural Information by Gold Deposition
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    † Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea
    § ‡Department of Chemistry and §Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
    *Address correspondence to K.S.K. ([email protected]) J.K.K. ([email protected]).
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    ACS Nano

    Cite this: ACS Nano 2014, 8, 8, 8662–8668
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    https://doi.org/10.1021/nn503550d
    Published August 12, 2014
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    Although line defects such as grain boundaries (GBs) and wrinkles are unavoidable in graphene, difficulties in identification preclude studying their impact on electronic and mechanical properties. As previous methods focus on a single type of line defect, simultaneous measurements of both GBs and wrinkles with detailed structural information have not been reported. Here, we introduce effective visualization of both line defects by controlled gold deposition. Upon depositing gold on graphene, single lines and double lines of gold nanoparticles (NPs) are formed along GBs and wrinkles, respectively. Moreover, it is possible to analyze whether a GB is stitched or overlapped, whether a wrinkle is standing or folded, and the width of the standing collapsed wrinkle. Theoretical calculations show that the characteristic morphology of gold NPs is due to distinct binding energies of line defects, which are correlated to disrupting diffusion of NPs. Our approach could be further exploited to investigate the defect structures of other two-dimensional materials.

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    ACS Nano

    Cite this: ACS Nano 2014, 8, 8, 8662–8668
    Click to copy citationCitation copied!
    https://doi.org/10.1021/nn503550d
    Published August 12, 2014
    Copyright © 2014 American Chemical Society
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