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Author

Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM

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Evidence of Local Commensurate State with Lattice Match of Graphene on Hexagonal Boron Nitride

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Title
Evidence of Local Commensurate State with Lattice Match of Graphene on Hexagonal Boron Nitride
Author
Kim, Na YeonJeong, Hu YoungKim, Jung HwaKim, GwangwooShin, Hyeon SukLee, Zonghoon
Keywords
boron nitride; commensurate; dark field transmission electron microscopy; graphene; moiré
Issue Date
201707
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.11, no.7, pp.7084 - 7090
Abstract
Transition to a commensurate state changes the local symmetry periodicity on two-dimensional van der Waals superstructures, evoking distinctive properties far beyond individual layers. We investigate the morphology of moire superstructures of graphene on hexagonal boron nitride (hBN) with a low twist angle (approximate to 0 degrees) through moire fringe analyses with dark field transmission electron microscopy. The moire fringes exhibit local variation, suggesting that the interaction between graphene and hBN depends on the stacking configuration and that local transition to the commensurate state occurs through the reduced crystalline mismatch (that is, by lattice stretching and twisting on the graphene lattices). This moire superstructure analysis suggests an inventive method for studying the interaction between stacked van der Waals layers and for discerning the altered electronic and optical properties of graphene on hBN superstructures with a low twist angle, even at low magnification.
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DOI
http://dx.doi.org/10.1021/acsnano.7b02716
ISSN
1936-0851
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UCRF_Journal Papers
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