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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Double-Spiral Hexagonal Boron Nitride and Shear Strained Coalescence Boundary

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Title
Double-Spiral Hexagonal Boron Nitride and Shear Strained Coalescence Boundary
Author
Park, Hyo JuTay, Roland YingjieWang, XiaoZhao, WenKim, Jung HwaRuoff, Rodney S.Ding, FengTeo, Edwin Hang TongLee, Zonghoon
Issue Date
2019-07
Publisher
American Chemical Society
Citation
NANO LETTERS, v.19, no.7, pp.4229 - 4236
Abstract
Among the different growth mechanisms for two-dimensional (2D) hexagonal boron nitride (h-BN) synthesized using chemical vapor deposition, spiraling growth of h-BN has not been reported. Here we report the formation of intertwined double-spiral few-layer h-BN that is driven by screw dislocations located at the antiphase boundaries of monolayer domains. The microstructure and stacking configurations were studied using a combination of dark-field and atomic resolution transmission electron microscopy. Distinct from other 2D materials with single-spiral structures, the double-spiral structure enables the intertwined h-BN layers to preserve the most stable AA′ stacking configuration. We also found that the occurrence of shear strains at the boundaries of merged spiral islands is dependent on the propagation directions of encountering screw dislocations and presented the strained features by density functional theory calculations and atomic image simulations. This study unveils the double-spiral growth of 2D h-BN multilayers and the creation of a shear strain band at the coalescence boundary of two h-BN spiral clusters.
URI
https://scholarworks.unist.ac.kr/handle/201301/26475
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.8b05034
DOI
10.1021/acs.nanolett.8b05034
ISSN
1530-6984
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