Crystal-oriented wrinkles with origami-type junctions in few-layer hexagonal boron nitride.
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Data
2015
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Resumo
Understanding layer interplay is the key to utilizing layered heterostructures
formed by the stacking of different two-dimensional materials for device
applications. Boron nitride has been demonstrated to be an ideal substrate on
which to build graphene devices with improved mobilities. Here we present
studies on the morphology and optical response of annealed few-layer hexagonal
boron nitride flakes deposited on a silicon substrate that reveal the formation of
linear wrinkles along well-defined crystallographic directions. The wrinkles
formed a network of primarily threefold and occasionally fourfold origami-type
junctions throughout the sample, and all threefold junctions and wrinkles
formed along the armchair crystallographic direction. Furthermore, molecular
dynamics simulations yielded, through spontaneous symmetry breaking, wrinkle
junction morphologies that are consistent with both the experimental results and
the proposed origami-folding model. Our findings indicate that this morphology
may be a general feature of several two-dimensional materials under proper
stress-strain conditions, resulting in direct consequences in device strain
engineering.
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2D materials, Origami folding, Annealing
Citação
OLIVEIRA, C. K. B. Q. M de et al. Crystal-oriented wrinkles with origami-type junctions in few-layer hexagonal boron nitride. Nano Research, v. 8, n. 5, p. 1680-1688, 2015. Disponível em: <http://link.springer.com/article/10.1007/s12274-014-0665-y>. Acesso em: 23 jan. 2017.