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Title: Synthesis of aligned symmetrical multifaceted monolayer hexagonal boron nitride single crystals on resolidified copper
Authors: Tay, Roland Yingjie
Park, Hyo Ju
Ryu, Gyeong Hee
Tan, Dunlin
Tsang, Siu Hon
Li, Hongling
Liu, Wenwen
Teo, Edwin Hang Tong
Lee, Zonghoon
Lifshitz, Yeshayahu
Ruoff, Rodney S.
Keywords: Electron Microscopy
Grain Boundary
Issue Date: 2016
Source: Tay, R. Y., Park, H. J., Ryu, G. H., Tan, D., Tsang, S. H., Li, H., et al. (2016). Synthesis of aligned symmetrical multifaceted monolayer hexagonal boron nitride single crystals on resolidified copper. Nanoscale, 8(4), 2434-2444.
Series/Report no.: Nanoscale
Abstract: Atomically smooth hexagonal boron nitride (h-BN) films are considered as a nearly ideal dielectric interface for two-dimensional (2D) heterostructure devices. Reported mono- to few-layer 2D h-BN films, however, are mostly small grain-sized, polycrystalline and randomly oriented. Here we report the growth of centimetre-sized atomically thin h-BN films composed of aligned domains on resolidified Cu. The films consist of monolayer single crystalline triangular and hexagonal domains with size of up to ∼10 μm. The domains converge to symmetrical multifaceted shapes such as “butterfly” and “6-apex-star” and exhibit ∼75% grain alignment for over millimetre distances as verified through transmission electron microscopy. Scanning electron microscopy images reveal that these domains are aligned for over centimetre distances. Defect lines are generated along the grain boundaries of mirroring h-BN domains due to the two different polarities (BN and NB) and edges with the same termination. The observed triangular domains with truncated edges and alternatively hexagonal domains are in accordance with Wulff shapes that have minimum edge energy. This work provides an extensive study on the aligned growth of h-BN single crystals over large distances and highlights the obstacles that are needed to be overcome for a 2D material with a binary configuration.
ISSN: 2040-3364
DOI: 10.1039/C5NR08036C
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles


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