Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep16159
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Funding
- Institute for Basic Science (IBS)
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM)
- National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [IBS-R011-D1, 2011-0030046, 2015R1A1A1A05027585, 2014M3C1A3053024, 2015M3A7B4050455, 2009-0083540]
- National Research Foundation of Korea [2015R1A1A1A05027585, 2015M3A7B4050455] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A monolayer hexagonal boron nitride (h-BN) film with controllable domain morphology and domain size (varying from less than 1 mu m to more than 100 mu m) with uniform crystalline orientation was successfully synthesized by chemical vapor deposition (CVD). The key for this extremely large single crystalline domain size of a h-BN monolayer is a decrease in the density of nucleation seeds by increasing the hydrogen gas flow during the h-BN growth. Moreover, the well-defined shape of h-BN flakes can be selectively grown by controlling Cu-annealing time under argon atmosphere prior to h-BN growth, which provides the h-BN shape varies in triangular, trapezoidal, hexagonal and complex shapes. The uniform crystalline orientation of h-BN from different nucleation seeds can be easily confirmed by polarized optical microscopy (POM) with a liquid crystal coating. Furthermore, seamlessly merged h-BN flakes without structural domain boundaries were evidence by a selective hydrogen etching after a full coverage of a h-BN film was achieved. This seamless large-area and atomic monolayer of single crystalline h-BN film can offer as an ideal and practical template of graphene-based devices or alternative two-dimensional materials for industrial applications with scalability.
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