期刊
ADVANCED MATERIALS INTERFACES
卷 6, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/admi.201801493
关键词
chemical vapor deposition; h-BN film; h-BN patterns; liquid Cu; self-assembly
资金
- Singapore A*STAR AME IRG [A1783c0011]
- SUTD International Design Center (IDC) grant
The self-assembly into highly ordered pattern is a universal phenomenon with unprecedented natural properties. However, the nonequilibrium processes in complex systems demand rigorous molecular formation mechanism, which are highly important for fundamental research. Herein, a large-scale formation of highly self-assembly hierarchical hexagonal boron nitride (h-BN) superordered structures on a liquid Cu surface by the chemical vapor deposition (CVD) method is demonstrated. The hierarchical h-BN superordered structure is found to be composed of two vertical stacking parts: one part is underneath h-BN film and the other part is top orientated branched h-BN patterns. In addition, the size, orientation, and morphology of the h-BN superordered structures can be precisely tuned by varying the gas flow rate and growth time. A kinetics-limited growth mechanism is proposed to elucidate the formation process, owing a well consistency with experimental results. Further, by mechanically peeling off the top few-layer h-BN, centimeter-scale uniform monolayer h-BN film is produced, demonstrating a direct and facile top-down fabrication method. This synthesis of highly ordered hierarchical h-BN patterns and following uniform monolayer h-BN film can be applied to other 2D materials, paving way for great potential in the investigation of growth mechanism and construction of homo- and heterostructures.
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