Efficient catalytic conversion of ammonia borane to borazine and its use for hexagonal boron nitride (white graphene)
- Efficient catalytic conversion of ammonia borane to borazine and its use for hexagonal boron nitride (white graphene)
- 김성관; 조현진; 김명종; 이희준; 박진형; 이영부; 김환철; 윤창원; 남석우; 강상욱
- Boron Nitride; White Graphene; Borazine; Ammonia Borane; CVD
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 1, NO 6, 1976-1981
- Nickel nanoparticles (NiNPs) prepared in tetraglyme (TG) efficiently catalyzed the conversion of ammonia borane (AB, NH3BH3) to borazine (B3N3H6). Under the optimized conditions, 3 mol% of the NiNPs were introduced into a 1.5 M AB solution in TG and held at 80 °C for 6 h under a dynamic vacuum that was maintained at 30 torr. Borazine was isolated through a series of −45 °C, −78 °C, and −196 °C traps to give (−78 °C trap) pure borazine in 53% yield. The borazine produced was then utilized as a molecular precursor for high quality h-BN (white graphene) and large area h-BN sheets were prepared by applying low pressure chemical vapor deposition (LPCVD). Ultra-thin (single to few layers) h-BN was synthesized on Ni foil at the optimal ratio between borazine and NH3, and the number of layers was tuned by varying the NH3 partial pressure.
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