Multiwalled BN nanotubes are grown from nickel boride catalyst particles by chemical vapor deposition at 1000−1100 °C using borazine, B3N3H6, as the precursor. This precursor is generated in situ from molten salt that forms from mixtures of (NH4)2SO4, NaBH4, and Co3O4 at 300−400 °C. The BN nanotubes have concentric-tube structures, are free of internal closures, have crystalline walls, and exhibit lengths of up to ∼5 μm. The nanotubes often possess bulbous, flag-like, or club-like tip closures. A root-growth mechanism is proposed for the catalyzed process.
boron, Bboron, B I 0055
-018CVD Growth of Boron Nitride Nanotubes. -Carbon-free multiwalled BN nanotubes are grown by chemical vapor deposition (1000-1100 • C, N 2 carrier-gas flow) using B 3 N 3 H 6 as precursor and nickel boride particles as catalyst. The precursor is produced in situ from a solid mixture of (NH 4 ) 2 SO 4 , NaBH 4 , and Co 3 O 4 at 300-400 • C. The deposited nanotubes are characterized by SEM and TEM. They show lengths up to 5 µm, have concentric tube structures free of internal closures and often possess bulbous, flag-like, or club-like tip closures. -(LOURIE, OLEG R.; JONES, CAROLYN R.; BARTLETT, BART M.; GIBBONS, PATRICK C.; RUOFF, RODNEY S.; BUHRO, WILLIAM E.; Chem.
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