Abstract
Ropes consisting of tens of multi-walled boron nitride (BN) nanotubes and extending up to several μm were synthesized through a chemical reaction involving chemical-vapor-deposited multi-walled carbon (C) nanotube oxidation by B 2O 3 mixed with either MoO 3 or V 2O 5 in a flowing N 2 atmosphere. The ropes were analyzed by high-resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS). Tubular shells of BN in the ropes were preferentially assembled in a zigzag form with the [10 1 ̄ 0] direction parallel to the tube/rope axis. Oxidation-induced C nanotube opening at the tip and at wall defects, followed by substitution of C atoms with B and N atoms, and consecutive crystallization of BN shells on the seed nanotubes is thought to underlie the formation mechanism.
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