Fig. 5From: Spontaneous formation of boron nitride nanotube fibers by boron impurity reduction in laser ablation of ammonia boraneMechanism of nucleus formation of BNNT synthesis. a At low pressure, B-N radicals bond each other quickly, and h-BN forms in a lateral direction. b At high pressure, lateral growth of h-BN is inhibited by surrounding gas, so curved h-BN forms, and can nucleate BNNT synthesisBack to article page