Bae, Dong Su Kim, Chunghun Lee, Hunsu Khater, Omar Kim, Keun Su Shin, Homin Lee, Kun-Hong Kim, Myung Jong 2024-01-19T12:01:53Z 2024-01-19T12:01:53Z 2022-11-08 2022-05 2196-5404 https://pubs.kist.re.kr/handle/201004/115178 Highly crystalline and few-walled boron nitride nanotubes (BNNTs) had been synthesized by laser ablation using only ammonia borane as a precursor. As a molecular precursor, ammonia borane supplied both B and N atoms with a ratio of 1:1, and BNNTs were formed via the homogeneous nucleation of BN radicals, not the growth from boron nano-droplets, which is a generally accepted growth mechanism of the laser-grown BNNTs. Owing to the absence of amorphous boron impurities, the van der Waals interaction among BNNTs became effective and thus a BNNT fibers was formed spontaneously during the BNNT synthesis. The BNNT growth and the subsequent fiber formation are found to occur only at high pressures of a surrounding gas. The mechanism behind the critical role of pressure was elucidated from the perspective of reaction kinetics and thermal fluid behaviors. A polarized Raman study confirmed that the BNNT fiber formed exhibits a good alignment of BNNTs, which implies great potential for continuous production of high-quality BNNT fibers for various applications. English Springer | Korea Nano Technology Research Society Spontaneous formation of boron nitride nanotube fibers by boron impurity reduction in laser ablation of ammonia borane Article 10.1186/s40580-022-00312-y 1 Nano Convergence, v.9, no.1 Nano Convergence 9 1 Y scie scopus kci 000794973300001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article ELASTIC-MODULUS GROWTH Boron nitride nanotubes Laser ablation Ammonia borane Homogeneous nucleation Spontaneous fiber formation Pressure effect