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Spontaneous formation of boron nitride nanotube fibers by boron impurity reduction in laser ablation of ammonia borane.
- Source :
- Nano Convergence; 5/12/2022, Vol. 9 Issue 1, p1-10, 10p
- Publication Year :
- 2022
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21965404
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nano Convergence
- Publication Type :
- Academic Journal
- Accession number :
- 156889263
- Full Text :
- https://doi.org/10.1186/s40580-022-00312-y