Kim, Jun Hee Cho, Hyunjin Thang Viet Pham Hwang, Jae Hun Ahn, Seokhoon Jang, Se Gyu Lee, Hunsu Park, Cheol Kim, Cheol Sang Kim, Myung Jong 2024-01-19T19:01:49Z 2024-01-19T19:01:49Z 2021-09-04 2019-10-30 2045-2322 https://pubs.kist.re.kr/handle/201004/119424 The morphological analysis of the end of boron nitride nanotubes (BNNTs) using high-resolution transmission electron microscopy (HR-TEM) can provide valuable insight into the growth mechanism in high temperature pressure (HTP) laser ablation where the best quality of BNNT materials can be obtained so far. Two growth modes of BNNT coexisting during the synthesis process have been proposed based on HR-TEM observation and length analysis. One is the root growth mode, in which boron nitride (BN) species formed via the surface interaction between surrounding N-2 molecules and boron nanodroplets incorporate into the tubular structure. Another mode called open-end growth mode means the prolongation of tube growth from the exposed BN edge surrounding the surface of boron nanodroplets which is constructed by the heterogeneous nucleation of absorbed BN radicals from the gas plume. The statistical data, the proportions of end structures and the length of BNNTs, could be fitted to two growth modes, and the open-end growth mode is found to be especially effective in producing longer nanotubes with a higher growth rate. The scientific understanding of the growth mechanism is believed to provide the control for optimized production of BNNTs. English NATURE PUBLISHING GROUP ELASTIC PROPERTIES VAPORIZATION HYDROGEN MODULUS Dual growth mode of boron nitride nanotubes in high temperature pressure laser ablation Article 10.1038/s41598-019-52247-w 1 SCIENTIFIC REPORTS, v.9 SCIENTIFIC REPORTS 9 scie scopus 000493277900010 2-s2.0-85074253441 Multidisciplinary Sciences Science & Technology - Other Topics Article ELASTIC PROPERTIES VAPORIZATION HYDROGEN MODULUS BNNT Growth Mechanism