Chirality-dependent growth of single-wall carbon nanotubes as revealed inside nano-test tubes
Chirality-dependent growth of single-wall carbon nanotubes as revealed inside nano-test tubes
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DOI：
10.1039/c7nr01846k
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发表时间：
2017-06-21
期刊：
影响因子：
6.7
通讯作者：
Shiozawa, Hidetsugu
中科院分区：
文献类型：
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作者：
Kharlamova, Marianna V.;Kramberger, Christian;Shiozawa, Hidetsugu
研究了以茂镍为前驱体包裹在模板单壁碳纳米管（SWCNTs）中的生长动力学。利用多激光拉曼光谱技术，测定了（8，8），（12，3），（13，1），（9，6），（10，4），（11，2），（11，1），（9，3）和（9，2）9种单壁碳纳米管在不同温度下原位退火后的生长曲线。数据显示，纳米管生长通过快速和缓慢的反应途径，分别具有高和低的活化能。虽然缓慢生长的活化能是独立的纳米管的手性矢量，快速生长的表现出单调增加的管直径从类似的减少到1.1下降到0.8 nm，并没有依赖于手性角，这可以归因于催化剂簇的大小依赖性的属性。在这项研究中利用的手性依赖的催化生长性能提供了大规模合成的单手性载体单壁碳纳米管的基础。
Growth dynamics of single-wall carbon nanotubes (SWCNTs) have been studied with nickelocene as a precursor encapsulated in the interior of template SWCNTs. By means of multi-laser Raman spectroscopy, growth curves of nine different SWCNTs, (8,8), (12,3), (13,1), (9,6), (10,4), (11,2), (11,1), (9,3) and (9,2), have been determined upon in situ annealing at various temperatures. The data reveal that the nanotubes grow through fast and slow reaction pathways with high and low activation energies, respectively. While the activation energy of the slow growth is independent of the nanotube's chiral vector, that of the fast growth exhibits a monotonic increase as the tube diameter reduces from similar to 1.1 down to 0.8 nm and no dependency on the chiral angle, which can be attributed to the size-dependent properties of catalyst clusters. The chirality dependent catalytic growth properties exploited in this study provide the basis for a large-scale synthesis of single-chiral vector SWCNTs.