Inner-diameter enlargement of multi-walled carbon nanotubes by adding HBO3 in catalyst |
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| Authors: | Yan Pan Yunfang Liu Weidong Chi Zengmin Shen |
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| Affiliation: | 1. Hunan Key Laboratory for Computation and Simulation in Science and Engineering, School of Mathematics and Computational Science, Xiangtan University, Hunan 411105, People''s Republic of China;2. Hunan Key Laboratory for Micro–Nano Energy Materials and Devices, School of Physics and Optoelectronic Engineering, Xiangtan University, Hunan 411105, People''s Republic of China |
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| Abstract: | Multi-walled carbon nanotubes (MWCNTs) with large inner diameter were synthesized by the catalytic chemical vapor deposition method using HBO3 as the accessorial catalyst in reaction precursors. A ratio Din/Dout is defined as an index to evaluate the hollow degree of MWCNTs, where Din and Dout are the inner and outer diameter of one CNT, respectively. When no HBO3 was added in the reaction mixtures, the MWCNTs are straight with thick wall. The average Din/Dout value is only 0.08 ± 0.02. The X-ray diffraction (XRD) result shows the relatively low crystallinity. When HBO3 was added in the reaction precursors, the MWCNTs have large inner cavity and the average Din/Dout value reaches 0.57 ± 0.10. The crystallinity was also improved remarkably. These results indicate that HBO3 in the catalyst system has great influence on the growth of MWCNTs. |
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