Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors

Xiulan Zhao; Feng Yang; Junhan Chen; Li Ding; Xiyan Liu; Fengrui Yao; Meihui Li; Daqi Zhang; Zeyao Zhang; Xu Liu; Juan Yang; Kaihui Liu; Yan Li

doi:10.1039/C7NR07855B

Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors†

Xiulan Zhao,^a Feng Yang,^a Junhan Chen,^a Li Ding,^a Xiyan Liu,^a Fengrui Yao,^b Meihui Li,^a Daqi Zhang,^a Zeyao Zhang,^a Xu Liu,^a Juan Yang,^a Kaihui Liu

^b and Yan Li

*^a

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* Corresponding authors

^a Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
E-mail: yanli@pku.edu.cn

^b State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, School of Physics, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China

Abstract

Bimetallic catalysts play important roles in the selective growth of single-walled carbon nanotubes (SWNTs). Using the simple salts (NH₄)₆W₇O₂₄·6H₂O and Co(CH₃COO)₂·4H₂O as precursors, tungsten-cobalt catalysts were prepared. The catalysts were composed of W₆Co₇ intermetallic compounds and tungsten-dispersed cobalt. With the increase of the W/Co ratio in the precursors, the content of W₆Co₇ was increased. Because the W₆Co₇ intermetallic compound can enable the chirality specified growth of SWNTs, the selectivity of the resulting SWNTs is improved at a higher W/Co ratio. At a W/Co ratio of 6 : 4 and under optimized chemical vapor deposition conditions, we realized the direct growth of semiconducting SWNTs with the purity of ∼96%, in which ∼62% are (14, 4) tubes. Using salts as precursors to prepare tungsten-cobalt bimetallic catalysts is flexible and convenient. This offers an efficient pathway for the large-scale preparation of chirality enriched semiconducting SWNTs.

Nanoscale

Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors†

Abstract

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Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors

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