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Issue 15, 2018
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Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors

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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.

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

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Publication details

The article was received on 22 Oct 2017, accepted on 22 Feb 2018 and first published on 24 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR07855B
Citation: Nanoscale, 2018,10, 6922-6927
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    Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors

    X. Zhao, F. Yang, J. Chen, L. Ding, X. Liu, F. Yao, M. Li, D. Zhang, Z. Zhang, X. Liu, J. Yang, K. Liu and Y. Li, Nanoscale, 2018, 10, 6922
    DOI: 10.1039/C7NR07855B

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