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Advanced Materials

Encapsulation, Compensation, and Substitution of Catalyst Particles during Continuous Growth of Carbon Nanotubes

Authors

  • R. Xiang,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
    2. Current address: Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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  • G. Luo,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
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  • W. Qian,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
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  • Q. Zhang,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
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  • Y. Wang,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
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  • F. Wei,

    1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084 (P.R. China)
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  • Q. Li,

    1. Cnano Group Limited, 302 Hennessy Rd., Wanchai, Hong Kong (P.R. China)
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  • A. Cao

    1. Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822 (USA)
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  • The work was supported by China National ‘863' Program (No. 2003AA302630), China National Program (No. 2006CB0 N0702), NSFC Key Program (No. 20236020), FANEDD (No. 200548), Key Project of Chinese Ministry of Education (No. 106011), THSJZ, and National Center for Nanoscience and Technology of China (Nanoctr). Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

By sequential feeding of catalyst materials (see figure) it is revealed that the active growth sites are at the bottom of carbon nanotubes (CNTs), and that catalyst particles are constantly encapsulated into the CNTs (see figure). This gives a better insight into the mechanism of CNT formation and on ways to control the growth process. CNTs encapsulating different materials should enable the study of their electronic or magnetic properties, with potential applications as building blocks for nanoelectronics and as fillers in composites for electromagnetic shielding.

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