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Conductivity enhancement in single-walled carbon nanotube bundles doped with K and Br

Author

Listed:
  • R. S. Lee

    (University of Pennsylvania)

  • H. J. Kim

    (University of Pennsylvania)

  • J. E. Fischer

    (University of Pennsylvania)

  • A. Thess

    (Center for Nanoscale Science and Technology, Rice University)

  • R. E. Smalley

    (Center for Nanoscale Science and Technology, Rice University)

Abstract

Single-walled carbon nanotubes (SWNTs), prepared by metal-catalysed laser ablation of graphite, form close-packed bundles or ‘ropes;1. These rope crystallites exhibit metallic behaviour above 50K (ref. 2), and individual tubes behave as molecular wires, exhibiting quantum effects at low temperatures3,4. They offer an all-carbon host lattice that, by analogy with graphite5 and solid C60 (ref. 6), might form intercalation compounds with interesting electronic properties, such as enhanced electrical conductivity and superconductivity. Multi-walled nanotube materials have been doped with alkali metals7 and FeCl3 (ref. 8). Here we report the doping of bulk samples of SWNTs by vapour-phase reactions with bromine and potassium—a prototypical electron acceptor and donor respectively. Doping decreases the resistivity at 300K by up to a factor of 30, and enlarges the region where the temperature coefficient of resistance is positive (the signature of metallic behaviour). These results suggest that doped SWNTs represent a new family of synthetic metals.

Suggested Citation

  • R. S. Lee & H. J. Kim & J. E. Fischer & A. Thess & R. E. Smalley, 1997. "Conductivity enhancement in single-walled carbon nanotube bundles doped with K and Br," Nature, Nature, vol. 388(6639), pages 255-257, July.
    • Handle: RePEc:nat:nature:v:388:y:1997:i:6639:d:10.1038_40822
    DOI: 10.1038/40822
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    Cited by:

    1. Sandeep Kumar Maurya & Hazel Rose Galvan & Gaurav Gautam & Xiaojie Xu, 2022. "Recent Progress in Transparent Conductive Materials for Photovoltaics," Energies, MDPI, vol. 15(22), pages 1-25, November.
    2. Monika Rdest & Dawid Janas, 2021. "Carbon Nanotube Films for Energy Applications," Energies, MDPI, vol. 14(7), pages 1-27, March.
    3. Hong Wang & Kuncai Li & Xin Hao & Jiahao Pan & Tiantian Zhuang & Xu Dai & Jing Wang & Bin Chen & Daotong Chong, 2024. "Capillary compression induced outstanding n-type thermoelectric power factor in CNT films towards intelligent temperature controller," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    4. Hong Wang & Xu Sun & Yizhuo Wang & Kuncai Li & Jing Wang & Xu Dai & Bin Chen & Daotong Chong & Liuyang Zhang & Junjie Yan, 2023. "Acid enhanced zipping effect to densify MWCNT packing for multifunctional MWCNT films with ultra-high electrical conductivity," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    5. Shohei Horike & Qingshuo Wei & Kouki Akaike & Kazuhiro Kirihara & Masakazu Mukaida & Yasuko Koshiba & Kenji Ishida, 2022. "Bicyclic-ring base doping induces n-type conduction in carbon nanotubes with outstanding thermal stability in air," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    6. Pang-Leen Ong & Igor A. Levitsky, 2010. "Organic / IV, III-V Semiconductor Hybrid Solar Cells," Energies, MDPI, vol. 3(3), pages 1-22, March.

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