Carbene-Functionalized Single-Walled Carbon Nanotubes and Their Electrical Properties

Authors

  • Chao Liu,

    1. Microelectronics Centre School of Electrical & Electronic Engineering Nanyang Technological University Characterization Lab, S1-B2C-20, 639798 Singapore, Singapore
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  • Qing Zhang,

    Corresponding author
    1. Microelectronics Centre School of Electrical & Electronic Engineering Nanyang Technological University Characterization Lab, S1-B2C-20, 639798 Singapore, Singapore
    • Microelectronics Centre School of Electrical & Electronic Engineering Nanyang Technological University Characterization Lab, S1-B2C-20, 639798 Singapore, Singapore
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  • Francesco Stellacci,

    Corresponding author
    1. Department of Material Science and Engineering Massachusetts Institute of Technology MA 02139, USA
    • Department of Material Science and Engineering Massachusetts Institute of Technology MA 02139, USA.
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  • Nicola Marzari,

    Corresponding author
    1. Department of Material Science and Engineering Massachusetts Institute of Technology MA 02139, USA
    • Department of Material Science and Engineering Massachusetts Institute of Technology MA 02139, USA.
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  • Lianxi Zheng,

    1. Microelectronics Centre School of Electrical & Electronic Engineering Nanyang Technological University Characterization Lab, S1-B2C-20, 639798 Singapore, Singapore
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  • Zhaoyao Zhan

    1. Microelectronics Centre School of Electrical & Electronic Engineering Nanyang Technological University Characterization Lab, S1-B2C-20, 639798 Singapore, Singapore
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Abstract

Pure metallic single-walled carbon nanotubes (m-SWCNTs) are very desirable for many electrode and interconnecting applications. However, the lack of reliable processing techniques to sort m-SWCNTs from the as-synthesized SWCNT samples is an obstacle to these applications. The effects of carbene-based covalent functionalization on the electrical properties of an isolated m-SWCNT, a semiconducting (s)-SWCNT, and a mixture network of both m- and s-SWCNTs are reported. For the first time, a semiconducting-to-metallic SWCNT transition upon dichlorocarbene functionalization is observed. Interestingly, the transition is reversible upon thermal annealing under ambient conditions. The electrical properties of m-SWCNTs remain largely unaffected whereas the on-state conductivity of s-SWCNTs is greatly reduced by this process, in agreement with the relevant theoretical predictions. These findings could pave the way for fabricating large-scale SWCNT-based interconnects and electrodes in full-carbon integrated circuits.

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