Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

Yongping Liao, Kimmo Mustonen*, Semir Tulić, Viera Skákalová, Sabbir A. Khan, Patrik Laiho, Qiang Zhang, Changfeng Li, Mohammad R.A. Monazam, Jani Kotakoski, Harri Lipsanen, Esko I. Kauppinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl3) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl3 doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down to 36 ω/.

Original languageEnglish
Pages (from-to)11522-11529
Number of pages8
JournalACS Nano
Issue number10
Early online date1 Jan 2019
Publication statusPublished - 9 Sep 2019
MoE publication typeA1 Journal article-refereed


  • conductivity
  • graphene
  • transparent and conductive films
  • transport

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  • Projects

    PREIN: Photonics Research and Innovation

    Mäkelä, K.


    Project: Academy of Finland: Other research funding

    CNTstress- Using Carbon Nanotube Materials to Improve the Stress Grading System of an Electrical Machine

    Zhang, Q., Kauppinen, E., Tavakkoli, M., Ahmad, S. & Khan, M.


    Project: Academy of Finland: Other research funding

    2D Layered Materials for Photonics

    Holmi, J., Mustonen, P., Lipsanen, H., Mackenzie, D., Junaid, M., Khayrudinov, V., Mäntynen, H., Seppänen, H., Isakov, K. & Qureshi, M.


    Project: Academy of Finland: Other research funding

    Cite this

    Liao, Y., Mustonen, K., Tulić, S., Skákalová, V., Khan, S. A., Laiho, P., ... Kauppinen, E. I. (2019). Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene. ACS Nano, 13(10), 11522-11529. https://doi.org/10.1021/acsnano.9b05049