Direct nanoscale imaging of ballistic and diffusive thermal transport in graphene nanostructures

Manuel E. Pumarol, Mark C. Rosamond, Peter Tovee, Michael C. Petty, Dagou A. Zeze, Vladimir Falko, Oleg V. Kolosov

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We report direct imaging of nanoscale thermal transport in single and few-layer graphene with approximately 50 nm lateral resolution using high vacuum scanning thermal microscopy. We observed increased heat transport in suspended graphene where heat is conducted by ballistic phonons, compared to adjacent areas of supported graphene, and observed decreasing thermal conductance of supported graphene with increased layer number. Our nanothermal images suggest a mean-free-path of thermal phonons in supported graphene below 100 nm.

    Original languageEnglish
    Pages (from-to)2906-2911
    Number of pages6
    JournalNano Letters
    Volume12
    Issue number6
    DOIs
    Publication statusPublished - 13 Jun 2012

    Keywords

    • ballistic phonons
    • graphene
    • nanoscale imaging
    • Nanoscale thermal transport
    • scanning thermal microscopy
    • thermal conductivity

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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