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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>06/2012
<mark>Journal</mark>Nano Letters
Issue number6
Number of pages6
Pages (from-to)2906-2911
<mark>Original language</mark>English


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.