Direct Nanoscale Imaging of Ballistic and Diffusive Thermal Transport in Graphene Nanostructures

作者：Pumarol Manuel E; Rosamond Mark C; Tovee Peter; Petty Michael C; Zeze Dagou A; Falko Vladimir; Kolosov Oleg V^*

来源：Nano Letters, 2012, 12(6): 2906-2911.

DOI：10.1021/nl3004946

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

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.

• 出版日期2012-6