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

Pumarol Crestar, Manuel and Rosamond, Mark C. and Tovee, Peter and Petty, Michael C. and Zeze, Dagou A. and Falko, Vladimir and Kolosov, Oleg V. (2012) Direct nanoscale imaging of ballistic and diffusive thermal transport in graphene nanostructures. Nano letters, 12 (6). pp. 2906-2911. ISSN 1530-6984

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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.

Item Type: Article
Journal or Publication Title: Nano letters
Uncontrolled Keywords: Nanoscale thermal transport ; nanoscale imaging ; ballistic phonons ; thermal conductivity ; graphene ; scanning thermal microscopy
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 57118
Deposited By: ep_importer_pure
Deposited On: 14 Aug 2012 16:35
Refereed?: Yes
Published?: Published
Last Modified: 27 Jan 2014 11:21
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57118

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