Ballistic to diffusive crossover of heat flow in graphene ribbons

Myung-Ho Bae, Zuanyi Li, Zlatan Aksamija, Pierre N Martin, Feng Xiong, Zhun-Yong Ong, Irena Knezevic and Eric Pop ()
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Myung-Ho Bae: Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign
Zuanyi Li: Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign
Zlatan Aksamija: University of Wisconsin-Madison
Pierre N Martin: University of Illinois at Urbana-Champaign
Feng Xiong: Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign
Zhun-Yong Ong: Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign
Irena Knezevic: University of Wisconsin-Madison
Eric Pop: Micro and Nanotechnology Lab, University of Illinois at Urbana-Champaign

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Heat flow in nanomaterials is an important area of study, with both fundamental and technological implications. However, little is known about heat flow in two-dimensional devices or interconnects with dimensions comparable to the phonon mean free path. Here we find that short, quarter-micron graphene samples reach ~35% of the ballistic thermal conductance limit up to room temperature, enabled by the relatively large phonon mean free path (~100 nm) in substrate-supported graphene. In contrast, patterning similar samples into nanoribbons leads to a diffusive heat-flow regime that is controlled by ribbon width and edge disorder. In the edge-controlled regime, the graphene nanoribbon thermal conductivity scales with width approximately as ~W1.80.3, being about 100 W m−1 K−1 in 65-nm-wide graphene nanoribbons, at room temperature. These results show how manipulation oftwo-dimensional device dimensions and edges can be used to achieve full control of their heat-carrying properties, approaching fundamentally limited upper or lower bounds.

Date: 2013
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DOI: 10.1038/ncomms2755

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