Length dependent thermal conductivity measurements yield phonon mean free path spectra in nanostructures

Scientific Reports
Hang ZhangA J Minnich

Abstract

Thermal conductivity measurements over variable lengths on nanostructures such as nanowires provide important information about the mean free paths (MFPs) of the phonons responsible for heat conduction. However, nearly all of these measurements have been interpreted using an average MFP even though phonons in many crystals possess a broad MFP spectrum. Here, we present a reconstruction method to obtain MFP spectra of nanostructures from variable-length thermal conductivity measurements. Using this method, we investigate recently reported length-dependent thermal conductivity measurements on SiGe alloy nanowires and suspended graphene ribbons. We find that the recent measurements on graphene imply that 70% of the heat in graphene is carried by phonons with MFPs longer than 1 micron.

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Citations

Dec 23, 2016·Nano Letters·Shyamprasad N RajaDimos Poulikakos
May 14, 2016·Scientific Reports·Abhinav Malhotra, Martin Maldovan
Sep 30, 2016·Scientific Reports·Ashok T RamuJohn E Bowers
Feb 26, 2016·Scientific Reports·Xiaoliang ZhangMing Hu
May 19, 2017·Nature Communications·Roman AnufrievMasahiro Nomura
Sep 15, 2020·Physical Chemistry Chemical Physics : PCCP·Rajmohan Muthaiah, Jivtesh Garg
Feb 13, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Srilok Srinivasan, Ganesh Balasubramanian
Apr 18, 2020·The Journal of Physical Chemistry Letters·Yan YanSarah H Tolbert

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