TITLE

Analytical model for the boundary scattering phonon mean free path and thermal conductivity of nanowire heterostructures

AUTHOR(S)
Xiang Lü
PUB. DATE
June 2010
SOURCE
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p243109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Boundary scattering phonon mean free path (MFP) is an important parameter for thermal conductivity calculation of nanocomposites. In this work, a simple approximate model is proposed to predict boundary/interface scattering MFP and thermal conductivity of nanowire heterostructures (NWHSs) based on Casimir formalism. Calculated thermal conductivities of Si tubular nanowires and Si/Ge NWHSs agree well with the numerical and analytical solutions of Boltzmann transport equation. It is demonstrated that core/shell layer thickness plays a significant role on tuning NWHS thermal conductivity. The results indicate the approximate model of thermal conductivity can be used for quickly evaluating the thermal behavior of nanocomposites.
ACCESSION #
51526922

 

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