Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Heat Transport Along Polar Nanofilms Due to Surface Phonon-Polaritons

Get access (open in a dialog) DOI: 10.1615/IHTC15.tpp.009664
pages 8901-8907

Abstrakt

Thermal conductivity of nanofilms of SiO2 and SiC due to the propagation of surface phonon-polaritons is comparatively studied. We analytically demonstrate that the thermal conductivity of suspended nanofilms is a linear combination of the inverse first and third powers of the film thickness. It is shown that: i) A 50 nm-thick film of SiC at 500 K has a thermal conductivity of 11.7Wm−1 K−1, which is six times the corresponding one to SiO2. Higher values are found for higher temperatures and thinner films. ii) The difference of permittivities between the substrate and superstrate of a nanofilm can efficiently be used to enhance the propagation length and therefore the thermal conductivity. Polar materials with higher phonon thermal conductivity tend to exhibit higher thermal conductivity due to surface phonon-polariton.