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Issue 41, 2016
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Thermal conductivity of individual silicon nanoribbons

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Abstract

The thermal conductivities of two groups of silicon nanoribbons of ∼20 and ∼30 nm thickness and various widths have been measured and analyzed through combining the Callaway model and the Fuchs–Sondheimer (FS) reduction function. The results show that while the data for the ∼30 nm thick ribbons can be well-explained by the classical size effect, the measured thermal conductivities for the ∼20 nm thick ribbons deviate from the prediction remarkably, and size effects beyond phonon-boundary scattering must be considered. The measurements of the Young's modulus of the thin nanoribbons yield significantly lower values than the corresponding bulk value, which could lead to a reduced phonon group velocity and subsequently thermal conductivity. This study helps to build a regime map for thermal conductivity versus nanostructures’ surface-area-to-volume ratio that clearly delineates two regions where size effects beyond the Casimir limit are important or not important.

Graphical abstract: Thermal conductivity of individual silicon nanoribbons

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Supplementary files

Article information


Submitted
08 Aug 2016
Accepted
22 Sep 2016
First published
23 Sep 2016

Nanoscale, 2016,8, 17895-17901
Article type
Paper

Thermal conductivity of individual silicon nanoribbons

L. Yang, Y. Yang, Q. Zhang, Y. Zhang, Y. Jiang, Z. Guan, M. Gerboth, J. Yang, Y. Chen, D. Greg Walker, T. T. Xu and D. Li, Nanoscale, 2016, 8, 17895
DOI: 10.1039/C6NR06302K

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