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Change in thermal conductivity of cylindrical silicon nanowires induced by surface bonding modification
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10.1063/1.2364580
/content/aip/journal/jap/100/9/10.1063/1.2364580
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/9/10.1063/1.2364580

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic illustration of the core-shell structure of a cylindrical nanowire. BOLS effect influences the outermost shell only, yet the core interior remains the bulk material properties. is the radius of the core and the shell has a thickness of three layers .

Image of FIG. 2.
FIG. 2.

The dispersion curves of first five phonon branches for (a) torsional mode and (b) longitudinal mode with , 0.05, 0.10, and 0.15. The phonon frequency in general decreases as increases, in agreement with the findings given in Ref. 23. However, the phonon frequencies for the first branch increase compared to the original one for torsional mode and slightly varies for longitudinal mode with increasing . For the second branch, the phonon frequencies for longitudinal mode show a transition at .

Image of FIG. 3.
FIG. 3.

Temperature dependence of the relative change of thermal conductivity for (a) torsional modes (b) and longitudinal modes for , 0.10, and 0.15.

Image of FIG. 4.
FIG. 4.

Dependence of the relative change of thermal conductivity on the nanowire diameter at for torsional and longitudinal modes. The BOLS effects become more distinctive with the decrease of diameter and more pronounced for torsional mode.

Tables

Generic image for table
Table I.

Shell thickness, Lamé constants, velocities, and parameters related to different scattering mechanisms.

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/content/aip/journal/jap/100/9/10.1063/1.2364580
2006-11-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Change in thermal conductivity of cylindrical silicon nanowires induced by surface bonding modification
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/9/10.1063/1.2364580
10.1063/1.2364580
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