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Thermal conductivity modeling of compacted nanowire composites

J. Appl. Phys. 101, 054320 (2007); doi:10.1063/1.2653777

Published 15 March 2007

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Weixue Tian and Ronggui Yang
Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado 80309-0427
Nanocomposites may realize a similar thermal conductivity reduction and thermoelectric efficiency enhancement observed in superlattices and thus provide a pathway to scale up the benefits of the nanoscale effects to thermoelectric materials in bulk form. If there are two species, nanocomposites can be in the form of nanoparticles or nanowires of one material specie embedded in another host matrix material, or a discrete mixture of two different kinds of nanoparticles/nanowires that are compacted. A nanocomposite in the form of discrete mixtures of nanowires/nanoparticles does not have a continuous phase of material and may yield even lower thermal conductivity than composites with nanowires/nanoparticles embedded in a host material at the same stoichiometry. In this paper, phonon transport in compacted nanowire composites is investigated using the Monte Carlo simulation. Results show that the thermal conductivity of composites in the form of compacted silicon and germanium nanowire mixtures can be further reduced to around half of the previously studied composites with silicon nanowires embedded in a germanium matrix at the same atomic composition and characteristic size of the nanowires. ©2007 American Institute of Physics
History: Received 9 October 2006; accepted 30 December 2006; published 15 March 2007
Permalink: http://link.aip.org/link/?JAPIAU/101/054320/1
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KEYWORDS and PACS

Keywords
PACS
  • 73.63.-b
    Electronic transport in nanoscale materials and structures
  • 63.22.+m
    Phonons or vibrational states in low-dimensional structures and nanoscale materials
  • 68.35.Ja
    Solid surface and interface dynamics and vibrations
  • 66.70.+f
    Nonelectronic thermal conduction and heat-pulse propagation in solids including thermal waves
  • 68.65.-k
    Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties
  • 61.46.-w
    Nanoscale materials
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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