| Autor: |
Tian, Weixue, Yang, Ronggui |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 3/1/2007, Vol. 101 Issue 5, p054320-N.Pag, 5p, 2 Diagrams, 3 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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