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Semiballistic thermal conduction in polycrystalline SiGe nanowires
- Source :
- Applied Physics Letters. 115:253101
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- Ballistic heat conduction remains a controversial nanoscale phenomenon because of its occurrence and strength depending on the material, alloy composition, and temperature. Here, we discuss the impact of ballistic thermal conduction and compare the results with theoretical predictions. We experimentally investigate ballistic thermal transport in SiGe polycrystalline nanowires by measuring the length dependence of thermal conductivity for different alloy compositions and temperatures. At room temperature, our experiments show that ballistic effects are negligible in nanowires made of pure polycrystalline Si but become stronger as the Ge composition increases. As we decreased the temperature, we observed that ballistic contribution becomes even stronger.Ballistic heat conduction remains a controversial nanoscale phenomenon because of its occurrence and strength depending on the material, alloy composition, and temperature. Here, we discuss the impact of ballistic thermal conduction and compare the results with theoretical predictions. We experimentally investigate ballistic thermal transport in SiGe polycrystalline nanowires by measuring the length dependence of thermal conductivity for different alloy compositions and temperatures. At room temperature, our experiments show that ballistic effects are negligible in nanowires made of pure polycrystalline Si but become stronger as the Ge composition increases. As we decreased the temperature, we observed that ballistic contribution becomes even stronger.
- Subjects :
- 010302 applied physics
Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
Alloy
Nanowire
02 engineering and technology
engineering.material
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Thermal conduction
Alloy composition
01 natural sciences
Length dependence
Condensed Matter::Materials Science
Thermal conductivity
0103 physical sciences
engineering
Crystallite
0210 nano-technology
Nanoscopic scale
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 115
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........1c4111b38b5f83b5a6f025b8d5b5b406