Phonons and thermal transport in Si/SiO$_2$ multishell nanotubes: Atomistic study
| Autor: | Calina I. Isacova, Vladimir M. Fomin, Alexandr I. Cocemasov, Denis L. Nika |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nanotube
Materials science Phonon phonons Nanowire FOS: Physical sciences 02 engineering and technology lcsh:Technology 01 natural sciences lcsh:Chemistry Cross section (physics) Condensed Matter::Materials Science Thermal conductivity lattice-dynamics approach 0103 physical sciences General Materials Science 010306 general physics lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes Condensed Matter - Materials Science Condensed matter physics Phonon scattering lcsh:T Process Chemistry and Technology multishell nanotubes General Engineering Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Thermal conduction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Boltzmann equation lcsh:QC1-999 Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 thermal transport lcsh:TA1-2040 lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:Physics |
| Zdroj: | Applied Sciences Volume 11 Issue 8 Applied Sciences, Vol 11, Iss 3419, p 3419 (2021) |
| Popis: | Thermal transport in the Si/SiO$_2$ multishell nanotubes is investigated theoretically. The phonon energy spectra are obtained using the atomistic Lattice Dynamics approach. Thermal conductivity is calculated using the Boltzmann transport equation within the relaxation time approximation. Redistribution of the vibrational spectra in multishell nanotubes leads to a decrease of the phonon group velocity and the thermal conductivity as compared to homogeneous Si nanowires. Phonon scattering on the Si/SiO$_2$ interfaces is another key factor of strong reduction of the thermal conductivity in these structures (down to 0.2 W/mK at room temperature). We demonstrate that phonon thermal transport in Si/SiO$_2$ nanotubes can be efficiently suppressed by a proper choice of nanotube's geometrical parameters: lateral cross-section, thickness and number of shells. 14 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|