Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study
Thermal transport in the Si/SiO<sub>2</sub> 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 appro...
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MDPI AG
2021-04-01
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| Series: | Applied Sciences |
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| author | Calina Isacova Alexandr Cocemasov Denis L. Nika Vladimir M. Fomin |
| author_facet | Calina Isacova Alexandr Cocemasov Denis L. Nika Vladimir M. Fomin |
| author_sort | Calina Isacova |
| collection | DOAJ |
| description | Thermal transport in the Si/SiO<sub>2</sub> 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<sub>2</sub> interfaces is another key factor of strong reduction of the thermal conductivity in these structures (down to 0.2 Wm<sup>−1</sup>K<sup>−1</sup> at room temperature). We demonstrate that phonon thermal transport in Si/SiO<sub>2</sub> nanotubes can be efficiently suppressed by a proper choice of nanotube geometrical parameters: lateral cross section, thickness and number of shells. We argue that such nanotubes have prospective applications in modern electronics, in cases when low heat conduction is required. |
| first_indexed | 2024-03-10T12:26:13Z |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T12:26:13Z |
| publishDate | 2021-04-01 |
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| spelling | doaj.art-92375e4269f5401f89e2796f6668764b2023-11-21T15:03:09ZengMDPI AGApplied Sciences2076-34172021-04-01118341910.3390/app11083419Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic StudyCalina Isacova0Alexandr Cocemasov1Denis L. Nika2Vladimir M. Fomin3E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, MoldovaE. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, MoldovaE. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, MoldovaE. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, MoldovaThermal transport in the Si/SiO<sub>2</sub> 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<sub>2</sub> interfaces is another key factor of strong reduction of the thermal conductivity in these structures (down to 0.2 Wm<sup>−1</sup>K<sup>−1</sup> at room temperature). We demonstrate that phonon thermal transport in Si/SiO<sub>2</sub> nanotubes can be efficiently suppressed by a proper choice of nanotube geometrical parameters: lateral cross section, thickness and number of shells. We argue that such nanotubes have prospective applications in modern electronics, in cases when low heat conduction is required.https://www.mdpi.com/2076-3417/11/8/3419multishell nanotubesphononsthermal transportlattice-dynamics approach |
| spellingShingle | Calina Isacova Alexandr Cocemasov Denis L. Nika Vladimir M. Fomin Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study Applied Sciences multishell nanotubes phonons thermal transport lattice-dynamics approach |
| title | Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study |
| title_full | Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study |
| title_fullStr | Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study |
| title_full_unstemmed | Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study |
| title_short | Phonons and Thermal Transport in Si/SiO<sub>2</sub> Multishell Nanotubes: Atomistic Study |
| title_sort | phonons and thermal transport in si sio sub 2 sub multishell nanotubes atomistic study |
| topic | multishell nanotubes phonons thermal transport lattice-dynamics approach |
| url | https://www.mdpi.com/2076-3417/11/8/3419 |
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