Isacova, CalinaCocemasov, AlexandrNika, DenisFomin, Vladimir2022-02-232022-02-232021ISACOVA, Calina, COCEMASOV, Alexandr, NIKA, Denis, FOMIN, Vladimir. Phonons and thermal transport in Si/SiO2 multishell nanotubes: Atomistic study. In: Applied Sciences. 2021, nr. 11(8), pp. 1-14. ISSN 2076-3417.2076-3417https://doi.org/10.3390/app11083419https://msuir.usm.md/handle/123456789/5714Copyright: © 2021 by the authors.Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/4.0/)Thermal transport in the Si/SiO2 multishell nanotubes is investigated theoretically. The phonon energy spectra are obtained using the atomistic lattice dynamics approach. Thermal conduc- tivity 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/SiO2 interfaces is another key factor of strong reduction of the thermal conduc- tivity in these structures (down to 0.2 Wm−1K−1 at room temperature). We demonstrate that phonon thermal transport in Si/SiO2 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.enmultishell nanotubesphononsthermal transportlattice-dynamics approachArticle