| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Determination of Thermal Properties of Unsmooth Si Nanowires |
| Shixian Liu, Alexander A. Barinov*, Fei Yin, and Vladimir I. Khvesyuk |
| Department of Thermophysics, Bauman Moscow State Technical University, Moscow 105005, Russian Federation |
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| Cite this article: |
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Shixian Liu, Alexander A. Barinov, Fei Yin et al 2024 Chin. Phys. Lett. 41 016301 |
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Abstract We estimate the thermal properties of unsmooth Si nanowires, considering key factors such as size (diameter), surface texture (roughness) and quantum size effects (phonon states) at different temperatures. For nanowires with a diameter of less than 20 nm, we highlight the importance of quantum size effects in heat capacity calculations, using dispersion relations derived from the modified frequency equation for the elasticity of a rod. The thermal conductivities of nanowires with diameters of 37, 56, and 115 nm are predicted using the Fuchs–Sondheimer model and Soffer's specular parameter. Notably, the roughness parameters are chosen to reflect the technological characteristics of the real surfaces. Our findings reveal that surface texture plays a significant role in thermal conductivity, particularly in the realm of ballistic heat transfer within nanowires. This study provides practical recommendations for developing new thermal management materials.
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Received: 07 October 2023
Published: 02 January 2024
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| PACS: |
65.40.-b
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(Thermal properties of crystalline solids)
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63.22.-m
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(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
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63.20.D-
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(Phonon states and bands, normal modes, and phonon dispersion)
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63.20.K-
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(Phonon interactions)
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