Determination of Thermal Properties of Unsmooth Si Nanowires  

作　　者：刘世贤 Alexander A.Barinov 訚菲 Vladimir I.Khvesyuk Shixian Liu;Alexander A.Barinov;Fei Yin;Vladimir I.Khvesyuk(Department of Thermophysics,Bauman Moscow State Technical University,Moscow 105005,Russian Federation)

机构地区：[1]Department of Thermophysics,Bauman Moscow State Technical University,Moscow 105005,Russian Federation

出　　处：《Chinese Physics Letters》2024年第1期51-56,共6页中国物理快报（英文版）

基　　金：financial support from the China Scholarship Council.

摘　　要：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 115nm 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.

关 键 词：NANOWIRES ROUGHNESS SIZE 

分 类 号：TK124[动力工程及工程热物理—工程热物理]