Wide frequency phonons manipulation in Si nanowire by introducing nanopillars and nanoparticles  

作　　者：李亚涛 刘英光 李鑫 李亨宣 王志香 张久意 Yatao Li;Yingguang Liu;Xin Li;Hengxuan Li;Zhixiang Wang;Jiuyi Zhang(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,China)

机构地区：[1]Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,China

出　　处：《Chinese Physics B》2024年第4期78-84,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.52076080);the Natural Science Foundation of Hebei Province of China (Grant No.E2020502011)。

摘　　要：The combination of different nanostructures can hinder phonons transmission in a wide frequency range and further reduce the thermal conductivity(TC).This will benefit the improvement and application of thermoelectric conversion,insulating materials and thermal barrier coatings,etc.In this work,the effects of nanopillars and Ge nanoparticles(GNPs)on the thermal transport of Si nanowire(SN)are investigated by nonequilibrium molecular dynamics(NEMD)simulation.By analyzing phonons transport behaviors,it is confirmed that the introduction of nanopillars leads to the occurrence of lowfrequency phonons resonance,and nanoparticles enhance high-frequency phonons interface scattering and localization.The results show that phonons transport in the whole frequency range can be strongly hindered by the simultaneous introduction of nanopillars and nanoparticles.In addition,the effects of system length,temperature,sizes and numbers of nanoparticles on the TC are investigated.Our work provides useful insights into the effective regulation of the TC of nanomaterials.

关 键 词：resonant structure NANOPARTICLES NANOPILLARS phonon transport thermal conductivity 

分 类 号：TB383.1[一般工业技术—材料科学与工程]