中国物理B ›› 2024, Vol. 33 ›› Issue (4): 46502-046502.doi: 10.1088/1674-1056/ad0290

所属专题: SPECIAL TOPIC — Heat conduction and its related interdisciplinary areas

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

Yatao Li(李亚涛), Yingguang Liu(刘英光), Xin Li(李鑫), Hengxuan Li(李亨宣), Zhixiang Wang(王志香), and Jiuyi Zhang(张久意)   

  1. Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding 071003, China
  • 收稿日期:2023-08-07 修回日期:2023-09-20 接受日期:2023-10-12 出版日期:2024-03-19 发布日期:2024-03-27
  • 通讯作者: Yingguang Liu E-mail:yingguang266@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52076080) and the Natural Science Foundation of Hebei Province of China (Grant No. E2020502011).

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

Yatao Li(李亚涛), Yingguang Liu(刘英光), Xin Li(李鑫), Hengxuan Li(李亨宣), Zhixiang Wang(王志香), and Jiuyi Zhang(张久意)   

  1. Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding 071003, China
  • Received:2023-08-07 Revised:2023-09-20 Accepted:2023-10-12 Online:2024-03-19 Published:2024-03-27
  • Contact: Yingguang Liu E-mail:yingguang266@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52076080) and 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 low-frequency 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

Abstract: 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 low-frequency 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.

Key words: resonant structure, nanoparticles, nanopillars, phonon transport, thermal conductivity

中图分类号:  (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)

  • 65.80.-g
63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 44.10.+i (Heat conduction) 31.15.xv (Molecular dynamics and other numerical methods)