中国物理B ›› 2007, Vol. 16 ›› Issue (12): 3777-3782.doi: 10.1088/1009-1963/16/12/037

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Thermal conductivity of dielectric nanowires with different cross-section shapes

顾骁坤, 曹炳阳   

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • 出版日期:2007-12-20 发布日期:2007-12-20
  • 基金资助:
    Project supported by the National Natural Foundation of China (Grant No~50606018) and by SRT Foundation of Tsinghua University (Grant No~061T0249).

Thermal conductivity of dielectric nanowires with different cross-section shapes

Gu Xiao-Kun(顾骁坤) and Cao Bing-Yang(曹炳阳)†   

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • Online:2007-12-20 Published:2007-12-20
  • Supported by:
    Project supported by the National Natural Foundation of China (Grant No~50606018) and by SRT Foundation of Tsinghua University (Grant No~061T0249).

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摘要： Non-equilibrium molecular dynamics simulations have been performed to investigate the effect of the cross-section shape on the thermal conductivity of argon nanowires. Some typical cross-section shapes, such as triangle, square, pentagon, hexagon and circle, are carefully explored. The simulation results show that with the same cross-sectional area of the regular polygons, the thermal conductivities decrease with the reduction of the sides of the polygons, and the thermal conductivity of the circular nanowire is larger than those of the other polygonal ones. Phonon gas kinetic theory is used to analyse the phonon transport in nanowires, and the concept of equivalent diameter is proposed to illustrate the characteristic dimension of the none-circular cross-section.

Abstract: Non-equilibrium molecular dynamics simulations have been performed to investigate the effect of the cross-section shape on the thermal conductivity of argon nanowires. Some typical cross-section shapes, such as triangle, square, pentagon, hexagon and circle, are carefully explored. The simulation results show that with the same cross-sectional area of the regular polygons, the thermal conductivities decrease with the reduction of the sides of the polygons, and the thermal conductivity of the circular nanowire is larger than those of the other polygonal ones. Phonon gas kinetic theory is used to analyse the phonon transport in nanowires, and the concept of equivalent diameter is proposed to illustrate the characteristic dimension of the none-circular cross-section.

Key words: thermal conductivity, nanowire, phonon kinetic theory, molecular dynamics

中图分类号: 

  • 65.80.+n
61.46.-w (Structure of nanoscale materials) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 66.70.-f (Nonelectronic thermal conduction and heat-pulse propagation in solids;thermal waves) 77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)