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Acoustic modes in metallic nanoparticles: Atomistic versus elasticity modeling

机译:金属纳米粒子中的声学模式:原子与弹性建模

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摘要

The validity of the linear elasticity theory is examined at the nanometer scale by investigating the vibrational properties of silver and gold nanoparticles whose diameters range from about 1.5-4 nm. Comparing the vibration modes calculated by elasticity theory and atomistic simulation based on the embedded-atom method, we first show that the anisotropy of the stiffness tensor in elastic calculation is essential to ensure a good agreement between elastic and atomistic models. Second, we illustrate the reduction in the number of vibration modes due to the diminution of the number of atoms when reducing the nanoparticles size. Finally, we exhibit a breakdown of the frequency-spectra scaling of the vibration modes and attribute it to surface effects. Some critical sizes under which such effects are expected, depending on the material and the considered vibration modes, are given.
机译:通过研究直径在约1.5-4 nm之间的银和金纳米颗粒的振动特性,可以在纳米尺度上检验线性弹性理论的有效性。通过弹性理论和基于嵌入式原子方法的原子模拟的振动模式的比较,我们首先表明,在弹性计算中刚度张量的各向异性对于确保弹性和原子模型之间的良好一致性至关重要。其次,我们说明了当减小纳米粒子尺寸时,由于原子数​​的减少而导致的振动模式数量的减少。最后,我们展示了振动模式的频谱比例分解,并将其归因于表面效应。根据材料和所考虑的振动模式,给出了预期会受到这种影响的一些关键尺寸。

著录项

  • 来源
    《Physical review》 |2009年第3期|035411.1-035411.7|共7页
  • 作者

    Nicolas Combe; Lucien Saviot;

  • 作者单位

    CNRS CEMES (Centre d'Elaboration des Materiaux et d'Etudes Structurales) BP 94347, 29 Rue J. Marvig, F-31055 Toulouse, France and Universite de Toulouse, UPS, F-31055 Toulouse, France;

    Institut Carnot de Bourgogne, UMR 5209 CNRS - Universite de Bourgogne, 9 Avenue A. Savary, BP 47870, F-21078 Dijon Cedex, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metals; semimetals; and alloys;

    机译:金属;半金属和合金;

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