Extensional vibration and size-dependent mechanical properties of single-crystal gold nanorods
Y Gan and Z Sun and Z Chen, JOURNAL OF APPLIED PHYSICS, 118, 164304 (2015).
The vibrational responses of single-crystal gold nanorods with different sizes and aspect ratios caused by femtosecond laser heating have been simulated, using a numerical method that integrates the two-temperature model into molecular dynamics. The fundamental extensional periods of nanorods are derived by analyzing the simulated responses of nanorods and then used to determine the elastic modulus of nanorods with the finite element calculations. It is shown that the modulus of nanorods increases and approaches the value of bulk gold with the increasing nanorod width. The dispersion curves for the fundamental extensional mode of nanorods as obtained by the analytical solutions and the finite element analysis are compared, confirming that the extensional periods of nanorods with an aspect ratio as small as similar to 2.4 are fairly well described by the theory based on the long-wavelength limit. (C) 2015 AIP Publishing LLC.
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