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Journal of Nanomaterials
Volume 2012, Article ID 342329, 5 pages
http://dx.doi.org/10.1155/2012/342329
Research Article

Study on Vibration Behavior of Doubly Clamped Silicon Nanowires by Molecular Dynamics

Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing 210096, China

Received 25 February 2012; Revised 1 April 2012; Accepted 19 April 2012

Academic Editor: Sergio J. Mejía-Rosales

Copyright © 2012 H. Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The vibration behavior of doubly clamped silicon nanowires with square cross sections is studied by molecular dynamics method. Silicon nanowires have lengths ranging from 4.888 to 12.491 nm and cross sections ranging from 1.22 nm × 1.22 nm to 3.39 nm × 3.39 nm. The size dependence of the resonant frequency is studied in detail. The results show that the vibration behavior of Si nanowire is quite different from the macroscopic beam, and the resonant frequency is much higher than the result based on the continuum theory, but close to the theoretical result based on the semicontinuum approach. Surface reconstruction can strongly affect on vibration behavior. These results demonstrate that the classic theory may not be suitable for analysis of performances of nanostructures, and the conclusion of the study has a certain practical significance on related fields.