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Title: Micro-brillouin study of the eigenvibrations of single isolated polymer nanospheres
Authors: Li, Y. 
Lim, H.S. 
Wang, Z.K. 
Ng, S.C. 
Kuok, M.H. 
Keywords: Eigenmodes
Mechanical properties
Polymer nanospheres
Issue Date: Nov-2008
Citation: Li, Y.,Lim, H.S.,Wang, Z.K.,Ng, S.C.,Kuok, M.H. (2008-11). Micro-brillouin study of the eigenvibrations of single isolated polymer nanospheres. Journal of Nanoscience and Nanotechnology 8 (11) : 5869-5872. ScholarBank@NUS Repository.
Abstract: The localized acoustic modes of single isolated polymethyl methacrylate (PMMA) and polystyrene nanospheres have been studied by micro-Brillouin light scattering. The measured mode frequencies are analyzed on the basis of the Lamb theory formulated for a sphere under free boundary conditions. By measuring light scattering from single isolated particles, placed atop a piece of polished silicon wafer, the free-surface conditions are almost experimentally realized. The observed spectral peaks are attributed to localized eigenvibrations whose frequencies scale as inverse sphere diameter, in accordance with Lamb's theory. The Young's moduli and Poisson ratios of the polymer spheres studied have been evaluated from fits to the experimental data. We have demonstrated that micro-Brillouin spectroscopy is a powerful technique for probing the acoustic dynamics and mechanical properties of nanostructures. Copyright © 2008 American Scientific Publishers. All rights reserved.
Source Title: Journal of Nanoscience and Nanotechnology
ISSN: 15334880
DOI: 10.1166/jnn.2008.330
Appears in Collections:Staff Publications

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