Phonon dispersion and nanomechanical properties of periodic 1D multilayer polymer films. Academic Article

abstract

• We report on the first systematic study of phonon propagation in nanostructured composite polymer multilayer films as a function of periodicity and composition using Brillouin light scattering and numerical simulations. The high sensitivity of phonon dispersion to structure and composition allows the probing of the mechanical properties down to the single-layer level. We observe a strikingly different dependence of the longitudinal and shear moduli on confinement effects in the polymer nanolayers. In addition, temperature dependent measurements of sound velocities reveal the presence of distinct glass transition temperatures, indicative of phonon localization in films with large layer thicknesses in agreement with theoretical predictions.

authors

• Thomas, Edwin

published proceedings

• Nano Lett

author list (cited authors)

• Cheng, W., Gomopoulos, N., Fytas, G., Gorishnyy, T., Walish, J., Thomas, E. L., Hiltner, A., & Baer, E.

citation count

• 44

complete list of authors

• Cheng, W||Gomopoulos, N||Fytas, G||Gorishnyy, T||Walish, J||Thomas, EL||Hiltner, A||Baer, E

publication date

• May 2008

publisher

• American Chemical Society (ACS)  Publisher

published in

• Nano Letters: a journal dedicated to nanoscience and nanotechnology  Journal

keywords

• Computer Simulation
• Elasticity
• Hardness
• Materials Testing
• Membranes, Artificial
• Models, Chemical
• Nanostructures
• Nanotechnology
• Particle Size
• Polymers
• Stress, Mechanical
• Vibration

PubMed Central ID

• 18363344

Digital Object Identifier (DOI)

• 10.1021/nl080310w

start page

• 1423

end page

• 1428

volume

• 8

issue

• 5

URL

• http://dx.doi.org/10.1021/nl080310w