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Theoretical Chemistry Accounts

, 131:1078 | Cite as

Nanoparticle morphology and aspect ratio effects in Ag/PVDF nanocomposites

  • Christopher K. Rowan
  • Irina PaciEmail author
Regular Article
Part of the following topical collections:
  1. 50th Anniversary Collection

Abstract

Optical response in silver/polyvinylidene fluoride nanocomposite materials with nonspherical inclusions was examined using direct dipolar interband transitions, from density functional theory. We discuss here the dependence of the optical response of the material on the geometry, crystallographic makeup and end-cap morphology of the metallic inclusions, as well as on their orientation relative to the polarization direction of the applied electromagnetic field. Each periodic unit cell contained a single inclusion and a polymer matrix; thus, the composite behaved as a monodisperse, perfectly oriented material. Overall, the spectral location of the composite excitation spectrum was tied to that of the metallic inclusions and correlated well to quantum confinement models for the direction of polarization: As linear size of the inclusion increased in a given direction, the excitation spectrum of light polarized in that direction was red-shifted. The effect of the polymer matrix was also examined. Coulomb repulsion from matrix energy states led to splitting of nanoparticle-based energy levels, and the matrix conduction band became involved in high-energy transitions. These effects led to extensions of the spectra of nanocomposites with less stable {100}–basal plane inclusions to very low excitation energies. Attenuation or redshifting of nanoparticle peaks with high photon energies was also observed for materials with small linear sizes along the excitation direction. Comparisons with experimental and time-dependent density functional theory results suggest that estimating the complex dielectric constant from interband transition dipole moments, in a time-independent fashion, provides reliable qualitative spectra for these systems.

Keywords

Metal/polymer nanocomposites Optical response Density functional theory  Inclusion morphology Birefrigent materials 

Notes

Acknowledgments

Funding was provided by the National Science and Engineering Research Council of Canada, the Canada Foundation for Innovation, the British Columbia Knowledge Development Fund and the University of Victoria. This research was performed in part using the WestGrid computing resources, which are funded in part by the Canada Foundation for Innovation, Alberta Innovation and Science, BC Advanced Education and the participating research institutions.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of VictoriaVictoriaCanada

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