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Optical properties of a metalo-dielectric nanocomposite: Small gold spherical nanoparticles in a cylindrical di-block copolymer

Askari, A. A ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1140/epjb/e2013-31055-y
  3. Publisher: 2013
  4. Abstract:
  5. In this paper, the well-known effective medium approximation (EMA) and coupled dipole approximation (CDA) methods are employed to study the optical properties of a metal nanoparticle-block copolymer (MNP-BCP) nanocomposite. This approach is applied to study a system consisting of small gold spherical nanoparticles randomly distributed in the cylindrical micelles of a di-BCP. At first, the EMA method is used to obtain the effective dielectric function of a semi-metallic cylinder. Then, the extinction spectrum of the hexagonal 2D-array of semi-metallic cylinders is obtained by the CDA method. This procedure makes it possible to study simultaneously both the electromagnetic extinction of MNPs and incident light scattering from the 2D-array of polymeric cylinders. This work investigates the effect of different parameters such as filling fraction of MNPs, inter-cylinder distances, polarization and direction of the incident light and the difference between the refractive indices of the BCP blocks on the optical properties of the MNP-BCP nanocomposite system
  6. Keywords:
  7. Spherical nanoparticles ; Coupled dipole approximations ; Di-block copolymers ; Dielectric functions ; Effective-medium approximation ; Nanocomposite systems ; Randomly distributed ; Cylindrical micelles ; Block copolymers ; Cylinders (shapes) ; Gold ; Metallography ; Nanoparticles ; Refractive index ; Nanocomposites
  8. Source: European Physical Journal B ; Volume 86, Issue 4 , 2013 ; 14346028 (ISSN)
  9. URL: http://link.springer.com/article/10.1140%2Fepjb%2Fe2013-31055-y