Tailoring the Refractive Indices of Thin Film Polymer Metallic Nanoparticle Nanocomposites

被引:33
|
作者
Kim, Jenny [1 ]
Yang, Hengxi [2 ]
Green, Peter F. [1 ,3 ]
机构
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA
关键词
SURFACE-PLASMON RESONANCE; GOLD NANOPARTICLES; DISPERSION; SCATTERING;
D O I
10.1021/la300374w
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We demonstrate how to tailor the spatial distribution of gold nanoparticles (Au-NPs) of different sizes within polystyrene (PS) thin, supported, film hosts, thereby enabling the connection between the spatial distribution of Au-NPs within the polymer film and the optical properties to be determined. The real, n, and imaginary parts, k, of the complex refractive indices N = n(lambda)+ik(lambda) of the nanocomposite films were measured as a function of wavelength, lambda, using multivariable angle spectroscopic ellipsometry. The surface plasmon response of films containing nearly homogeneous Au-NP distributions were well described by predictions based on classical Mie theory and the Drude model. The optical spectra of samples containing inhomogeneous nanoparticle distributions manifest features associated with differences in the size and interparticle spacings as well as the proximity and organization of nanoparticles at the substrate and free surface.
引用
收藏
页码:9735 / 9741
页数:7
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