Synthetic opals based on silica-coated gold nanoparticles

被引:85
作者
García-Santamaría, F
Salgueiriño-Maceira, V
López, C
Liz-Marzán, LM [1 ]
机构
[1] Univ Vigo, Dept Quim Fis, E-36200 Vigo, Spain
[2] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain
关键词
D O I
10.1021/la025594t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
High-quality solid colloidal crystalline assemblies have been prepared through the sedimentation of monodisperse silica spheres, each containing a single gold nanoparticle in its center. The metal centers provide a strong absorption at a well-defined wavelength that complements the Bragg reflection arising from the periodic structure of the opal. The optical properties of these systems were characterized through transmission and specular reflectance measurements. It is clearly shown that,absorption and diffraction are basically independent of each other and their relative influence can be separated through infiltration with liquids of varying refractive index.
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页码:4519 / 4522
页数:4
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