Holographic Composites with Gold Nanoparticles: Nanoparticles Promote Polymer Segregation
Holographic Composites with Gold Nanoparticles: Nanoparticles Promote Polymer Segregation
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DOI：
10.1021/cm8005315
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
L. Goldenberg;O. Sakhno;T. Smirnova;P. Helliwell;V. Chechik;J. Stumpe
中科院分区：
文献类型：
--
作者：
L. Goldenberg;O. Sakhno;T. Smirnova;P. Helliwell;V. Chechik;J. Stumpe
New nanocomposites containing functionalized acrylate monomers and Au nanoparticles (NPs, 1.5−3 nm core diameter, 1−2 wt %) have been developed for an all-optical fabrication of periodic bulk structures by holographic photopolymerization. The Au NPs were coated with ethyl 11-mercaptoundecanoate to ensure good solubility in low-polarity organic media. The materials with only 1.5 wt % Au NPs show unusually high amplitude of the refractive index modulation in the diffraction volume gratings (0.0073). Both volume and surface relief gratings are formed during the holographic exposure. The proposed mechanism of the refractive index contrast amplification (as compared to monomer mixture without NPs) includes interception of free radicals by Au nanoparticles. This slows down the free-radical photopolymerization, thus promoting the increase in lateral periodic redistribution of the components in the interference pattern. The redistribution of both NP and monomers provides high efficient grating formation with the ...
