Generalized fabrication of monolayer nonclose-packed colloidal crystals with tunable lattice spacing.
Generalized fabrication of monolayer nonclose-packed colloidal crystals with tunable lattice spacing.
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DOI：
10.1021/la4011554
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
Hongta Yang;Numan Gozubenli;Yin Fang;P. Jiang
中科院分区：
文献类型：
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作者：
Hongta Yang;Numan Gozubenli;Yin Fang;P. Jiang
在这里，我们报告了一种简单的胶体转移技术，该技术能够在各种各样的衬底上可扩展地制造单层非紧密堆积的二氧化硅胶体晶体。利用自旋镀膜技术，首次在硅片上组装了具有非密排结构的二维胶体晶体。在自旋涂覆的胶体晶体上浇铸一层聚乙烯醇（PVA）薄膜，用于将非紧密堆积的颗粒阵列转移到各种衬底上。通过对pva -二氧化硅球复合膜进行不同时间的热处理，可以很容易地调节转移的单层胶体晶体的晶格间距。我们还演示了使用转移单层非密实胶体晶体作为结构模板的金纳米点周期性阵列的模板制作。所得等离子体阵列对吸附的苯硫醇分子表现出高表面增强拉曼散射增强因子（~3.8 × 10(7)）。
Here, we report a simple colloidal transfer technology that enables scalable fabrication of monolayer nonclose-packed silica colloidal crystals on a large variety of substrates. Two-dimensional colloidal crystals with an unusual nonclose-packed structure are first assembled on silicon wafers by a spin-coating technique. A poly(vinyl alcohol) (PVA) film cast upon the spin-coated colloidal crystal is used to transfer the nonclose-packed particle arrays onto various substrates. The lattice spacing of the transferred monolayer colloidal crystal can easily be adjusted by thermally treating the PVA-silica spheres composite film for varied durations. We also have demonstrated the templating fabrication of periodic arrays of gold nanodots using a transferred monolayer nonclose-packed colloidal crystal as a structural template. The resultant plasmonic array exhibits high surface-enhanced Raman scattering enhancement factor (~3.8 × 10(7)) for adsorbed benzenethiol molecules.