单层
制作
胶体晶体
胶体
材料科学
格子(音乐)
纳米技术
结晶学
化学物理
化学
物理
物理化学
医学
替代医学
病理
声学
作者
Hongta Yang,Numan Gözübenli,Yin Fang,Peng Jiang
出处
期刊:Langmuir
[American Chemical Society]
日期:2013-06-14
卷期号:29 (25): 7674-7681
被引量:20
摘要
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.
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