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標題: Generalized Fabrication of Monolayer Nonclose-Packed ColloidalCrystals with Tunable Lattice Spacing
Project: Langmuir, Volume29, Issue 25, Page(s) 7674-7681.
Here, we report a simple colloidal transfertechnology that enables scalable fabrication of monolayernonclose-packed silica colloidal crystals on a large variety ofsubstrates. Two-dimensional colloidal crystals with an unusualnonclose-packed structure are first assembled on silicon wafers bya spin-coating technique. A poly(vinyl alcohol) (PVA) film castupon the spin-coated colloidal crystal is used to transfer thenonclose-packed particle arrays onto various substrates. Thelattice spacing of the transferred monolayer colloidal crystal caneasily be adjusted by thermally treating the PVA-silica spherescomposite film for varied durations. We also have demonstratedthe templating fabrication of periodic arrays of gold nanodotsusing a transferred monolayer nonclose-packed colloidal crystal as a structural template. The resultant plasmonic array exhibitshigh surface-enhanced Raman scattering enhancement factor (∼3.8 × 107) for adsorbed benzenethiol molecules.
DOI: 10.1021/la4011554
Appears in Collections:化學工程學系所

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