Two-dimensional nonclose-packed colloidal crystals formed by spincoating
2006; American Institute of Physics; Volume: 89; Issue: 1 Linguagem: Inglês
10.1063/1.2218832
ISSN1520-8842
AutoresPeng Jiang, Tushar Prasad, Michael J. McFarland, Vicki L. Colvin,
Tópico(s)Electrowetting and Microfluidic Technologies
ResumoWe report a simple spin-coating technique for the production of monolayer nonclose-packed colloidal crystals. Dispersions of submicron silica spheres in triacrylate monomers are spincoated and polymerized to form two-dimensional colloidal crystal-polymer nanocomposites. By removing the polymer matrix, wafer-scale nonclose-packed colloidal crystals with high crystalline quality can be made. The technique is compatible with standard microfabrication and allows for the production of microstructures for potential devices. Normal-incidence reflectivity spectra in the visible and near-infrared regions show sharp peaks due to Bragg diffraction from the colloidal monolayers. The peak position matches with the theoretical prediction using scalar wave approximation.
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