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Abstract
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In this work, a monolayer of poly(methyl methacrylate) (PMMA) microspheres were synthesized using the air-liquid interface deposition method on a glass substrate. Several parameters affect the quality of these 2D colloidal crystals such as the solution concentration, injection rate, the diameter of polymeric spheres, etc. The spheres were arranged in a hexagonal lattice in a close-packed way. Different analysis methods such as UV-Vis spectroscopy, scanning electron microscopy and optical diffraction pattern confirm the formation of close-packed 2D colloidal crystals. Also, using the FDTD method, these structures are simulated and the results well match the experimental ones. The schematic of the simulation and also the SEM image of the structure are shown in Fig.1.
2D colloidal crystals [1] can be used as versatile templates in the colloidal lithography method which is a cheap and easy technique to fabricate various nanostructure arrays. Also, its unique optical properties make it a good candidate for designing optical chemical/biosensors [2].
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