Formation of Periodically Ordered Zinc Oxide Nanopillars in Aqueous Solution: An Approach to Photonic Crystals at Visible Wavelengths



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ZnO nanopillar arrays with high aspect ratios, such as the one shown in the figure, are fabricated from aqueous solutions at low temperatures using a polymer mold. The shape and dimensions of the nanopillars can be tuned by appropriately patterning the polymer mold. A hexagonal ZnO nanopillar array shows photonic bandgaps at visible wavelengths, as predicted by photonic band structure calculations.