Large-scale assembly of colloidal nanoparticles and fabrication of periodic subwavelength structures |
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Authors: | Min Wei-Lun Jiang Peng Jiang Bin |
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Affiliation: | Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA. |
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Abstract: | This paper reports a simple and scalable spin-coating technique for assembling 70?nm silica nanoparticles into non-close-packed colloidal crystals over a large area. The thickness of the shear-aligned colloidal crystals can be controlled from hundreds of layers to a single monolayer by adjusting the spin-coating conditions. We further demonstrate that the spin-coated colloidal monolayers can be used as structural templates to pattern sub-100?nm pillar arrays directly on silicon substrates. The resulting subwavelength-structured pillar arrays exhibit excellent broadband antireflective and superhydrophobic properties, which are promising for developing self-cleaning antireflection coatings for crystalline silicon solar cells. This bottom-up approach enables large-scale production of periodic nanostructures with resolution beyond the optical diffraction limit that have important technological applications ranging from high-density data storage and optoelectronics to biological sensing and subwavelength optics. |
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