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Large-scale assembly of colloidal nanoparticles and fabrication of periodic subwavelength structures.

Author information

Affiliations

  • 1. Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA.
      Authors
    • Min WL 1
    (1 author)

Nanotechnology, 30 Oct 2008, 19(47):475604
https://doi.org/10.1088/0957-4484/19/47/475604 PMID: 21836279 

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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Read article at publisher's site: https://doi.org/10.1088/0957-4484/19/47/475604

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