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Issue 23, 2009
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Nanoporous polymeric photonic crystals by emulsion holography

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We report the holographic photopatterning of a microemulsion with a formamide polar phase and an acrylate monomer-containing nonpolar phase to produce polymer structures with periodic nanoscale porosity. Formamide is a highly polar solvent that forms well dispersed, nonaqueous emulsion droplets within the monomer-containing nonpolar phase before holographic patterning. Photochemically initiated polymerization of the nonpolar phase generates ordered structures defined by the holographic interference. Evaporation of the formamide from this lamellar structure yields a multilayered stack that acts as a photonic crystal (PC) with high optical reflectivity and a wide reflection bandwidth. The size of formamide droplets in the photopolymer fluid must be controlled to have a narrow distribution and peak near 60 nm to fabricate PC with high reflectivity. Addition of a sodium dioctyl sulfosuccinate (AOT) surfactant helps to stabilize the formamide microemulsion which further facilitates the formation of ordered nanopores with a uniform size.

Graphical abstract: Nanoporous polymeric photonic crystals by emulsion holography

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Publication details

The article was received on 05 Jan 2009, accepted on 31 Mar 2009, published on 07 May 2009 and first published online on 07 May 2009

Article type: Paper
DOI: 10.1039/B823247D
Citation: J. Mater. Chem., 2009,19, 3998-4003
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    Nanoporous polymeric photonic crystals by emulsion holography

    V. K. S. Hsiao, K. Yong, A. N. Cartwright, M. T. Swihart, P. N. Prasad, P. F. Lloyd and T. J. Bunning, J. Mater. Chem., 2009, 19, 3998
    DOI: 10.1039/B823247D

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