Journal
ACS NANO
Volume 6, Issue 10, Pages 8933-8939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302949n
Keywords
block copolymer lamellar gels; dynamic swelling; ion exchange; tunable color; photonic band gap
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Funding
- U.S. Army Research Office [W911NF-07-D-0004]
- U.S. Air Force, United States [AOARO 114095]
- Korea Research Foundation
- Korean Government, Korea [KRF-2008-357-D00069]
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One-dimensionally periodic block copolymer photonic lamellar gels with full-color tunability as a result of a direct exchange of counteranions were fabricated via a two-step procedure comprising the self-assembly of a hydrophobic block hydrophilic polyelectrolyte block copolymer, polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP), followed by sequential quaternization of the P2VP layers in 1-bromoethane solution. Depending on the hydration characteristics of each counteranion, the selective swelling of the block copolymer lamellar structures leads to large tunability of the photonic stop band from blue to red wavelengths. More extensive quaternization of the P2VP block allows the photonic lamellar gels to swell more and red shift to longer wavelength. Here, we investigate the dynamic swelling behavior in the photonic gel films through time-resolved in situ measurement of UV-vis transmission. We model the swelling behavior using the transfer matrix method based on the experimentally observed reflectivity data with substitution of appropriate counterions. These tunable structural color materials may be attractive for numerous applications such as high-contrast displays without using a backlight, color filters, and optical mirrors for flexible lasing.
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