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Color tuning of photonic gel films by UV irradiation
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Paper Abstract

Block copolymers have drawn increasing attention for fabricating functional nanomaterials due to their properties of self-assembly. In particular, photonic crystals hold promise for multiple optical applications. We prepared 1D photonic crystals with polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP) lamellar films which is hydrophobic block-hydrophilic polyelectrolyte block polymer of 57 kg /mol-b-57 kg/mol. The lamellar stacks, which are alternating layers of hydrophilic and hydrophobic moiety of PS-b-P2VP, are obtained by exposing the spin coated film under chloroform vapor. The band gaps of the lamellar films interestingly varied after immersion into the quaternizing solvents containing 5wt% of iodomethane solubilized in n-hexane. We demonstrate about the influence of UV light on those photonic gel films. To study of different properties of films, UV-visible absorption spectra were measured as a different UV irradiation time at swollen films with distilled water. The UV-visible maximum absorption spectra shifted by UV irradiation time. Dependent on the time of UV irradiations, we can change the photonic band gap.

Paper Details

Date Published: 1 March 2010
PDF: 8 pages
Proc. SPIE 7599, Organic Photonic Materials and Devices XII, 75991K (1 March 2010); doi: 10.1117/12.841649
Show Author Affiliations
Sung Eui Shin, Hongik Univ. (Korea, Republic of)
Su Young Kim, Hongik Univ. (Korea, Republic of)
Dong Myung Shin, Hongik Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7599:
Organic Photonic Materials and Devices XII
Robert L. Nelson; François Kajzar; Toshikuni Kaino, Editor(s)

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