Shin Sung-Eui, Kim Su-Young, Shin Dong-Myung
Department of Chemical Engineering, Hong-ik University, Seoul 121-791, Korea.
J Nanosci Nanotechnol. 2011 May;11(5):4275-8. doi: 10.1166/jnn.2011.3657.
Photonic crystals with tunability in the visible or near-infrared region have drawn increasing attention for controlling and processing light for the active components of future display. We prepared 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 is alternating layer 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 5 wt% of iodomethane, iodoethane, 1-iodobutane, 1-iodopentane, 1-iodohexane and 1-iodooctane solubilized in n-hexane. The iodoalkanes reacted with pyridine groups in PS-b-P2VP and generated the alkyl pyridinium salts readily. The degree of quaternization, alkyl chain length of iodoalkane and the salt water concentration affects the spacing of layer structure of PS-b-P2VP. The iodomethane and iodohexane produced similar band gaps and salt concentration dependence. These results are very much dependent on the hydrophobic-hydrophilic characters of PS-b-P2VP lamellar surface.
在可见光或近红外区域具有可调谐性的光子晶体，在控制和处理光以用于未来显示器的有源组件方面受到了越来越多的关注。我们制备了聚苯乙烯 - b - 聚（2 - 乙烯基吡啶）（PS - b - P2VP）层状薄膜，它是一种57 kg/mol - b - 57 kg/mol的疏水嵌段 - 亲水性聚电解质嵌段聚合物。PS - b - P2VP的层状堆叠结构是由亲水和疏水部分交替排列组成的，通过将旋涂薄膜暴露在氯仿蒸汽中获得。有趣的是，将层状薄膜浸入溶解在正己烷中的含有5 wt%碘甲烷、碘乙烷、1 - 碘丁烷、1 - 碘戊烷、1 - 碘己烷和1 - 碘辛烷的季铵化溶剂中后，其带隙发生了变化。碘代烷与PS - b - P2VP中的吡啶基团反应，很容易生成烷基吡啶鎓盐。季铵化程度、碘代烷的烷基链长度和盐水浓度会影响PS - b - P2VP层状结构的层间距。碘甲烷和碘己烷产生了相似的心带隙和盐浓度依赖性。这些结果很大程度上取决于PS - b - P2VP层状表面的疏水 - 亲水特性。
