Ordered Nanostructure of PS-b-PEO Copolymer by Solvent Annealing with Mixture of Benzene/Water Vapor and Its Micropattern Fabrication
Ordered Nanostructure of PS-b-PEO Copolymer by Solvent Annealing with Mixture of Benzene/Water Vapor and Its Micropattern Fabrication
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DOI：
10.1166/jnn.2010.2958
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发表时间：
2010-10-01
影响因子：
--
通讯作者：
Park, Cheolmin
中科院分区：
文献类型：
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作者：
Kim, Tae Hee;Hwang, Jiyoung;Park, Cheolmin
研究了水/苯共溶剂蒸气对硅衬底上的聚苯乙烯-b-环氧乙烷共聚物（PS-b-PEO）薄膜在溶剂退火过程中有序化的影响。苯蒸气暴露后，观察到平面内的圆柱形FED微畴。水蒸气的加入主要产生垂直于衬底排列的圆柱形FED畴。在水分数约为0.05时获得圆柱体的最佳排序。随着蒸汽混合物中水的含量的增加，有序度降低，而六角填充FED圆柱体的周期性增加。六方填充的圆柱形PEO微区的平均中心到中心距离随着水分数从约25 nm增加到40 nm。作为利用溶剂退火过程中不可避免的薄膜去湿的一种方法，通过微接触印刷制备的PS-b-FED微图案用共溶剂蒸气处理，这使得我们能够制造由微图案引导的受控去湿结构。在微图案化的PS-b-FED薄膜中，PEO微区在溶剂退火后也发生了从微球到微球的相变。
We investigate the effect of water/benzene co-solvent vapor on the ordering of poly(styrene-b-ethylene oxide) (PS-b-PEO) copolymer thin film on silicon substrate upon solvent annealing. In-plane cylindrical FED microdomains were observed after exposure of benzene vapor. The addition of water vapor dominantly produced the cylindrical FED domains aligned perpendicular to the substrate. The best ordering of the cylinders was obtained at the water fraction of approximately 0.05. The degree of ordering decreases while the periodicity of haxagonally packed FED cylinders increases with the amount of water in the vapor mixture. The average center-to-center distance of hexagonally packed cylindrical PEO microdomains increases with the water fraction from approximately 25 nm to 40 nm. As one way of utilizing the dewetting of thin films inevitable during solvent annealing, PS-b-FED micropatterns prepared by microcontact printing were treated with co-solvent vapor, which allows us to fabricate the controlled dewet structures guided by the micropatterns. Cylinder-to-sphere phase transition of PEO microdomains also occurred upon solvent annealing in the micropatterned PS-b-FED films.