Ultra-Fast Vertical Ordering of Lamellar Block Copolymer Films on Unmodified Substrates
Ultra-Fast Vertical Ordering of Lamellar Block Copolymer Films on Unmodified Substrates
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未改性基材上层状嵌段共聚物薄膜的超快速垂直排序
DOI：
10.1021/acs.macromol.0c01782
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发表时间：
2021
期刊：
影响因子：
5.5
通讯作者：
Karim, Alamgir
中科院分区：
文献类型：
--
作者：
Singh, Maninderjeet;Wu, Wenjie;Basutkar, Monali N.;Strzalka, Joseph;Al-Enizi, Abdullah M.;Douglas, Jack F.;Karim, Alamgir
为了充分利用嵌段共聚物(BCP)薄膜的全部潜力，将其用于从离子导电膜、晶体管到纳米线阵列天线等技术设备，需要在各种未经修饰的衬底上快速自组装具有垂直取向的层状结构域的层状嵌段共聚物(L-BCP)。l-BCP具有比圆柱形聚合物更大的传输界面面积。我们的观察表明，利用基于温度梯度的冷区退火法，由选定的溶剂定向蒸发得到的聚苯乙烯嵌段聚甲基丙烯酸甲酯(PS-b-PMMA)的l-bCP薄膜(PS-b-PMMA)的铸态为其超快演化(≈30 S)成有序垂直取向纳米结构的“种子模板”。在未经改性的石英和Kapton衬底上得到了垂直的片层，CZA的l-BCP有序化动力学比各向同性的烘箱退火快得多。测试发现，Verticall-BCP的快速有序化动力学适用于不同的分子质量和薄膜厚度(从20 nm到480 nm)，最终在热处理时间的上限转变为其平衡的平行形态。这种使用卷对卷兼容CZA的l-BCP垂直取向的快速排序策略将对界面传输的基础研究以及从膜到纳米线的工业应用具有很高的相关性。
To utilize the full potential of block copolymer (BCP) thin films for use in technological devices ranging from ion conduction membranes and transistors to nanowire array antennas, rapid self-assembly of lamellar block copolymers (l-BCPs) with vertically oriented lamellar domains on a variety of unmodified substrates is needed.l-BCPs have an inherently larger interfacial area for transport compared to their cylindrical counterpart. Our observations demonstrate that the as-cast weakly ordered vertically oriented state ofl-BCP films of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) from the directional evaporation of select solvents act as “seed templates” for their ultra-fast evolution (≈30 s) into well-ordered vertically oriented nanostructures, using a thermal gradient-based cold zone annealing (CZA) technique. Vertical lamellae are obtained on unmodified substrates, Quartz and Kapton, and the kinetics ofl-BCP ordering is much faster by CZA as compared to the isotropic oven annealing. The rapid ordering kinetics of verticall-BCPs is tested and found applicable to different molecular masses and film thicknesses ranging from 20 nm to 480 nm, which ultimately flip over to their equilibrium parallel morphology at the upper limits of annealing times. This rapid ordering strategy for the vertical orientation ofl-BCPs using roll-to-roll compatible CZA would be highly relevant for fundamental studies of interfacial transport as well as for industrial applications from membranes to nanowires.
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