Hierarchically-responded assembly of block copolymer thin films with stimuli of varied solvent selectivity

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题名:	Hierarchically-responded assembly of block copolymer thin films with stimuli of varied solvent selectivity
作者:	孫亞賢;Lee, Yu-Chi;Sun, Ya-Sen;Liou, Jiun-You;Chuang, Wei-Tsung
贡献者:	工學院化學工程與材料工程學系
关键词:	acetone;Annealing;Applied sciences;chloroform;Copolymer thin films;Droplets;Exact sciences and technology;Hierarchical self-assembly;Microstructure;nanomaterials;Nanostructure;Organic polymers;Physicochemistry of polymers;polymers;Properties and characterization;Selectivity;silicon;Solvent annealing;Solvents;Stacks;Structure, morphology and analysis;Terraced;Terraces;Thin films;vapors
日期:	2012-11-30
上传时间:	2026-04-21 14:03:13 (UTC+8)
出版者:	Elsevier BV;Kidlington: Elsevier Ltd
摘要:	摘要： Through a combination of micro-contact imprinting and block copolymer self assembly, a highly dewetting process of a symmetric diblock copolymer occurs, leading to hierarchical development of microstructures (microdroplets or microterraces) and nanodomains. The process is driven by the macroscopically hexagonal-ordered circular geometry of the PS-grafted pattern on silicon substrates and by solvent annealing in solvent vapors of varied selectivity. We investigate how relief P(S-b-4VP) microstructures adjust their internal nanostructures and microscopic shape on a patterned substrate in response to solvent vapors of varied selectivity. Whereas solvent annealing in THF vapor causes formation of nanosphere-comprised droplets with a hemispherical cap, solvent annealing in chloroform and acetone vapors leads to the development of terraced stacks of parallel-oriented lamellae. Each lamellar layer within the terraced stacks has the thickness of an entire PS-P4VP/P4VP-PS layer. In contrast, three types of relief microstructures, nanosphere-comprised terraces, nanocylinder-comprised droplets and nanolamella-comprised terraces, are found in a dynamic process under DMF vapor. For DMF-annealed terraces, the stacks comprise PS-P4VP lamellar layers and thus the thickness of each PS-P4VP lamellar layer is effectively quantized by a half thickness of one PS-P4VP/P4VP-PS layer. The variances in nanoscale and microscale structures are due to the adaption of stimuli-responsive polymer materials to surrounding environments under the confinement of the patterned substrate. [Display omitted] 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-11-30 出處： Polymer (Guilford), 2012-11, Vol.53 (25), p.5972-5981 版權： 2012 Elsevier Ltd 版權： 2014 INIST-CNRS 識別號： ISSN: 0032-3861 識別號： EISSN: 1873-2291 識別號： DOI: 10.1016/j.polymer.2012.10.031 識別號： CODEN: POLMAG
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