Hierarchically Organized Structures Engineered from Controlled Evaporative Self-Assembly

被引：91

作者：

Byun, Myunghwan ^{[1
]}

Bowden, Ned B. ^{[2
]}

Lin, Zhiqun ^{[1
]}

机构：

[1] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[2] Univ Iowa, Dept Chem, Iowa City, IA 52242 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 08期

基金：

美国国家科学基金会;

关键词：

Evaporative self-assembly; hierarchically organized structures; block copolymers; MESOSCALE POLYMER PATTERNS; COMB BLOCK-COPOLYMERS; MOLECULAR-WEIGHT; SUBSTRATE; SPHERE;

D O I：

10.1021/nl1018035

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

By constraining an asymmetric comb block copolymer (CBCP) toluene solution to evaporate in a wedge-on-Si geometry composed of a wedge lens situated on a Si substrate, gradient concentric stripelike surface patterns of CBCP at the microscopic scale were yielded as a direct consequence of controlled evaporative self-assembly of CBCP. The formation of either straight stripes or jagged stripes was dictated by the height of the wedge. Upon subsequent solvent vapor annealing, hierarchically organized structures of CBCP were produced, resulting from the interplay of solvent vapor assisted, unfavorable interfacial interaction driven destabilization of CBCP from the Si substrate at the microscopic scale and the solvent vapor promoted reconstruction of CBCP nanodomains within the stripes at the nanometer scale. This facile approach of combining controlled evaporative self-assembly with subsequent solvent vapor annealing offers a new platform to rationally design and engineer self-assembling building blocks into functional materials and devices in a simple, cost-effective manner.

引用

页码：3111 / 3117

页数：7

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