Micropatterns of Non-Circular Droplets of Nanostructured PS-b-PEO Copolymer by Solvent-Assisted Wetting on a Chemically Periodic Surface
✍ Scribed by Tae Hee Kim; Youn Jung Park; Giyoung Song; Dong Ha Kim; June Huh; Olaf Karthaus; Cheolmin Park
- Publisher
- John Wiley and Sons
- Year
- 2012
- Tongue
- English
- Weight
- 952 KB
- Volume
- 213
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
A method to fabricate micropatterns of non‐circular droplets of a self‐assembled block copolymer by solvent‐assisted wetting on chemically periodic surface is presented. The block copolymer is dewetted on a topographic pre‐pattern to form an array of microdroplets with a sphere‐capped shape and circular contact line. The droplets are then transferred onto a chemically periodic Au line pattern microcontact‐printed with two types of self‐assembled monolayers (SAMs). Solvent vapor application provides sufficient mobility to the block copolymer molecules to induce spreading of the transferred droplets, resulting in two types of non‐circular microdroplet growth. The growth behavior depends on the size of initial droplets relative to periodic line width and on the initial registries of as‐transferred droplets.