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Development of Nanodomain and Fractal Morphologies in Solvent Annealed Block Copolymer Thin Films

โœ Scribed by Juan Peng; Yanchun Han; Wolfgang Knoll; Dong Ha Kim

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
381 KB
Volume
28
Category
Article
ISSN
1022-1336

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โœฆ Synopsis

Abstract

We have systematically studied the thin film morphologies of asymmetric polystyreneโ€blockโ€poly(ethylene oxide) (PSโ€bโ€PEO) diblock copolymer subjected to solvent vapors of varying selectivity for the constituent blocks. Upon a short treatment in neutral or PSโ€selective vapor, the film exhibited a highly ordered array of hexagonally packed, cylindrical microdomains. In the case of PEO selective vapor annealing, such ordered cylindrical microdomains were not obtained. Instead, fractal patterns on the microscale were observed and their growth processes investigated. Furthermore, hierarchical structures could be obtained if the fractal pattern was exposed to neutral or PS selective vapor.

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