Probing relief terraces in destabilized thin films of an asymmetric block copolymer with grazing-incidence small-angle X-ray scattering

Ya Sen Sun, Shih Wei Chien, Jiun You Liou

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

X-ray scattering in a grazing-incidence geometry (GISAXS) was used to study relief microstructures in thin films of asymmetric polystyrene-block- poly(methyl methacrylate) P(S-b-MMA) that dewetted on SiOx/Si and PMMA-SiOx/Si after isothermal annealing at 210 °C for 12 h. The micro-and nanostructures of a P(S-b-MMA) film deposited on PS-SiOx/Si were studied for comparison. The diffuse scattering streaks observed at angles with respect to the film normal direction in the GISAXS patterns correlate with the formation of relief terraces comprising parallel PMMA cylinders packed within a PS matrix. The relief terraces reveal a facet-like wedge at the edge, resulting from partial wetting of the nonanchored P(S-b-MMA) top layer at contact angles in the range 4-6.5° on a monolayer of autophobic P(S-b-MMA) brushes anchored onto SiOx/Si and PMMA-SiOx/Si.

Original languageEnglish
Pages (from-to)7250-7260
Number of pages11
JournalMacromolecules
Volume43
Issue number17
DOIs
StatePublished - 14 Sep 2010

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