Reversible submergence of nanoparticles into ultrathin block copolymer films

Killugudi Swaminathan Iyer, B. Zdyrko, S. Malynych, G. Chumanov, I. Luzinov

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In this study we report on the responsive behavior of organic/inorganic nanocomposite films. Specifically, the heat treatment of the films in the vapor of different solvents resulted in reversible rising and submerging of the nanoparticles incorporated into the film. The thin nanocomposite films consisting of silver nanoparticles (100-130 nm) evenly dispersed in a poly(styrene-b-2-vinylpyridine) (PS-P2VP) block copolymer were formed via melt incorporation. To fabricate the films the nanoparticles were first attached to the P2VP domains exposed to the surface of the block copolymer film. Next, the substrates covered with nanoparticles were annealed at 130 degrees C. The thermal treatment caused incorporation of the nanoparticles into the polymeric film. Thermal annealing of the film in a vapor of solvent selective for the PS block caused the nanoparticles to rise to the surface. The annealing of the same film in a vapor of solvent selective for the P2VP block led to submerging of the nanoparticles into the polymer film. The submerging and rising behavior of the nanoparticles was completely reversible.
Original languageEnglish
Pages (from-to)2538-2542
JournalSoft Matter
Volume7
DOIs
Publication statusPublished - 2011

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