High-density arrays of titania nanoparticles using monolayer micellar films of diblock copolymers as templates

Xue Li, King Hang Aaron Lau, Dong Ha Kim, Wolfgang Knoll

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P 2VP) as reaction scaffolds. Titania could be introduced selectively within P2VP nanodomains in PS-b-P2VP films through the binary reaction between water molecules trapped in the P2VP domains and the TiCl 4 vapor precursors. Subsequent UV exposure or oxygen plasma treatment removed the organic matrix, leading to titania nanoparticle arrays on the substrate surface. The diameter of the titania domains and the interparticle distance were defined by the lateral scale present in the microphase-separated morphology of the initial PS-b-P2VP films. The typical diameter of titania nanoparticles obtained by oxygen plasma treatment was of the order of ∼23 nm. Photoluminescence (PL) properties were investigated for films before and after plasma treatment. Both samples showed PL properties with major physical origin due to self-trapped excitons, indicating that the local environment of the titanium atoms is similar.

Original languageEnglish
Pages (from-to)5212-5217
Number of pages6
JournalLangmuir
Volume21
Issue number11
DOIs
StatePublished - 24 May 2005

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