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

X. Li, K. H. A. Lau, D. H. Kim, W. Knoll

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P2VP) 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 TiCl4 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 similar to 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.
LanguageEnglish
Pages5212-5217
Number of pages6
JournalLangmuir
Volume21
Issue number11
Early online date28 Apr 2005
DOIs
Publication statusPublished - 2005

Fingerprint

Block copolymers
Monolayers
copolymers
templates
titanium
Titanium
Nanoparticles
nanoparticles
oxygen plasma
Plasmas
Photoluminescence
Oxygen
photoluminescence
Titania
Styrene
Scaffolds
polystyrene
Excitons
Vapors
excitons

Keywords

  • polystyrene-block-poly(4-vinylpyridine)
  • block-copolymers
  • thin-films
  • nanosphere
  • lithography
  • nanowire arrays
  • silicon-oxide
  • tio2 surfaces
  • nanostructures
  • polymers

Cite this

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title = "High-density arrays of titania nanoparticles using monolayer micellar films of diblock copolymers as templates",
abstract = "Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P2VP) 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 TiCl4 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 similar to 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.",
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High-density arrays of titania nanoparticles using monolayer micellar films of diblock copolymers as templates. / Li, X.; Lau, K. H. A.; Kim, D. H.; Knoll, W.

In: Langmuir, Vol. 21, No. 11, 2005, p. 5212-5217.

Research output: Contribution to journalArticle

TY - JOUR

T1 - High-density arrays of titania nanoparticles using monolayer micellar films of diblock copolymers as templates

AU - Li, X.

AU - Lau, K. H. A.

AU - Kim, D. H.

AU - Knoll, W.

N1 - M1 - 11 Times Cited: 54

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N2 - Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P2VP) 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 TiCl4 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 similar to 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.

AB - Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P2VP) 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 TiCl4 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 similar to 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.

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KW - nanowire arrays

KW - silicon-oxide

KW - tio2 surfaces

KW - nanostructures

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