Holographically defined nanoparticle placement in 3D colloidal crystals

Yoonho Jun, Dongguk Yu, Matthew C. George, Paul V. Braun

Research output: Contribution to journalArticle

Abstract

We demonstrate an optical interference-based photochemical method for the high-resolution localization of nanoparticles inside colloidal crystals or other porous structures. The method specifically relies on photoinduced inversion of the colloidal crystal surface charge to drive the localized deposition of charged gold nanoparticles. 4-Bromomethyl-3-nitrobenzoic acid (BNBA) was used as a photocleavable linker, and dansylamide was attached to BNBA to increase the absorption at 351 nm. Twobeam interference lithography was used for high-resolution optical patterning of the colloidal crystals; the resulting pattern was then decorated with functional nanoparticles. The periodicity of the pattern was 400 nm, and the width of the gold nanoparticle decorated region was ∼200 nm. Our strategy of using photoswitching in a refractive-index-matched porous medium followed by the attachment of nanoparticles to the photoswitched region should be applicable to wide classes of charged nanoparticles.

Original languageEnglish (US)
Pages (from-to)9958-9959
Number of pages2
JournalJournal of the American Chemical Society
Volume132
Issue number29
DOIs
StatePublished - Jul 28 2010

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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