Facile preparation of highly-scattering metal nanoparticle-coated polymer microbeads and their surface plasmon resonance

Jung Hyun Lee, Mahmoud A. Mahmoud, Valerie Sitterle, Jeffrey Sitterle, J. Carson Meredith

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

We report on the facile preparation of highly scattering metal-coated polystyrene (PS) latex beads by using solvent-controlled heterocoagulation. Starting with an aqueous dispersion of PS beads and poly(vinyl pyrrolidone)-capped metal nanoparticles (NPs), homogeneous and dense metal coatings were obtained by the controlled addition and removal of tetrahydrofuran (THF). Different sizes (30, 60, and 80 nm), chemistries (gold and silver), and shapes (sphere and cube) of NPs were successfully incorporated on commercially available PS beads. The resulting metal coated-PS microspheres exhibited highly enhanced scattering and tunable optical characteristics useful for biomedical imaging, sensors, and opto-electronic devices. The fabricated composite beads were stable, with no loss of metal coating, during long-term water storage. The morphology and coverage of the metal coating, and the bead's optical properties, were controllable over a wide range by the concentration of THF and metal NP, and NP size, shape, and chemistry.

Original languageEnglish
Pages (from-to)5048-5049
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number14
DOIs
Publication statusPublished - 2009 Apr 15
Externally publishedYes

ASJC Scopus subject areas

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

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