Silica-coating of fluorescent polystyrene microspheres by a modified Stöber method and their stability against photo-bleaching

Yoshio Kobayashi, Kiyoto Misawa, Masaki Kobayashi, Motohiro Takeda, Mikio Konno, Masanobu Satake, Yoshiyuki Kawazoe, Noriaki Ohuchi, Atsuo Kasuya

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Submicron-sized polystyrene spheres incorporating fluorescence dyes (fluorescent microspheres) were coated with silica by means of a seeded polymerization technique based on the Stöber method. Silica-coating of the fluorescent microspheres with a size of 100 nm was performed in the presence of 0 - 10 g/l polyvinylpyrrolidone (PVP), 1-13 mol/l water, 0 - 0.8 mol/l aq. ammonia and 0.00038 - 0.2 mol/l tetraethoxyorthosilicate (TEOS). The addition of PVP was found to suppress the generation of free silica particles and produced no shell-free fluorescent microspheres improving the uniformity of shell thickness of silica-coated fluorescent microspheres. Silica shell thickness increased from 11 to 63 nm with increasing TEOS concentration at 10 g/l PVP, 0.4 mol/l aq. ammonia and 11 mol/l water. Silica-coated fluorescent microspheres showed more stable fluorescence to laser-irradiation than uncoated fluorescent microspheres.

Original languageEnglish
JournalE-Polymers
Publication statusPublished - 2005 Nov 8

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Polymers and Plastics

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