Direct coating of quantum dots with silica shell

Yoshio Kobayashi, Takuya Nozawa, Tomohiko Nakagawa, Kohsuke Gonda, Motohiro Takeda, Noriaki Ohuchi, Atsuo Kasuya

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

This paper describes a method for direct coating of fluorescent semiconductor nanoparticles with silica shell. The fluorescent semiconductor nanoparticles used were CdSe x Te1-x nanoparticles coated with ZnS and succeedingly surface-modified with carboxyl groups, or quantum dots (Q-dots). The Q-dots were silica-coated by performing sol-gel reaction of tetraethyl orthosilicate (TEOS) using NaOH as a catalyst in the presence of the Q-dots. Quasi-perfect Q-dots/silica core-shell particles were formed at 5.0 M H2O and 4.0 × 10-4 M NaOH. Under these concentrations of H2O and NaOH, the particle size of Q-dots/silica particles could be varied from 20.1 to 38.1 nm as the TEOS concentration increased from 2.5 × 10-4 to 50 × 10-4 M. The Q-dots/silica particles showed fluorescence as well as the uncoated Q-dots.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalJournal of Sol-Gel Science and Technology
Volume55
Issue number1
DOIs
Publication statusPublished - 2010 Jul

Keywords

  • Core-shell
  • Nanoparticle
  • Quantum dots
  • Silica-coating
  • Sol-gel
  • Stöber method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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