Fabrication and fluorescence properties of multilayered core-shell particles composed of quantum dot, gadolinium compound, and silica

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A preparation method for multilayered quantum dot/silica/gadolinium compound/silica (QD/Si/Gd/Si) core-shell particles is proposed. Silica (Si)-coated quantum dot (QD/Si) core-shell particles were prepared by a Stöber method at room temperature in water/ethanol solution with TEOS and NaOH in the presence of QD nanoparticles. Succeeding gadolinium compound (Gd)-coating of the QD/Si core-shell particles was performed by a homogeneous precipitation method using Gd(NO 3) 3, urea, and polyvinylpyrrolidone in the presence of the QD/Si particles, which resulted in production of multilayered QD/silica/gadolinium compound (QD/Si/Gd) core-shell particles. For Si-coating of the QD/Si/Gd particles, the Stöber method was performed at room temperature in water/ethanol solution with TEOS and NaOH in the presence of the QD/Si/Gd particles. Consequently, Si-coated QD/Si/Gd, i.e., multilayered QD/Si/Gd/Si, core-shell particles were obtained. The QD/Si/Gd/Si particles revealed strong fluorescence, which was almost comparable to the QD particles with no shells. These particles are expected to be harmless to living bodies, and have dual functions of magnetic resonance imaging and fluorescence.

Original languageEnglish
Pages (from-to)1852-1859
Number of pages8
JournalJournal of Materials Science
Volume47
Issue number4
DOIs
Publication statusPublished - 2012 Feb

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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