Journal of Sol-Gel Science and Technology

, Volume 55, Issue 1, pp 79–85

Direct coating of quantum dots with silica shell

  • Yoshio Kobayashi
  • Takuya Nozawa
  • Tomohiko Nakagawa
  • Kohsuke Gonda
  • Motohiro Takeda
  • Noriaki Ohuchi
  • Atsuo Kasuya
Original Paper

Abstract

This paper describes a method for direct coating of fluorescent semiconductor nanoparticles with silica shell. The fluorescent semiconductor nanoparticles used were CdSexTe1–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.

Keywords

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

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Yoshio Kobayashi
    • 1
  • Takuya Nozawa
    • 1
  • Tomohiko Nakagawa
    • 2
  • Kohsuke Gonda
    • 2
  • Motohiro Takeda
    • 2
  • Noriaki Ohuchi
    • 2
  • Atsuo Kasuya
    • 3
  1. 1.Department of Biomolecular Functional Engineering, College of EngineeringIbaraki UniversityHitachiJapan
  2. 2.Division of Surgical Oncology, Graduate School of MedicineTohoku UniversitySendaiJapan
  3. 3.Center for Interdisciplinary ResearchTohoku UniversitySendai-shiJapan

Personalised recommendations