Direct silica-coating of quantum dots

Yoshio Kobayashi, Takuya Nozawa, Motohiro Takeda, Noriaki Ohuchi, Atsuo Kasuya

Research output: Contribution to journalArticle

8 Citations (Scopus)


A method for direct silica-coating of fluorescent semiconductor nanoparticles is proposed. The fluorescent semiconductor nanoparticles used are quantum dots (Q-dots), which are CdSexTe1-x nanoparticles coated with ZnS and succeedingly surface-modified with amino groups. The silica-coating was performed in the presence of the Q-dots in 1-15 M H2O, 0.4 × 10-4-40 × 10-4 M NaOH and 0.5 × 10-4-50 × 10-4 M tetraethyl orthosilicate (TEOS). Silica shells were formed at 5M H2O and 4 × 10-4M NaOH. Under these concentrations of H2O and NaOH, the particle size of silica-coated Q-dots could be varied from 15.8 to 31.7 nm as the TEOS concentration was increased from 2.5 × 10-4 to 50 × 10-4 M. The silica-coated Q-dots showed fluorescence as well as the uncoated Q-dots.

Original languageEnglish
Pages (from-to)490-493
Number of pages4
Issue number6
Publication statusPublished - 2010 Jul 13


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

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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  • Cite this

    Kobayashi, Y., Nozawa, T., Takeda, M., Ohuchi, N., & Kasuya, A. (2010). Direct silica-coating of quantum dots. JOURNAL of CHEMICAL ENGINEERING of JAPAN, 43(6), 490-493.