Topics in Catalysis

, Volume 35, Issue 3–4, pp 321–325 | Cite as

Photocatalytic Preparation of Encapsulated Gold Nanoparticles by Jingle-bell-shaped Cadmium Sulfide–silica Nanoparticles

  • Bonamali Pal
  • Tsukasa Torimoto
  • Shigeru Ikeda
  • Tamaki Shibayama
  • Kenji Sugawara
  • Heishichiro Takahashi
  • Bunsho Ohtani
Article

Gold (Au) nanoparticles were deposited inside silica: (SiO2) shells containing cadmium sulfide (CdS) nanoparticles through photocatalytic reduction of potassium dicyanogold(I) by CdS. Photocatalytic Au deposition occurred only when core-shell nanoparticles having a void space between the core and shell, i.e., a jingle-bell-shaped structure, were used. These core-shell nanoparticles were prepared by size-selective photoetching of SiO2 -covered CdS nanoparticles. The size of Au nanoparticles could be controlled by adjustment of the void space in SiO2-covered CdS. Dissolution of CdS by acid treatment from the Au-deposited jingle-bell nanoparticles did not have any effect on the surface-plasmon absorption by Au. These facts indicate that Au nanoparticles of adjustable size can be prepared in an SiO2 shell that prevents mutual coalescence of Au nanoparticles but allows permeation of molecules and ions.

Keywords

core-shell particles jingle-bell structure nanoparticle cadmium sulfide (CdS) gold (Au) size-selective photoetching photodeposition 

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Bonamali Pal
    • 1
  • Tsukasa Torimoto
    • 1
    • 2
  • Shigeru Ikeda
    • 2
  • Tamaki Shibayama
    • 3
  • Kenji Sugawara
    • 4
  • Heishichiro Takahashi
    • 4
  • Bunsho Ohtani
    • 2
  1. 1.“Light and Control”, PRESTOJapan Science and Technology AgencySaitamaJapan
  2. 2.Catalysis Research CenterHokkaido UniversitySapporoJapan
  3. 3.Graduate School of EngineeringHokkaido UniversitySapporoJapan
  4. 4.Center for Advanced Research of Energy TechnologyHokkaido UniversitySapporoJapan

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