Preparation of highly dispersed core/shell-type titania nanocapsules containing a single Ag nanoparticle

Hideki Sakai, Takashi Kanda, Hirobumi Shibata, Takahiro Ohkubo, Masahiko Abe

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Core/shell-type titania nanocapsules containing a single Ag nanoparticle were prepared. Ag nanoparticles were prepared using the reduction of silver nitrate with hydrazine in the presence of cetyltrimethylammonium bromide (CTAB) as protective agent. The sol-gel reaction of titanium tetraisopropoxide (TTIP) was used to prepare core/shell-type titania nanocapsules with CTAB-coated Ag nanoparticles as the core. TEM observations revealed that the size of the core (Ag particle) and the thickness of the shell (titania) of the core/shell particles obtained are about 10 nm and 5-10 nm, respectively. In addition, the nanocapsules were found to be dispersed in the medium as individual particles without aggregation. Moreover, titania coating caused the surface plasmon absorption of Ag nanoparticles to shift toward the longer wavelength side.

Original languageEnglish
Pages (from-to)4944-4945
Number of pages2
JournalJournal of the American Chemical Society
Issue number15
Publication statusPublished - Apr 19 2006
Externally publishedYes


ASJC Scopus subject areas

  • Chemistry(all)

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