title: Preparation of highly dispersed core/shell-type titania nanocapsules containing a single Ag nanoparticle.
abstract: 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.
authors.affiliation: Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. hisakai@rs.noda.tus.ac.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Sakai
authors.forename: Takashi
authors.initials: T
authors.lastname: Kanda
authors.forename: Hirobumi
authors.initials: H
authors.lastname: Shibata
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ohkubo
authors.forename: Masahiko
authors.initials: M
authors.lastname: Abe