title: Synthesis of Silver-Strontium Titanate Hybrid Nanoparticles by Sol-Gel-Hydrothermal Method.
abstract: Silver (Ag) nanoparticle-loaded strontium titanate (SrTiO₃) nanoparticles were attempted to be synthesized by a sol-gel-hydrothermal method. We prepared the titanium oxide precursor gels incorporated with Ag⁺ and Sr2+ions with various molar ratios, and they were successfully converted into the Ag-SrTiO₃ hybrid nanoparticles by the hydrothermal treatment at 230 °C in strontium hydroxide aqueous solutions. The morphology of the SrTiO₃ nanoparticles is dendritic in the presence and absence of Ag⁺ ions. The precursor gels, which act as the high reactive precursor, give rise to high nucleation and growth rates under the hydrothermal conditions, and the resultant diffusion-limited aggregation phenomena facilitate the dendritic growth of SrTiO₃. From the field-emission transmission electron microscope observation of these Ag-SrTiO₃ hybrid nanoparticles, the Ag nanoparticles with a size of a few tens of nanometers are distributed without severe agglomeration, owing to the competitive formation reactions of Ag and SrTiO₃.
authors.affiliation: Graduate School Department of Interdisciplinary Research, University of Yamanashi, 4-4-37 Takeda, Kofu 400-8510, Japan. sueno@yamanashi.ac.jp.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ueno
authors.affiliation: Graduate School Department of Interdisciplinary Research, University of Yamanashi, 4-4-37 Takeda, Kofu 400-8510, Japan. knakashima@yamanashi.ac.jp.
authors.forename: Kouichi
authors.initials: K
authors.lastname: Nakashima
authors.affiliation: Graduate School Department of Interdisciplinary Research, University of Yamanashi, 4-4-37 Takeda, Kofu 400-8510, Japan. g14ma018@yamanashi.ac.jp.
authors.forename: Yasunao
authors.initials: Y
authors.lastname: Sakamoto
authors.affiliation: Graduate School Department of Interdisciplinary Research, University of Yamanashi, 4-4-37 Takeda, Kofu 400-8510, Japan. swada@yamanashi.ac.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Wada
keywords: hybrid particles; silver nanoparticles; sol-gel-hydrothermal method; strontium titanate