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Preparation and Characterization of Ag@TiO 2 Core‐Shell Nanoparticles in Water‐in‐Oil Emulsions

2005; Wiley; Volume: 2005; Issue: 9 Linguagem: Inglês

10.1002/ejic.200400811

1099-0682

Dan Zhang, Xi‐Ming Song, Rongwei Zhang, Ming Zhang, Fengqi Liu,

Advanced Photocatalysis Techniques

Abstract We report a simple route for the effective synthesis of Ag@TiO 2 nanoparticles in water‐in‐oil (w/o) emulsions and provide detailed characterization of the materials with TEM, TG‐DTA, IR, XRD, and SPS measurements. Such core‐shell hybrid nanoparticles can be fabricated in two simple steps: the formation of the silver core by the reduction of a Tollens reagent with glucose in the water phase, and the hydrolysis of Ti(OC 4 H 9 ) 4 at the water/oil interface for the formation of the amorphous TiO 2 shell. The procedure led to the formation of nanocomposites with a crystalline core in a size range from 5 to 15 nm in diameter and an amorphous shell of 6–10 nm thickness in a typical synthesis. The shell was converted to crystalline oxide upon thermal treatment. Surface photovoltaic spectroscopy (SPS) measurements indicate that the materials have potential for application in photoinduced electron storage and photocatalysis. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)