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Research Article

Preparation of Ag/SiO₂ Nanosize Composites by a Reverse Micelle and Sol−Gel Technique

Tuo Li, Jooho Moon, Augusto A. Morrone, John J. Mecholsky, Daniel R. Talham, and James H. Adair*

Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400

Langmuir, 1999, 15 (13), pp 4328–4334

DOI: 10.1021/la970801o

Publication Date (Web): May 18, 1999

Corresponding author. Present address: Materials Research Laboratory, Pennsylvania State University, University Park, PA 16802.

Abstract

Spherical nanosize Ag/SiO₂ composite particles have been synthesized within reverse micelles via metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilane (TEOS) within the microemulsion. Composite particles in the size range 20−35 nm are produced. As the molar ratio of water to surfactant is increased above 10, the size distribution broadens. Absorption spectra have been used to dynamically monitor the reaction and growth. The effects of other synthesis parameters, such as the molar ratio of water to TEOS and the amount of base catalyst, are discussed. Possible mechanisms for the formation of the nanocomposite particles are also discussed.

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History

Published In Issue June 22, 1999
Received July 17, 1997
Revised March 9, 1999

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Research Article

Preparation of Ag/SiO₂ Nanosize Composites by a Reverse Micelle and Sol−Gel Technique