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Deposition of Gold Nanoparticles on Silica Spheres: A Sonochemical Approach.

✍ Scribed by V. G. Pol; A. Gedanken; J. Calderon-Moreno

Publisher
John Wiley and Sons
Year
2003
Weight
6 KB
Volume
34
Category
Article
ISSN
0931-7597

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✦ Synopsis

Deposition of Gold Nanoparticles on Silica Spheres: A Sonochemical Approach.

-Au particles with an average size of β‰ˆ5 nm are deposited on the surface of silica spheres by ultrasonic irradiation of a slurry of silica submicrospheres, HAuCl4, and NH3 in an aqueous medium (Ar, room temperature, 45 min). The samples are characterized by XRD, EDAX, TEM, TGA, DSC, HR-SEM, and FT-IR, photoacoustic, and UV/VIS spectroscopy. A unique crystallization process of the silica particles assisted by the Au nanoparticles is observed yielding the cristobalite phase of silica at a relatively low temperature. The preparation method is a simple, efficient, one-step synthesis that produces a uniform coating of Au nanoparticles on the silica submicrospheres. -(POL, V.

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