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Synthesis and Characterization of Pd/Ag/SiO2 Nano-Composite Materials

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Abstract:

Pd/Ag/SiO2 sols and powder materials were prepared by adding AgNO3 and Pd (NO3)2·2H2O into a methyl-modified silica sol. Tetraethylorthosilicate and methyltriethoxysilane were used as the silica precursor for the sol-gel reaction. The obtained SiO2 sols and powder materials were characterized by sol particle size distribution, zeta potential analysis, UV-Vis spectra, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) measurement. It was found that most of the particle sizes of the prepared Pd/Ag/SiO2 sols are about 2~10 nm with narrow size distribution. The zeta potential of Pd/Ag/SiO2 sol with Pd/Ag molar ratio of 7.5/2.5 presents the highest value. The FTIR analysis substantiates that the Si-CH3 groups exist in the silica network and the formed Pd/Ag/SiO2 sol particles possess linear structure. XRD characterization indicates that the Pd2+ and Ag+ in the Pd/Ag/SiO2 materials had be reduced to Pd0 and Ag0, respectively, after annealed in a nitrogen atmosphere at 350°C.

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Periodical:

Key Engineering Materials (Volume 726)

Pages:

204-209

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.726.204

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Online since:

January 2017

Authors:

Jing Yang*, Bao Song Li, Zhi Tong, Rui Hua Mu

Keywords:

Particle Size Distribution, Pd/Ag/SiO2, Sol-Gel Method, Zeta Potential Analysis

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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