Synthesis of Core-Shell (Pd-Au) Bimetallic Nanoparticles in Microemulsions

Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H 2 PdCl 4 and HAuCl 4 . The nanoparticles were characterized by ultraviolet-visible (UV-vis) spectroscopy and transmission electron microscopy (TEM). The UV-...

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Bibliographic Details
Published in:Journal of dispersion science and technology 2012-09, Vol.33 (9), p.1360-1367
Main Authors: Larios, Eduardo, Calderón, Lilián, Guerrero, Karen, Pinedo, Emanuel, Maldonado, Amir, Tanori, Judith
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Core-shell
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
microemulsions
nanoparticles
palladium-gold
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H 2 PdCl 4 and HAuCl 4 . The nanoparticles were characterized by ultraviolet-visible (UV-vis) spectroscopy and transmission electron microscopy (TEM). The UV-vis spectra confirm the presence of palladium nanoparticles after reducing H 2 PdCl 4 . These particles have been used as seeds for the core-shell particles. UV-vis spectra show that, after reducing HAuCl 4 , the surface plasmon absorption of the nanoparticles is dominated by gold, revealing the encapsulation of the palladium seeds. These results agree with crystallographic analysis performed with high-resolution TEM pictures, as well as with selected area electron diffraction. The TEM pictures show the core-shell nanoparticles with an average diameter of 9.1 nm, as compared with 5 nm for the palladium seeds, in good agreement with the used Pd:Au molar ratio.
ISSN:0193-2691
1532-2351
DOI:10.1080/01932690903294147