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

Eduardo Larios; Lilián Calderón; Karen Guerrero; Emanuel Pinedo; Amir Maldonado; Judith Tanori

doi:10.1080/01932690903294147

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

Eduardo Larios, Lilián Calderón, Karen Guerrero, Emanuel Pinedo, Amir Maldonado, Judith Tanori

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H ₂PdCl 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 ₂PdCl 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.

Original language	English
Pages (from-to)	1360-1367
Number of pages	8
Journal	Journal of Dispersion Science and Technology
Volume	33
Issue number	9
DOIs	https://doi.org/10.1080/01932690903294147
State	Published - Sep 2012

Bibliographical note

Funding Information:
E. R.-L. acknowledges a fellowship from Conacyt (Mexico). The TEM experiments were performed in the Laboratorio de Microscopía Electrónica of Universidad de Sonora.

Keywords

Core-shell
microemulsions
nanoparticles
palladium-gold

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title = "Synthesis of Core-Shell (Pd-Au) Bimetallic Nanoparticles in Microemulsions",

abstract = "Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H 2PdCl 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 2PdCl 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.",

keywords = "Core-shell, microemulsions, nanoparticles, palladium-gold",

author = "Eduardo Larios and Lili{\'a}n Calder{\'o}n and Karen Guerrero and Emanuel Pinedo and Amir Maldonado and Judith Tanori",

note = "Funding Information: E. R.-L. acknowledges a fellowship from Conacyt (Mexico). The TEM experiments were performed in the Laboratorio de Microscop{\'i}a Electr{\'o}nica of Universidad de Sonora.",

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AU - Larios, Eduardo

AU - Calderón, Lilián

AU - Guerrero, Karen

AU - Pinedo, Emanuel

AU - Maldonado, Amir

AU - Tanori, Judith

N1 - Funding Information: E. R.-L. acknowledges a fellowship from Conacyt (Mexico). The TEM experiments were performed in the Laboratorio de Microscopía Electrónica of Universidad de Sonora.

PY - 2012/9

Y1 - 2012/9

N2 - Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H 2PdCl 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 2PdCl 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.

AB - Palladium-gold core-shell nanoparticles were synthesized in the aqueous domains of water in oil microemulsions by the sequential reduction of H 2PdCl 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 2PdCl 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.

KW - Core-shell

KW - microemulsions

KW - nanoparticles

KW - palladium-gold

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DO - 10.1080/01932690903294147

M3 - Artículo

SN - 0193-2691

VL - 33

SP - 1360

EP - 1367

JO - Journal of Dispersion Science and Technology

JF - Journal of Dispersion Science and Technology

IS - 9

ER -

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

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Keywords

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