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Issue 1, 2015
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Improved catalytic activity and surface electro-kinetics of bimetallic Au–Ag core–shell nanocomposites

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Abstract

This paper demonstrates the preparation of core–shell nanocomposites (NCs) of Aucore–Agshell (Au@Ag) and Agcore–Aushell (Ag@Au) for measuring their catalytic activity and electro-kinetic properties relative to their respective monometallic counterparts. A significant blue-shift (530 → 408 nm) and a red-shift (420 → 550 nm) of the surface plasmon band for Au@Ag and Ag@Au NCs, respectively, were observed due to increased size of binary composites depending on the nature of the core and shell material. The thickness of the deposited Ag shells varied from ∼3–10 nm on the Au core leading to the formation of Au@Ag NCs. On the other hand, the Ag core served as a sacrificial template, where Ag@Au NCs were converted to hollow Ag–Au alloy shells (∼15 nm) because of the galvanic reaction between them due to the difference in their redox potential. An increased zeta potential was found for resulting Au@Ag (+57.8 mV) and hollow Ag–Au alloy shell (−20.13 mV) NCs in comparison to monometallic Au (−6.13 mV) and Ag nanospheres (−5.74 mV) due to surface passivation with aqueous AgNO3 and AuCl4 solution, respectively. These bimetallic NCs exhibited ∼2 times higher catalytic activity than the monometallic nanoparticles depending on the shell thickness and the core of the respective metals for the nitrobenzene and 1,3-dinitrobenzene reduction.

Graphical abstract: Improved catalytic activity and surface electro-kinetics of bimetallic Au–Ag core–shell nanocomposites

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Publication details

The article was received on 22 Aug 2014, accepted on 11 Oct 2014 and first published on 13 Oct 2014


Article type: Paper
DOI: 10.1039/C4NJ01419G
Author version available: Download Author version (PDF)
Citation: New J. Chem., 2015,39, 304-313
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    Improved catalytic activity and surface electro-kinetics of bimetallic Au–Ag core–shell nanocomposites

    A. Monga and B. Pal, New J. Chem., 2015, 39, 304
    DOI: 10.1039/C4NJ01419G

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