Nano Archive

Size and composition tunable Ag-Au alloy nanoparticles by replacement reactions

Zhang, Qingbo and Lee, Jim Yang and Yang, Jun and Boothroyd, Chris and Zhang, Jixuan (2007) Size and composition tunable Ag-Au alloy nanoparticles by replacement reactions. NANOTECHNOLOGY, 18 (24).

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Official URL: http://dx.doi.org/10.1088/0957-4484/18/24/245605

Abstract

Ag - Au alloy nanoparticles with tunable size and composition were prepared by a replacement reaction between Ag nanoparticles and HAuCl4 at elevated temperatures. The formation of homogeneous alloy nanoparticles was confirmed by selected-area energy-dispersive x-ray spectroscopy (SAEDX), UV-visible absorption spectroscopy, high resolution transmission electron microscopy (HRTEM) and electron diffraction. This method leverages upon the rapid interdiffusion of Ag and Au atoms in the reduced dimension of a nanoparticle, elevated temperatures and the large number of vacancy defects created in the replacement reaction. This method of preparation has several notable advantages: ( 1) independent tuning of the size and composition of alloy nanoparticles; ( 2) production of alloy nanoparticles in high concentrations; ( 3) general utility in the synthesis of alloy nanoparticles that cannot be obtained by the co-reduction method.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:3267
Deposited By:Farnush Anwar
Deposited On:15 Jan 2009 15:49
Last Modified:15 Jan 2009 15:49

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