Non-random palladium/gold nanoparticles synthesized using galvanic replacement reaction
20 March 2009Nanomaterials that are composed of two metallic ingredients are best suitable for many new advance applications including catalytic and electronic applications as these bimetallic nanoparticles have unique physical and electronic properties, however previous research shows that palladium and gold nanoparticles have excellent catalytic properties and therefore can be used in alternative energy applications. The bimetallic nanoparticles having non-random structure are most suitable for many novel applications.
Actually synthesizing a non-random structure is quite a difficult task and it requires handling of many-advanced characterization techniques so that we get the desired end result. Now, researchers from University of Delaware and Brookhaven, Yeshiva University have successfully synthesized a palladium/gold nanocomposite that has nano-random structure.
Galvanic replacement method, which is well known technology that is used for making batteries, is selected for the fabrication of palladium and gold bimetallic nanoparticles. Due to electrical potential difference between various metals, here in galvanic replacement method, one metal act as cathode and another act as anode. The reaction was carried out between a 2.5 nanometer thick palladium nanowire and gold chloride solution in toluene. Various characterization techniques including electron microscopy, UV-VIS absorption, X-ray diffraction etc. were applied to monitor the galvanic reaction.
Researchers found that the extended X-ray absorption fine structure (EXAFS) technique is best suitable for monitoring the galvanic reaction as it provides the clear idea about the structure and geometry of the end product. Using the technique the research team was able to stabilize the non-random structure by addition of alkylamine, which stabilize the palladium on surface so that the product remains uniform and non-random.
The research finding was published in the January 23, 2008 issue of the Journal of the American Chemical Soceity.
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