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Adrien Chauvin: The gold-copper binary system: the relevance of the X-ray analysis for the study of the dealloying process
May 9 @ 14:00 - 15:00
Thursday, 9. 5. 2019, 14.00,
Lecture room F2 (1st floor), MFF UK, Ke Karlovu 5
Department of Condensed Matter Physics, Charles University, Prague, The Czech Republic
The gold-copper binary system: the relevance of the X-ray analysis for the study of the dealloying process
Tumbaga – as called by the Spaniards – is an alloy of gold and copper used for jewelry by the pre-Columbian cultures in Central America. The popularity of this alloy comes from its ease to shape by melting and the inert property of gold. Due to these conveniences, this alloy was, latter, widely used for the analysis of nanoporous gold. Actually, studies reveal the impressive capabilities of nanoporous gold for applications in various technological areas such as biotechnology1, electronics2 or energy storage3.
In order to obtain such a structure, the most versatile way is to use the dealloying process. It consists of removing the less noble metal from an alloy to make it nanoporous. Most of the studies deal with the creation of the alloy precursor, indeed, by melting. However, this synthesis process reveals some limitation and especially for the creation of complex nanoporous architectures at nanoscale after dealloying. Since a few decades, PVD techniques gain strong interest to overcome these limitations. Indeed, these techniques are very easy to handle and show a high versatility to create a wide variety of morphologies.
In this presentation, two innovative way of tuning the nanoporous gold architecture at the nanoscale will be presented. This includes the fine tuning of the initial gold-copper alloy by using magnetron co-sputtering. In the first part, the morphology of nanoporous gold thin films will be modified by using the residual stress originating from the sputtering of the gold-copper alloy. And in the second part, the premise of an original way to prepare nanoporous gold nanoparticles will be presented.
1. Kurtulus O. et al, Nanoscale, 2014, 6, 7062.
2. Chauvin A. et al, NPJ flexible electronics, 2019, 3, 5.
3. Kim S.-I. et al, Nano Energy, 2016, 24, 17.