Thiry, D., Molina-Luna, L., Gautron, E., Stephant, N., Chauvin, A., Du, K., Ding, J., Choi, C.-H., Tessier, P.-Y. & El Mel, A.-A. (2015) The Kirkendall Effect in Binary Alloys: Trapping Gold in Copper Oxide Nanoshells. Chem. Mat. 27 6374–6384.
Added by: Laurent Cournède (2016-03-10 18:36:41)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0897-4756
Clé BibTeX: Thiry2015
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Mots-clés: hollow nanoparticles, metal-oxides, nanoporous gold, nanoscale, nanotubes, nanowires, oxidation, rayleigh-instability, room-temperature, shell nanoparticles
Créateurs: Chauvin, Choi, Ding, Du, El Mel, Gautron, Molina-Luna, Stephant, Tessier, Thiry
Collection: Chem. Mat.
Consultations : 4/444
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In this work, we report on the Kirkendallinduced hollowing process occurring upon thermal oxidation of gold copper (Au Cu) alloy nano-wires and nano dots. Contrary to elemental metals, the oxidation reaction results in the formation of gold nanostructures trapped inside hollow copper oxide nanoshells. We particularly focus on the thermally activated reshaping mechanism of the gold phase forming the core. Using scanning transmission electron microscopy coupled to energy dispersive X-ray spectroscopy mapping, we show that such a reshaping is a consequence to the reorganization of gold at the atomic level. The gold nanostructures forming the core were found to be strongly dependent on the chemical composition of the alloy and the oxidation temperature. By selecting the appropriate annealing conditions (i.e., duration, temperature), one can easily synthesize various heteronanostructures: wire-in-tube, yolk shell, oxide nanotubes embedding or decorated by Au nanospheres. The advanced understanding of the Kirkendall effect in binary alloy nanostructures that we have achieved in this work will open a new door for the fabrication and the design of novel multifunctional heteronanostructures for potential applications in different research fields including nano-optics/photonics, biomedicine, and catalysis.
Added by: Laurent Cournède