Speaker
Mr
Bao Lin
(Deakin University)
Description
The formation of nano-porous Au structures has potential for the design of advanced sensors, catalysts and bio-compatible separation media. Here, chemical de-alloying of Au-Ag50 alloy thin films were performed at different temperatures to alter the pore formation kinetics as well as the final morphology of the materials. Fractal dimensions at low q were significantly reduced with increasing temperatures affecting the fractal geometry of the pore propagation from surface fractal to volume fractal. The SAXS/WAXS in situ tests performed at the Australian Synchrotron were completed with scanning electron micrographs, x-ray diffraction, Kelvin probe and atomic force microscopy roughness determinations to produce a highly versatile nano-porous formation route. Following the Porod scattering model, the de-alloyed structures were found to be mathematically self-similar rather than amorphous and the pure Au ligaments dimension and the through pores size were found to increase by up to 50 % with increasing solutions temperature while the overall porosity was found to remain constant.
| Keywords | In-situ, De-alloying, porous gold |
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Primary author
Mr
Bao Lin
(Deakin University)
Co-authors
Prof.
Lingxue Kong
(Deakin University)
Dr
Ludovic Dumée
(Deakin University)
Prof.
Peter Hodgson
(Deakin University)
