25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

Determination of kinetics of pores formation during temperature controlled chemical de-alloying of Au-Ag50 alloys by in-situ SAXS/WAXS

27 Nov 2015, 13:30
National Centre for Synchrotron Science

National Centre for Synchrotron Science

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: AM-24
Poster Advanced Materials Poster Session 2


Mr Bao Lin (Deakin University)


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

Primary author

Mr Bao Lin (Deakin University)


Prof. Lingxue Kong (Deakin University) Dr Ludovic Dumée (Deakin University) Prof. Peter Hodgson (Deakin University)

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