Physics – Condensed Matter – Materials Science
Scientific paper
2011-04-26
Phys. Rev. Lett. 107, 225503 (2011)
Physics
Condensed Matter
Materials Science
4 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.107.225503
Applying focused ion beam (FIB) nanotomography and Rutherford backscattering spectroscopy (RBS) to dealloyed platinum-aluminum thin films an in-depth analysis of the dominating physical mechanisms of porosity formation during the dealloying process is performed. The dynamical porosity formation due to the dissolution of the less noble aluminum in the alloy is treated as result of a reaction-diffusion system. The RBS analysis yields that the porosity formation is mainly caused by a linearly propagating diffusion front, i.e. the liquid/solid interface, with a uniform speed of 42(3) nm/s when using a 4M aqueous NaOH solution at room temperature. The experimentally observed front evolution is captured by the normal diffusive Fisher-Kolmogorov-Petrovskii-Piskounov (FKPP) equation and can be interpreted as a branching random walk phenomenon. The etching front produces a gradual porosity with an enhanced porosity in the surface-near regions of the thin film due to prolonged exposure of the alloy to the alkaline solution.
Döbeli Max
Galinski Henning
Gauckler Ludwig J.
Mornaghini Flavio C. F.
Rechberger Felix
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