Enhanced anomalous diffusion of sputtered atoms in nanosized pores

Sujuan Wu, Pascal Brault, Cong Wang and Thierry Sauvage

Physica A: Statistical Mechanics and its Applications, 2011, vol. 390, issue 11, 2112-2116

Abstract: Plasma sputtering deposition of platinum catalysts in porous anodic aluminum oxide (AAO) templates is shown to generate an anomalous superdiffusion concentration profile. The growth of an overlayer between the hexagonal array of pores is shown to enhance the diffusion into the pores, leading to a diffusion coefficient having superlinear time dependence. The Pt clusters in the pores have a mean size of 10 nm and almost concentrate on the inner pore surface, and are present up to a depth of 6 μm.

Keywords: Atom anomalous diffusion; Cylindrical pore; Atom transport; Concentration profile (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:390:y:2011:i:11:p:2112-2116

DOI: 10.1016/j.physa.2011.02.001

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