Fabrication of two-dimensional Au@FePt core-shell nanoparticle arrays by photochemical metal deposition

Härtling, Thomas; Uhlig, Tino; Seidenstücker, Axel; Bigall, Nadja C.; Olk, Phillip; Wiedwald, Ulf; Han, Luyang; Eychmüller, Alexander; Plettl, Alfred; Ziemann, Paul; Eng, Lukas M.
May 2010
Applied Physics Letters;5/3/2010, Vol. 96 Issue 18, p183111
Academic Journal
In this report, we experimentally demonstrate that single platinum nanoparticles exhibit the necessary catalytic activity for the optically induced reduction of H[AuCl4] complexes to elemental gold. This finding is exploited for the parallel Au encapsulation of FePt nanoparticles arranged in a self-assembled two-dimensional array. Magnetic force microscopy reveals that the thin gold layer formed on the FePt particles leads to a strongly increased long-term stability of their magnetization under ambient conditions.


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