Abstract
Aiming at the physical and chemical mechanisms of surface alloying at the nanometer scalein immiscible binary metallic systems, we have studied the Mo growth mode upondepositing Mo on the surface of Au nanocrystalline films via molecular beam epitaxy.Mo–Au surface alloying was observed when Mo was deposited on Au nanocrystallinefilms at a high temperature. A relevant thermodynamic and kinetic model wasestablished to address the surface alloying at the nanoscale. The size-dependentinterface energy between the Mo particles and the Au nanocrystalline films, as thethermodynamic driving force, is attributed to be the reason behind the physical andchemical mechanisms of the Mo–Au surface alloying on Au nanocrystalline films.
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