科研之友
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摘要
We present a systematic survey of unprotected Ag-Au nanoclusters prepared by inert gas aggregation. The clusters are initially fully and homogeneously alloyed, exhibiting icosahedral and decahedral structural motifs. Imaging using scanning transmission electron microscopy indicates that over a period of up to 2 yr, the nanoclusters undergo structural transitions into phase-segregated core-shell and Janus particles with Ag-Au cores and Ag(x)O shells. Larger Janus particles undergo a ripening process which results in division into separate Ag-Au-rich and Ag(2)O-rich particles. We propose that oxidation of the Ag component and subsequent diffusion of Ag(x)O are responsible for the observed phenomena.
- 出版日期2011-10-24
