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Bimetallic noble metal nanocrystals have wide applications in the low temperature fuel cells.Based on at oms diffusion mechanism,1-6 Au microsheets supported Pt nanocrystals(Pt-on-Au)nanostructures successfully tr ansform into Au microsheets supported Pt-Au alloy nanocrystals(PtAu-on-Au)nanostructures under the hydroth ermal condition,which is confirmed by transmission electron microscopy and energy-dispersive X-ray maps.