Morphology and structural stability of Pt–Pd bimetallic nanoparticles*
Liu Tun-Donga), Zheng Ji-Wena), Shao Gui-Fanga)†, Fan Tian-Ea), Wen Yu-Huab)
       
The segregation behavior at surface with respect to different Pt concentrations for six nanoparticles in Fig.  2 . (a) Variation of surface Pd fraction. (b) The degree of surface segregation for six nanoparticles.