In a seed mediated process or two steps synthetic approach using Au NPs as seeds, it has been found that Pd forms ideal shell on Au core. But Pt NPs at the exterior of Au core are present as spongy nature. Pt NPs are rather deposited on Au instead of their layer by layer growth like Pd case. This observation is found in most of the cases. Is there any specific reason for such phenomenon?
Please provides references if you have.
Thanking you.
Surface segregation/mixing energy is affected by core electrons and is different for Au-Pd and Au-Pt systems (by about 20%, which may explain the observed differences). See Ruban et al. (1999) Phys.Rev.B 59 (24) p 15990 for comparisons of calculations and experimental data
Surface segregation/mixing energy is affected by core electrons and is different for Au-Pd and Au-Pt systems (by about 20%, which may explain the observed differences). See Ruban et al. (1999) Phys.Rev.B 59 (24) p 15990 for comparisons of calculations and experimental data
Core shell formation depends on the surface energy, electro negativity and electron density between the two metals. The Metal with lower surface energy will form the shell and the higher one will form core.
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