When a transition metal is deposited on the surface of a different metal to synthesize core-shell nanoparticles, chemical properties of the shells will be modified by electronic interactions at the bi-metallic surface. I notice that if electrons flow from the shell to the core, the bonding strength between adsorbates and the outer surface of the shell will be weakened.
Is anybody know why the bonding strength decreases when the shell has less electron density?
Thank you very much!
I think your observation may not be a general rule and it depends on the tested adsorbate. If the adsorbate is electrophile then the flow of electrons from the shell to the core will weaken it's interaction with the metals on the surface. On the other hand, if the adsorbate is nucleophile this electron flow should enhance its interaction with the shell. Have you studied various adsorbate s?
Mohammad Kooti
The adsorbate I am going to study is H+ and CO2, so I think they are electrophile. Thank you so much for your answer, Mr. Kooti! Everything makes sense now.
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