Nickel nanoparticles were prepared, and when preparing nickel chloride was used in addition to hydrazine and other materials
When examining the obtained nanoparticles by XPS , chlorine and nitrogen appeared on the surface of nickel NPs.
what does that mean??
#chemistry
#nanoparticles
#nickel_nanoparticles
#nickel
#XPS
#X-ray_photoelectron_spectroscopy
Well, if your starting educts were chloride and hydrazine, the presence of Cl and N is not that surprising. Both are counterparts that Nickel likes and if the reaction you are performing is only mildly nonquantitative, it is quite logical that you will observe some remainders of these.
Jürgen Weippert
Thank you very much for the answer
Does this mean that the reducing of nickel chloride by hydrazine hydrate is incomplete?
Mohsen Alsultan
Sorry I'm late to the party.
I had seen similar things when preparing supported Pd and Pd alloy catalysts back in the 1970's from chloride precursors and hydrazine hydrate reduction. Intractable chlorine species is left on the support (most likely) or associated with the metal. I do not believe that this is due to inadequate reduction as the species is not removed by multiple washing in DI water. Attempts to make 5% loaded catalysts invariably led to final amounts around 4.5% and I suspect that this was due to (colloidal) removal in the washing stage of the additional metal by reduction in the liquid outside. You could try H2 reduction as an alternative. Intractable N was also present especially in systems with nitrate precursors (as expected!).
These species are easily seen in XPS as they're pulled to the surface by chemisorption induce segregation and thus minimization of Gibbs Free Energy.
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