Hi,

I think if both parts of your nanoparticle contain metallic elements you must use UPS or XPS analysis separately for each part. However, it is better to use TEM micrographs for decorated and non-decorated samples because UPS shows you elemental analysis and oxidation state of the elements.

Just from the data, you can't. You require some sort of modelling, e.g. a calculation of partial densities of states which allows you to differentiate. If you can measure the core and the shell seperately as Mohammad Reza Toosi suggested, do so, but I presume your nanoparticles are already formed with the core-shell structure and the parts can't be synthesized seperately, right?

Dear professor,

Thank you for your response.

First I synthesized bare (core) nanoparticle, after that the shell was decorating on the surface of the core.

This sample has taken as UPS. What I do? Suggest me.

OK, if you already have a UPS of the pure core and the core-shell system, you may try a subtraction. In order to do this, you require a spectrum with well-separated peaks. Try subtracting your secondary-free UPS of the core from the combined spectrum, then you have the shell contribution.

Otherwise you could check if both spectra resemble each other somehow so you could attribute a shift of the full spectrum to the shell.

Thank you prof. Jurgen and prof. Mohammed Reza toosi for your valuable suggestion.

I will try do this

You're welcome. But no need to call me Prof., I am just a PostDoc...