Dear Ankur,

this depends on the thickness, the structure and the coverage of your shell material.

XPS provides a maximum analysis depth of ~10 nm, so the shell thickness should be less than this to receive signals from the underlying material.

On the other hand, a porous shell structure or incomplete surface coverage on the core material could also result in signals from the core.

Best regards,

Robert

Hi

Keep in mind XPS is a surface analysis, you can perform etching that may remove about 3 nm of the surface to go deeper inside the sample but still, so my recomendation is to include XRD and EDS analysis