I have a coating with 2 different layers (Al and Zn). After a process under temperature, I want to evaluate the presence of ZnAl2O4 among other oxides (mainly Al2O3 and ZnO). Is possible to confirm the presence of ZnAl2O4 by XPS?? Any difference in the binding energies can be appreciated???
Thanks a lot for your comments and help.
Both intuitively and building on what I just found on NIST: no.
Al2p in ZnAl2O4 is at 74.0eV while Al2O3 is in the range 73.8-74.7eV:
https://srdata.nist.gov/xps/EngElmSrchQuery.aspx?EType=PE&CSOpt=Retri_ex_dat&Elm=Al
Zn3s is at 139.8eV both for ZnAl2O4 and ZnO
https://srdata.nist.gov/xps/EngElmSrchQuery.aspx?EType=PE&CSOpt=Retri_ex_dat&Elm=Zn
Intuitively that is the expectation becauso you have identical oxidation states and identical counterions.
Hi Marisa Rico-Santacruz ,I think it is not easy to differentiate,
However, you can measure your references for both of them and then compare. If you can, it would be great to obtain the XPS spectra in operando for different temperature while it is growing. You may see some evolution.
Jürgen Weippert and Roman Fiala thanks so much for answer!!! I found a paper that could help me on that, I enclose you in case you want to know a little more about the topic:
Article Preparation and surface characterization of zincated alumini...
Marisa
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