Hello.
Thanks for your consideration to see my question.
Recently, I conducted XPS anaylsis of g-CN that is prepared from thermal polycondensation of DCDA, so-called conventional bulk-g-CN, through the analysis center in my university. The operator said that whole spectrum of High-resolution N 1s XPS is shifted ~5 eV or even higher to conventional values, i.e., start the peak at >405 eV. FYI, N 1s XPS of the conventional g-CN appears at 398 or 399 eV. Operator also has no idea about this symptoms. Here I asked to the someone who is in expert for XPS analysis to confirm the possible reason of this symptom.
When conducting survey scan, it seems that whole peaks are in good position (not strict). After that, during the high-resolution XPS measurement, spectrum of N 1s and S 2p shift to higher values above 5 eV, even though the C 1s is set to 284.6 eV as a reference signal of carbon tape. I think there is minor possibility of carbon-tape induced confusion in reference C 1s peak because g-CN has high C 1s XPS peak at ~288 eV, which makes difficult to distinguish this peak to reference signal, however, 5 eV or even higher shift in N 1s and S 2p XPS is hard to understand.
Since both peaks are shifted by about the same value to higher energies, this sounds like a charging problem with a wrong referencing to me.
Definitely changing effects from what youve said. If shifting higher suggests that probably a non-monochromatic source was used?
Surprised the operator didnt know the reasons, these are fundamentals of XPS.d
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