Can you explain the low binding energies in the table? Thank you very much for your support in advance.
Dear Oral laçin ,
It is hard to say anything precisely without complete knowledge on samples, substrate on which it is deposited, calibration method, spectra (both survey and high resolution), and further processing done on the samples (if any).
kind regards,
Pitambar
Apart from carbides (which are not present in your cases, of course), there is a couple of possible explaination in my opinion:
1. there is a large fraction of Csp2-Csp3 boundary defects forming localized clusters ( see for example Article Origins of sp(3)C peaks in C-1s X-ray Photoelectron Spectra ...
)2. there has been some problem in peaks assignment due to charging.
It may help knowing how have you aligned the BE axis (to the Fermi level) of each spectrum
We observed a similar component arising when we treated Coronene with atomic oxygen in fig. 5 of
Article Formation of Sublimable Nanographene Oxides by Reacting Coro...
According to the References
Article Initial Stages of Oxidation on Graphitic Surfaces: Photoemis...
Article Atomic Oxygen on Graphite: Chemical Characterization and The...
these components can be assigned to carbon atoms adjacent to the carbon atoms directly interlinked by an epoxy species.
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