I have been asked to use the 284.8eV peak in the C1s narrow scan as the reference peak for fitting all other potential peaks for a carbon material. Also, which fitting optimization parameters yield the mixed Donjiach-Sunjik, simplex sum or Powel sum? Thank you in advance
Hello Pasquale F Fulvio,
Generally, if your material does not have carbon content, you can take 284.8 eV, i.e., adventitious carbon, as the reference for nullifying the charge shifting in all the elements. However, there is broad discussion over C1s referencing; however, if there is no carbon content in the sample, you can use C 1s referencing for your sample.
C1s referencing can predict wrong results when your material has carbon content. e.g., for graphene, the C1s peak is below 284.5 eV, then if you fit using 284.8 eV, you will end up getting the wrong results. In these cases, you can use Gold referencing (deposited in contact with your sample so that they are in the same potential condition).
Regards,
Nitish
Hello Nitish,
Thank you for your response. My material is a porous carbon; it is doped with N and has ~5wt% O. It seems that the 284.8eV is used as a reference for assigning all other carbon peaks containing C-N, CO, etc. Should we expect charge shifting when using the ion gun for the entire measurement? Any suggested papers are highly appreciated. Best,
Pasquale
The C1s adventitious carbon method is, rightfully, under heavy criticism since it is rather likely that it's a source of inaccuracy and not an actual correction.
If you had your neutralizing ion gun on during the measurement, applying no binding energy shift at all is probably the best idea.
I just found a couple of Greczynski's papers on the subject. Thank you for all the responses.
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