I have samples of 1% of Al doped LiNiCoTiO2 cathode materials. Wide scan of XPS shows the existing of Al element in Al doped cathode materials but narrow scan does not show any noticeable peak regarding on Al element. Why does this happen?
please provide some more details. What kind of X-ray source are you using? What are the details of the acquisition for both scans (identical pass energies and operation modes of the spectrometer)? Can you supply the data, at least those for the survey scan (wide scan)?
In case of a non-monochromatized X-ray source, you may have a superposition of a satellite peak of the source and a different transition with the Al2p and Al2s signals - by the way, are both detectable in the survey scan, or only ONE of them?
Dear Dirk, Attach here are the details for a wide scan and narrow scan result for 1% of Al doped LiNiCoTiO2. It seems that in wide scan, the Al 2p peak position is near to Ni 3p peak. Al monochromator was used as X-ray source with pass energy of 280 eV and 112 eV for wide and narrow scan respectively.
As your Al content is very small, it generally happens that in wide scans the peak shows up easily whereas in narrow regions it does not show easily. You have to spend more time to get reasonable signal. As you can see your noise level is pretty high in your Al 2p narrow region, You should take more no. of scans to get Al peak.
As pointed out in the earlier answer - if there is Al in your sample you should see BOTH Al 2p and Al 2s peaks in the survey scan. Al 2s should appear at around 118-120 eV and the intensity should be similar to the Al 2p peak. I do not see that signal in the survey scan so my conclusion is that Al is not detectable.