Hi, Thank you in advance for answering my questions.
I am working with a manganese dioxides material with different phase structures (α-MnO2, β-MnO2, and δ-MnO2). I am actually a bit confused regarding the peak positions of manganese oxidations states (Mn4+, Mn3+, Mn2+). I already did a scan using XPS and all of them have two peak at about BE 653 ev and 642 ev corresponding to Mn 2p 1/2 and Mn 2p 3/2. However i want to know the composition of 3 oxidation states above in each structures. I take a look at several reference paper and some of them have differences when identyifing the peak composition of Mn 2p 3/2. For example one paper said the Mn 2p 3/2 have three main consitituents 641.3, 642.5, and 644 eV which corresponds to Mn2+, Mn3+, and Mn4+, but some paper have different binding energies from this ones although similar with slight differences in binding energies. Is the slight differences is observed in many papers are normal? because i want to use the reference peak from papers to fit my xps data using peak41 software, but i am a bit confused which reference peak should i took.
Anthony Muliaji
Compare your spectra with spectra
Article The role of MnO2 crystal morphological scale and crystal str...
Dear Muliaji,
just by looking at the fits in the suggested paper, I would recommend to not use this as a reference. E.g. the FWHMs vary strongly for no apparent reason between different fits.
I would recommend the following paper, which uses well known reference samples to establish a fitting routine which also includes other peaks besides the Mn2p.
Article XPS Determination of Mn Oxidation States in Mn (Hydr)oxides
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