I've seen FT-IR spectra of Iron oxide nanoparticles and in many of them peaks at 2854 and 2926 which corresponds to C-H stretching is coming, they haven't coated iron oxide with anything. Can anyone tell me the reason for this? I find FT-IR spectra of Iron oxide very complicated, it should show peaks corresponding to Fe-O bond and water molecules, no other peaks should come but this is not the case, many other peaks appear in the spectra and there is not much plausible explanation given for it in literature.
NIST FT-IR Fe2O3 Ferric Oxide (Pure Red Oxide), solid(0.8 mg / 300 mg CsI pellet) have the low-intensity band at approximately 3460 cm-1 can be assigned to the structural -OH to the presence of water traces. FT-IR have not band 2854 and 2926 cm-1 .Your 2854 and 2926 cm-1 appear as a result of "wet "synthesis. If the oxide is calcined there will be no band of CH groups.
Best regards.
NIST FT-IR Fe2O3 Ferric Oxide (Pure Red Oxide), solid(0.8 mg / 300 mg CsI pellet) have the low-intensity band at approximately 3460 cm-1 can be assigned to the structural -OH to the presence of water traces. FT-IR have not band 2854 and 2926 cm-1 .Your 2854 and 2926 cm-1 appear as a result of "wet "synthesis. If the oxide is calcined there will be no band of CH groups.
Best regards.
In other words, following Yuri Mirgorod's answer, your sample might have been contaminated during synthesis or preparation/handling for FTIR. If no other peaks are observed in the 2000-2500 cm-1 range (where contributions from COx uptake should appear), I would consider a possible contamination during the NP synthesis. Another possibility is the sample support during FTIR, in case you have unevenly deposited the NP on a carbon-based or carbon-contaminated plate (only if you performed FTIR on Solid sample, which is not clear from your question)
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