The diagram shows Raman spectra (measured with a blue diode laser at 473 nm) of carbonized polyacrylonitrile (PAN) nanofibers. The fibers were in contact with different metal surfaces during carbonization in nitrogen atmosphere. I wanted to analyze the D and G band intensities but noticed these sharp double peaks at 1000/1040 cm-1 and 1580/1600 cm-1. Can anyone tell me where these peaks are coming from?
It may be lines from the products of decomposition of PAN nanofibers. PAN fibers have sharp bands at 1456 cm-1 and 2243 cm-1. If you send me spectra, I’ll take a look. The band close to 1000 cm-1 may be aromatic compounds as polystyrene has a strong and sharp Raman band at 1004 cm-1. The easy way is to remove background and D/G bands and run a search over the Raman library.
My thoughts are along the same lines a Sergey. Bands at ~1000 and 1600 cm-1 Raman shift are consistent with aromatic compounds. Could these come from the sample processing or the way they are mounted in the spectrometer?
Thank you a lot for your suggestions. The peaks indeed originate from polystyrene as the laser went through the fiber mats and measured in part the plastic petridish below...
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