Carbon nanotubes are interesting objects for scientific investigations not only due to their unique physical properties but also due to the importance of theirs potential applications, e.g., in materials science, chemistry and physics. In this area, functionalized multiwalled carbon nanotubes (MWCNTs) are particularly interesting because they create a good compromise between their price and physicochemical properties. However, fabrication, purification and modification of well dispersible MWCNTs is arduous and sensitive to process details, thus fast and reliable method of their characterization is required. Raman spectroscopy proved to be convenient and useful method for MWCNTs characterization. However, the correct Raman spectra acquisition might be quite tricky. The absorption of laser radiation leads to significant sample heating during the measurement procedure. The temperature effect influences the Raman peak position and can shift it in a similar way as chemical sample functionalization. The coexistence of these two different effects can develop a lot of doubts in a spectra interpretation. Moreover, the laser radiation can chemically modify “as prepared” or functionalized carbon nanotubes. Two different contributions can take place. Firstly, heating can induce the carbon nanotubes transformation1. Secondly, the laser radiation can activate a chemical (and/or photochemical) reaction of functionalized MWCNTs. All these processes can modify the MWCNTs Raman spectra. In our presentation we will try to separate all these effects providing the correct Raman spectra interpretations.

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