Laser radiation-induced effects in Raman spectra of multiwalled carbon nanotubes

Jarosław Judek 1Cezariusz Jastrzebski 1Wojciech Gębicki 1Artur Małolepszy 2Marta Mazurkiewicz 2Grzegorz Słowiński 3Leszek Stobinski 2,4

1. Warsaw University of Technology, Faculty of Physics, Koszykowa 75, Warszawa 00-662, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
3. Warsaw University of Technology, Functional Materials Research Center, Wołoska 141, Warszawa 02-507, Poland
4. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Warszawa 01-224, Poland

Abstract

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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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium I, by Jarosław Judek
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-23 18:43
Revised:   2009-06-07 00:48
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