Quantitative Analysis of Diameter Dependent Properties of Multi-walled Carbon Nanotubes

Singh, Dilip K.; Iyer, Parameswar K.; Giri, P. K.
June 2009
AIP Conference Proceedings;6/29/2009, Vol. 1147 Issue 1, p450
Academic Journal
Several exotic properties of Multiwalled carbon nanotubes (MWCNTs) can not be understood without the knowledge of average diameter distribution. Optical spectroscopy techniques have not been exploited much for studying MWCNTs. In this work, we use X-ray diffraction (XRD) and Raman spectroscopy as tools to study diameter distribution of MWNTs. Raman studies on the MWNTs show diameter dependence of G-band, with relative change in intensity of the metallic and semiconducting component of the G-band as a function of diameter. Diameter dependence of line shape in XRD pattern and Raman spectra is discussed in terms of lattice strain and atomic vibrations involving interaction among the walls in MWNTs. Electron paramagnetic resonance studies shows a Gaussian component whose g-value approaches free electron g-value with increasing diameter. Oxidation temperature is found to depend on diameter of MWCNTs by Thermogravemetic experiments.


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