Milton Franklin Benial A*, CMS Anandhi
In this study, the oxidized Multi Walled Carbon Nanotubes (MWCNTs) were functionalized with the simplest essential amino acid L-Leucine by ultra-sonication process. The structural, optical, morphological and vibrational characterizations of oxidized and L-leucine Functionalized MWCNTs (FMWCNTs) were carried out by X-Ray Diffraction (XRD), Ultraviolet-Visible Spectroscopy (UV-Vis), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray analysis (EDX), Fourier Transform Infrared (FTIR) spectroscopy Raman spectroscopy and Electron paramagnetic resonance spectroscopic techniques. The observed spectral features like peak position, intensity, diameter of the nanotubes, crystallinity, were investigated. The various spectral results confirm the successful functionalization of the L-leucine on the outer surface of the MWCNTs. The shift and the broadening of peak in the XRD pattern indicate that the incorporation of L-leucine decreases the crystalline nature. FTIR study confirms the presence of functional groups in oxidized MWCNTs and F-MWCNTs. Raman studies reveals that the functionalization rate is increased due to the higher relative intensity ratio of the FMWCNTs. EPR study revealed that the EPR absorption data found to be best fit for the Gaussian line shape. The g-value indicates that the system was found to be isotropic in nature. These spectroscopic investigations may lead to the enhancement of the biocompatibility of the f-MWCNTs, which may be useful for further chemistry with various biomolecules in the field of biomedicine and targeted drug delivery.
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