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Multiwalled Carbon nanotubes (MWCNTs) were covalently functionalized by H2SO4/HNO3 treatment to produce Carboxylated Multiwalled Carbon nanotubes (MWCNTR). Presence of carboxyl moieties on MWCNT were confirmed by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Thermo gravimetric analysis (TGA).
