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Covalent modification of multi-walled-nanotube (MWNT) surface-enhanced solubility in water yields a thin transparent shining dark-coloured film of soluble MWNT (s-MWNT) with a conductivity of 1.25S/cm. Fourier transform infrared spectroscopy, scanning electron microscopy, transmission-electron microscopy, and UV-vis absorption spectroscopy were used for thefilm characterization. The result shows that enhanced interactions between s-MWNT and water and between s-MWNTs play an important role in increasing the solubility of the nanotubes in water and in the formation of uniform thin films.