Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO 2 nanoparticles via wet chemical method. For this purpose tetra chloride titanium (TiCl 4 ) was used as titanium source. MWCNTs were exposed at different amount of TiCl 4 (0.25 and 0.1 ml) and different soaking times. The modified MWCNTs have been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM results showed that the MWCNTs were fully decorated with TiO 2 at short term immersion. Increasing soaking time caused to fill the MWCNTs with TiO 2 nanoparticles. The results showed that the amount of precursor had a significant role on quantity of decoration. The decoration of outer surface of MWCNTs with TiO 2 was more noticeable at large amount of TiCl 4 . XRD results revealed that the crystalline structure of TiO 2 on the surface and inner of MWCNTs was rutile. The average size of TiO 2 nanoparticles which modified MWCNTs were 20 nm.
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