Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO2 nanoparticles via wet chemical method. For this purpose tetra chloride titanium (TiCl4) was used as titanium source. MWCNTs were exposed at dif-ferent amount of TiCl4 (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 TiO2 at short term immersion. Increasing soaking time caused to fill the MWCNTs with TiO2 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 TiO2 was more noticeable at large amount of TiCl4. XRD results revealed that the crystalline structure of TiO2 on the surface and inner of MWCNTs was rutile. The average size of TiO2 nanoparticles which modified MWCNTs were 20 nm.

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