The size of TiO2 nanoparticles (Fig. 1) was determined through Scanning Tunneling Microscope (STM) in Central Laboratory of Ferdowsi University of Mashhad. X-ray diffraction (XRD) pattern of nanoparticles TiO2 was shown in Fig. 2. XRD measurement showed that the TiO2 nanoparticles used in the study were made by 80% anatase and 20% rutile