Abstract: In this paper, pure rutile Sn-doped TiO2 nanocrystals were synthesized by hydrothermal method, with TiCl3 and SnCl4 aqueous solutions as the precursor, at 180℃ for 24h. When the ratio of Ti3+/Sn4+ in the precursor solution was 4:1, EDS spectra show that the atomic percent concentration of the doped-Sn4+ in the synthesized rutile TiO2 nanocrystals was 1;. When the ratio of Ti3+/Sn4+ was changed to 1:1 ,the atomic percent concentration of doped-Sn4+ was up to 2.8;. It's indicate that it is hard for Sn atoms to dope into the lattices of rutile TiO2 nanocrystals by the way of lattice- substituting.

Key words: In this paper, pure rutile Sn-doped TiO2 nanocrystals were synthesized by hydrothermal method, with TiCl3 and SnCl4 aqueous solutions as the precursor, at 180℃ for 24h. When the ratio of Ti3+/Sn4+ in the precursor solution was 4:1, EDS spectra show that the atomic percent concentration of the doped-Sn4+ in the synthesized rutile TiO2 nanocrystals was 1;. When the ratio of Ti3+/Sn4+ was changed to 1:1 ,the atomic percent concentration of doped-Sn4+ was up to 2.8;. It's indicate that it is hard for Sn atoms to dope into the lattices of rutile TiO2 nanocrystals by the way of lattice- substituting.