From Fig. 2-2 (b), it can be seen that TiO2, TiO2-SnO2 and tio2-ato have no obvious characteristic absorption peaks of carbon containing groups. It can also be proved that there is no me-o-c fitting peak in the C 1s photoelectron spectra of TiO2, TiO2-SnO2 and tio2-ato samples prepared from Fig. 2-3.<br>
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