Abstract
ZnO/Ag multi-phase composited TiO2 nanotube arrays (TiO2 TNAs) films were prepared on pure Ti substrate through one-step anodizing method using double pulse plating power supply. The deposition amount of Ag and ZnO were adjusted by changing the concentration of Zn(NO3)2·6H2O and AgNO3 and reverse voltage. The results showed that ZnO deposited in the wall of TiO2 NTAs dispersedly; sedimentary phase and dispersed phase are the two forms of deposited Ag in TiO2 NTAs. The bandgap narrowed 0.33 eV, and the recombination rate of photo-generated electron-hole pairs also decreased obviously due to the doping energy level synergistic effect of ZnO and the Surface Plasmon Resonance (SPR) effect of Ag. Furthermore, the sample with 1 mM ZnO+0.4 mM Ag and 5 V reverse voltage has the best photocatalytic properties, the degradation rate of Methylene blue (MB) reached 86% which improved 15% compared with undoped TiO2 NTAs.
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