Abstract
The polyester fabrics were modified with Ag-Ag2O-TiO2 coating. The TiO2 layer was prepared by DC magnetron sputtering and oxidation in air: a method which avoids the problem of Ti target poisoning in reactive sputtering. The Ag2O layer was deposited by DC reactivesputtering. As a contrast, the TiO2 layer of Ag-Ag2O-TiO2 coating was also prepared using radio frequency(RF) reactivesputteringin Ar/O2 gas mixture. The surface photovoltage (SPV) spectrum and the measured work functions of samples indicate that a built-in electric field was formed at the interface between Ag2O layer and TiO2 layer. The photocatalytic efficiency was analyzed through monitoring the degradation of RhodamineB (RB) under UV illumination. Compared to the polyester merely coated with TiO2, the polyester fabrics coated with Ag-Ag2O-TiO2 showed the superior performance of photocatalysis, indicating the Ag2O/TiO2 heterojunction contributes to photocatalytic degradation of RB. Results also show that the TiO2 layer in Ag-Ag2O-TiO2 coating prepared by DC magnetronsputtering and then natural oxidation had comparable photocatalytic activities with that prepared by RF reactive sputtering.
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