研究目的
Investigating the plasmonic and non-plasmonic contributions of Au nanoparticles to the photocatalytic activity of TiO2 thin films under mixed UV–visible light.
研究成果
The study demonstrates that the ratio of visible to UV light intensities significantly affects the photocatalytic performance of Au-TiO2 hybrid structures, with an optimal Vis/UV ratio of 0.24/1 for maximum enhancement. Beyond this ratio, further increases in visible light intensity do not improve performance, possibly due to increased electron-hole recombination.
研究不足
The study focuses on immobilized thin films rather than colloidal systems, which may limit the generalizability of findings to other forms of TiO2. The effect of very high Vis/UV ratios on photocatalytic performance was not explored in depth.
1：Experimental Design and Method Selection:
The study involved the preparation of TiO2 thin films by DC reactive magnetron sputtering and the photocatalytic deposition of Au nanoparticles on these films. The photocatalytic activity was evaluated under different ratios of visible to UV light intensities.
2：Sample Selection and Data Sources:
Silicon and quartz substrates were used for the deposition of TiO2 thin films. The photocatalytic activity was assessed by the degradation of methylene blue (MB) solution under UV and visible light irradiation.
3：List of Experimental Equipment and Materials:
SEM for surface morphology, XPS for chemical composition, UV-Vis spectrometer for optical absorbance properties, and UV-Vis spectrophotometer for monitoring MB degradation.
4：Experimental Procedures and Operational Workflow:
TiO2 thin films were prepared, decorated with Au NPs via photocatalytic deposition, and their photocatalytic performance was tested under varying light conditions.
5：Data Analysis Methods:
The photocatalytic activity was analyzed by monitoring the change in MB solution absorption at 664 nm.
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