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25 October 2018 In-situ characterization of surface-plasmon-enhanced photocatalysis of Ag decorated black TiO2 by IR-AFM
Lili Shi, Yanling He, Jiahui Peng, Jingyang Lin, Jiaxing Li, Keji Shi, Alan Man Ching Ng
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Proceedings Volume 10823, Nanophotonics and Micro/Nano Optics IV; 108231A (2018) https://doi.org/10.1117/12.2500706
Event: SPIE/COS Photonics Asia, 2018, Beijing, China
Abstract
TiO2 thin film photocatalysis has suffered from poor photocatalytic efficiency due to its low surface area-to-volume ratio. The efficiency can be enhanced by narrowing the bandgap, defect engineering or introducing surface plasmonic effect. However, the fabrication process is normally complicated and time consuming. This work offers a simple method to fabricate disordered defect-rich black TiO2 ultrathin film by atomic layer deposition (ALD). Surface defects of TiO2 have been suggested to play a significant role in the process of photocatalysis. With ALD, the bandgap and surface defects of the material can be controlled effectively through the deposition parameters. Surface plasmonic effects could also be introduced by the deposition of Ag nanoclusters via simple thermal evaporation. Absorption at ~450 nm was significantly enhanced. The overall photocatalytic behavior of composite material is greatly boosted and we observed an excellent efficiency towards the degradation of organic pollutants such as bisphenol A. The mechanism of surface plasmonic enhanced black TiO2 photocatalysis was studied by in-situ infrared atomic force microscope (IR-AFM) under the illumination of different wavelength. The reaction sites of the composite materials were determined accurately and the working mechanism was discussed.
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Lili Shi, Yanling He, Jiahui Peng, Jingyang Lin, Jiaxing Li, Keji Shi, and Alan Man Ching Ng "In-situ characterization of surface-plasmon-enhanced photocatalysis of Ag decorated black TiO2 by IR-AFM", Proc. SPIE 10823, Nanophotonics and Micro/Nano Optics IV, 108231A (25 October 2018); https://doi.org/10.1117/12.2500706
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KEYWORDS
Photocatalysis
Atomic layer deposition
Absorption
Chemical analysis
Infrared spectroscopy
Plasmonics
Titanium dioxide
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