Plasmonic gold–silver alloy on TiO2 photocatalysts with tunable visible light activity

•Visible light response of Au–Ag alloy on TiO2 photocatalysts can be well predicted.•The visible light response is accurately tunable through the alloy composition.•Photocatalytic stearic acid degradation is achieved under 490nm LED illumination.•Highest FQE is obtained when plasmon resonance matche...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2014-09, Vol.156-157, p.116-121
Main Authors: Verbruggen, Sammy W., Keulemans, Maarten, Filippousi, Maria, Flahaut, Delphine, Van Tendeloo, Gustaaf, Lacombe, Sylvie, Martens, Johan A., Lenaerts, Silvia
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Chemistry
Exact sciences and technology
General and physical chemistry
Gold
Material chemistry
Photocatalysis
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Silver
Stearic acid
Surface plasmon resonance (SPR)
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium dioxide (TiO2)
Visible light
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Summary:•Visible light response of Au–Ag alloy on TiO2 photocatalysts can be well predicted.•The visible light response is accurately tunable through the alloy composition.•Photocatalytic stearic acid degradation is achieved under 490nm LED illumination.•Highest FQE is obtained when plasmon resonance matches incident light wavelength. Adaptation of the photoresponse of anatase TiO2 to match the solar spectrum is an important scientific challenge. Modification of TiO2 with noble metal nanoparticles displaying surface plasmon resonance effects is one of the promising approaches. Surface plasmon resonance typically depends on chemical composition, size, shape and spatial organization of the metal nanoparticles in contact with TiO2. AuxAg(1−x) alloy nanoparticles display strong composition-dependent surface plasmon resonance in the visible light region of the spectrum. In this work, a general strategy is presented to prepare plasmonic TiO2-based photocatalysts with a visible light response that can be accurately tuned over a broad range of the spectrum. The application as self-cleaning material toward the degradation of stearic acid is demonstrated for a plasmonic TiO2 photocatalyst displaying visible light photoactivity at the intensity maximum of solar light around 490nm.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2014.03.027