A visible light-driven plasmonic photocatalyst

By Francesca Pincella, Katsuhiro Isozaki, K. Miki. Light: Science & Applications, 2014

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We demonstrate a bottom-up approach to fabricating a visible light-driven titania photocatalyst device bearing an embedded two-dimensional (2D) array of gold nanoparticles (AuNPs) as a near-field light-generating layer. The device is a layered structure prepared by depositing a 2D array of AuNPs on a transparent conductive substrate (10 nm indium tin oxide (ITO) layer on quartz), coating the 2D array of AuNPs with a monolayer of trimethoxyoctylsilane (TMOS), and depositing titania nanocrystals on the anchoring molecule (TMOS) layer. The visible light activity of the device was tested using photocatalytic degradation of methylene blue (MB) by illuminating the device with visible light (700 nm light) and ultraviolet (UV) light (250–380 nm). The localized surface plasmon resonance peak of the 36 nm AuNP 2D array is around 700 nm with a full-width at half-maximum of 350 nm. In comparison with other control samples, the device showed the highest photocatalytic activity with visible irradiation, which was 1.7 times higher than that of titania with UV irradiation. The origin of the visible light activity was confirmed by both quadratic incident light power dependency and action spectrum to be plasmon-induced (near-field enhancement by AuNPs) two-photon absorption. Researchers in Japan have developed a visible-light-driven photocatalyst by exploiting the plasmonic properties of gold nanoparticles. Francesca Pincella and co-workers fabricated the photocatalyst by depositing a two-dimensional array of gold nanoparticles on top of a transparent conductive substrate of indium-tin-oxide-coated quartz. They then covered the gold nanoparticles with a monolayer of trimethoxyoctylsilane, which acts as an anchoring agent for the final layer of titania nanocrystals. Experiments involving the photocatalytic breakdown of methylene blue under visible (700 nm) and ultraviolet (250–380 nm) light suggest that operation is considerably superior to that of conventional titania photocatalysts. The performance in the visible region is attributed to two-photon absorption, which is boosted by the plasmon resonance and near-field enhancement of the gold nanoparticles.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/35553bbcadeb34e2580a9159ff9867800ded159d