
1.Polymer Materials Unit, National Institute for Materials Science, Ibaraki 305-0044, Japan
2.Department of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan
3.Current address: International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan
Dr K Isozaki, International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Gokasyo, Uji, Kyoto 611-0011, Japan Email: kisozaki@scl.kyoto-u.ac.jp
KM, Polymer Materials Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan Email: MIKI.Kazushi@nims.go.jp
Published:2014-03,
Published Online:17 January 2014,
Received:16 June 2013,
Revised:05 September 2013,
Accepted:21 September 2013
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Pincella, F., Isozaki, K. & Miki, K. A visible light-driven plasmonic photocatalyst. Light: Science & Applications, 3, e133 (2014).
Pincella, F., Isozaki, K. & Miki, K. A visible light-driven plasmonic photocatalyst. Light: Science & Applications, 3, e133 (2014). DOI: 10.1038/lsa.2014.14.
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.
gold nanoparticlesnear-field lightplasmonicstwo-photon absorptionvisible photocatalysis
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