A visible light-driven plasmonic photocatalyst View Full Text


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Article Info

DATE

2014-01

AUTHORS

Francesca Pincella, Katsuhiro Isozaki, Kazushi Miki

ABSTRACT

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. More... »

PAGES

e133

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/lsa.2014.14

DOI

http://dx.doi.org/10.1038/lsa.2014.14

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004907406


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