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(Au@Ag)@Au double shell nanoparticles loaded on rutile TiO2 for photocatalytic decomposition of 2-propanol under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45241 46407 2016 8 PDF Available
Title
(Au@Ag)@Au double shell nanoparticles loaded on rutile TiO2 for photocatalytic decomposition of 2-propanol under visible light irradiation
Abstract

•(Au@Ag)@Au nanoparticles were synthesized for utilization as photosensitizers of TiO2.•(Au@Ag)@Au/TiO2 can oxidize 2-propanol into acetone and CO2 under visible light irradiation.•Photocatalytic reaction process of (Au@Ag)@Au/TiO2 is proposed.

We synthesized (core@shell)@shell ((Au@Ag)@Au) nanoparticles (NPs) by a multistep citrate reduction method for utilization as photosensitizers of TiO2. The (Au@Ag)@Au NPs exhibited strong photoabsorption in visible light response due to LSPR excitation of the Ag shell, and its LSPR characteristics were stable under visible light irradiation for a long time because oxidation of the Ag shell was prevented by the outermost Au shell. Furthermore, we successfully loaded (Au@Ag)@Au NPs on rutile TiO2 by an impregnation method. (Au@Ag)@Au/TiO2 could oxidize 2-propanol into acetone and CO2 under visible light irradiation (λ > 440 nm), and its acetone evolution rate was approximately 15-times higher than that of Au/TiO2. From a comparison of action spectra for acetone evolution and the Kubelka–Munk function, it was confirmed that photocatalytic activity of (Au@Ag)@Au/TiO2 was induced by photoabsorption based on LSPR excitation of the Ag shell. In addition, photoelectrochemical measurements revealed electron injection from LSPR-excited (Au@Ag)@Au NPs into TiO2 under visible light irradiation. We proposed the photocatalytic reaction process of (Au@Ag)@Au/TiO2 in conjunction with optical, structural and photoelectrochemical properties.

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Keywords
Photocatalyst; Titanium oxide; Visible light-responsive photocatalyst; Localized surface plasmon resonance
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(Au@Ag)@Au double shell nanoparticles loaded on rutile TiO2 for photocatalytic decomposition of 2-propanol under visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 255–262
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us