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

[Display omitted] •(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 ((A...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2016-01, Vol.180, p.255-262
Main Authors: Kamimura, Sunao, Miyazaki, Takeshi, Zhang, Ming, Li, Yuqing, Tsubota, Toshiki, Ohno, Teruhisa
Format: Article
Language:English
Subjects:
Localized surface plasmon resonance
Photocatalyst
Titanium oxide
Visible light-responsive photocatalyst
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Summary:[Display omitted] •(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>440nm), 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.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2015.06.037