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Catalysts 2013, 3(3), 625-645; doi:10.3390/catal3030625
Article

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

1,2
, 3
, 3,4
 and 2,3,*
Received: 10 May 2013; in revised form: 24 June 2013 / Accepted: 19 July 2013 / Published: 31 July 2013
(This article belongs to the Special Issue Photocatalysts)
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Abstract: The Ag-nanoparticles (Ag-NP)/TiO2 composite thin films with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) were examined as a potential photocatalyst by decoloration reaction of methylene blue (MB) in an aqueous solution. These composite thin films of ca. 100 nm thickness were fabricated by the MPM at 600 °C in air. The decoloration rates monitored by the absorption intensity of the MB solution indicated that the composite thin films of Ag with an amount less than 40 mol% are not effective under vis-irradiation, though they can work as a photocatalyst under UV-irradiation. Further, the UV-sensitivity of the composite thin films gradually decreased to almost half the level of that of the TiO2 thin film fabricated under the identical conditions when the Ag amount increased from 10 to 40 mol%. Contrarily, the composite thin films of Ag content larger than 50 mol% showed the vis-responsive activity, whose level was slightly lower than the decreased UV-sensitivity. Diffuse reflectance spectra suggested that the vis-responsive activity of the composite thin films is due to the conductivity, localized surface plasmon resonance and surface plasmon resonance of Ag-NP. It was also elucidated that the vis-responsive level of the composite thin films corresponds to their electrical conductivity that depends on the Ag content.
Keywords: photocatalyst; Ag NP; molecular precursor method; methylene blue; surface plasmon photocatalyst; Ag NP; molecular precursor method; methylene blue; surface plasmon
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Daniel, L.S.; Nagai, H.; Yoshida, N.; Sato, M. Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM). Catalysts 2013, 3, 625-645.

AMA Style

Daniel LS, Nagai H, Yoshida N, Sato M. Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM). Catalysts. 2013; 3(3):625-645.

Chicago/Turabian Style

Daniel, Likius S.; Nagai, Hiroki; Yoshida, Naoya; Sato, Mitsunobu. 2013. "Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)." Catalysts 3, no. 3: 625-645.


Catalysts EISSN 2073-4344 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert