A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide

Koichi Awazu, Makoto Fujimaki, Carsten Rockstuhl, Junji Tominaga, Hirotaka Murakami, Yoshimichi Ohki, Naoya Yoshida, Toshiya Watanabe

Research output: Contribution to journalArticle

1145 Citations (Scopus)

Abstract

Titanium dioxide (TiO2) displays photocatalytic behavior under near-ultraviolet (UV) illumination. In another scientific field, it is well understood that the excitation of localized plasmon polaritons on the surface of silver (Ag) nanoparticles (NPs) causes a tremendous increase of the near-field amplitude at well-defined wavelengths in the near UV. The exact resonance wavelength depends on the shape and the dielectric environment of the NPs. We expected that the photocatalytic behavior of TiO2 would be greatly boosted if it gets assisted by the enhanced near-field amplitudes of localized surface plasmon (LSP). Here we show that this is true indeed. We named this new phenomenon "plasmonic photocatalysis". The key to enable plasmonic photocatalysis is to deposit TiO2 on a NP comprising an Ag core covered with a silica (SiO2) shell to prevent oxidation of Ag by direct contact with TiO2. The most appropriate diameter for Ag NPs and thickness for the SiO2 shell giving rise to LSP in the near UV were estimated from Mie scattering theory. Upon implementing a device that took these design considerations into account, the measured photocatalytic activity under near UV illumination of such a plasmonic photocatalyst, monitored by decomposition of methylene blue, was enhanced by a factor of 7. The enhancement of the photocatalytic activity increases with a decreased thickness of the SiO2 shell. The plasmonic photocatalysis will be of use as a high performance photocatalyst in nearly all current applications but will be of particular importance for applications in locations of minimal light exposure.

Original languageEnglish
Pages (from-to)1676-1680
Number of pages5
JournalJournal of the American Chemical Society
Volume130
Issue number5
DOIs
Publication statusPublished - 2008 Feb 6
Externally publishedYes

Fingerprint

Photocatalysts
Silver
Nanoparticles
Titanium dioxide
Photocatalysis
Lighting
Equipment Design
Wavelength
Methylene Blue
Silicon Dioxide
Deposits
Silica
Scattering
Decomposition
Light
Oxidation
titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Awazu, K., Fujimaki, M., Rockstuhl, C., Tominaga, J., Murakami, H., Ohki, Y., ... Watanabe, T. (2008). A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide. Journal of the American Chemical Society, 130(5), 1676-1680. https://doi.org/10.1021/ja076503n

A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide. / Awazu, Koichi; Fujimaki, Makoto; Rockstuhl, Carsten; Tominaga, Junji; Murakami, Hirotaka; Ohki, Yoshimichi; Yoshida, Naoya; Watanabe, Toshiya.

In: Journal of the American Chemical Society, Vol. 130, No. 5, 06.02.2008, p. 1676-1680.

Research output: Contribution to journalArticle

Awazu, K, Fujimaki, M, Rockstuhl, C, Tominaga, J, Murakami, H, Ohki, Y, Yoshida, N & Watanabe, T 2008, 'A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide', Journal of the American Chemical Society, vol. 130, no. 5, pp. 1676-1680. https://doi.org/10.1021/ja076503n
Awazu, Koichi ; Fujimaki, Makoto ; Rockstuhl, Carsten ; Tominaga, Junji ; Murakami, Hirotaka ; Ohki, Yoshimichi ; Yoshida, Naoya ; Watanabe, Toshiya. / A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide. In: Journal of the American Chemical Society. 2008 ; Vol. 130, No. 5. pp. 1676-1680.
@article{cc8c2d201ff44a319ede05a6b26721ff,
title = "A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide",
abstract = "Titanium dioxide (TiO2) displays photocatalytic behavior under near-ultraviolet (UV) illumination. In another scientific field, it is well understood that the excitation of localized plasmon polaritons on the surface of silver (Ag) nanoparticles (NPs) causes a tremendous increase of the near-field amplitude at well-defined wavelengths in the near UV. The exact resonance wavelength depends on the shape and the dielectric environment of the NPs. We expected that the photocatalytic behavior of TiO2 would be greatly boosted if it gets assisted by the enhanced near-field amplitudes of localized surface plasmon (LSP). Here we show that this is true indeed. We named this new phenomenon {"}plasmonic photocatalysis{"}. The key to enable plasmonic photocatalysis is to deposit TiO2 on a NP comprising an Ag core covered with a silica (SiO2) shell to prevent oxidation of Ag by direct contact with TiO2. The most appropriate diameter for Ag NPs and thickness for the SiO2 shell giving rise to LSP in the near UV were estimated from Mie scattering theory. Upon implementing a device that took these design considerations into account, the measured photocatalytic activity under near UV illumination of such a plasmonic photocatalyst, monitored by decomposition of methylene blue, was enhanced by a factor of 7. The enhancement of the photocatalytic activity increases with a decreased thickness of the SiO2 shell. The plasmonic photocatalysis will be of use as a high performance photocatalyst in nearly all current applications but will be of particular importance for applications in locations of minimal light exposure.",
author = "Koichi Awazu and Makoto Fujimaki and Carsten Rockstuhl and Junji Tominaga and Hirotaka Murakami and Yoshimichi Ohki and Naoya Yoshida and Toshiya Watanabe",
year = "2008",
month = "2",
day = "6",
doi = "10.1021/ja076503n",
language = "English",
volume = "130",
pages = "1676--1680",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "5",

}

TY - JOUR

T1 - A plasmonic photocatalyst consisting of silver nanoparticles embedded in titanium dioxide

AU - Awazu, Koichi

AU - Fujimaki, Makoto

AU - Rockstuhl, Carsten

AU - Tominaga, Junji

AU - Murakami, Hirotaka

AU - Ohki, Yoshimichi

AU - Yoshida, Naoya

AU - Watanabe, Toshiya

PY - 2008/2/6

Y1 - 2008/2/6

N2 - Titanium dioxide (TiO2) displays photocatalytic behavior under near-ultraviolet (UV) illumination. In another scientific field, it is well understood that the excitation of localized plasmon polaritons on the surface of silver (Ag) nanoparticles (NPs) causes a tremendous increase of the near-field amplitude at well-defined wavelengths in the near UV. The exact resonance wavelength depends on the shape and the dielectric environment of the NPs. We expected that the photocatalytic behavior of TiO2 would be greatly boosted if it gets assisted by the enhanced near-field amplitudes of localized surface plasmon (LSP). Here we show that this is true indeed. We named this new phenomenon "plasmonic photocatalysis". The key to enable plasmonic photocatalysis is to deposit TiO2 on a NP comprising an Ag core covered with a silica (SiO2) shell to prevent oxidation of Ag by direct contact with TiO2. The most appropriate diameter for Ag NPs and thickness for the SiO2 shell giving rise to LSP in the near UV were estimated from Mie scattering theory. Upon implementing a device that took these design considerations into account, the measured photocatalytic activity under near UV illumination of such a plasmonic photocatalyst, monitored by decomposition of methylene blue, was enhanced by a factor of 7. The enhancement of the photocatalytic activity increases with a decreased thickness of the SiO2 shell. The plasmonic photocatalysis will be of use as a high performance photocatalyst in nearly all current applications but will be of particular importance for applications in locations of minimal light exposure.

AB - Titanium dioxide (TiO2) displays photocatalytic behavior under near-ultraviolet (UV) illumination. In another scientific field, it is well understood that the excitation of localized plasmon polaritons on the surface of silver (Ag) nanoparticles (NPs) causes a tremendous increase of the near-field amplitude at well-defined wavelengths in the near UV. The exact resonance wavelength depends on the shape and the dielectric environment of the NPs. We expected that the photocatalytic behavior of TiO2 would be greatly boosted if it gets assisted by the enhanced near-field amplitudes of localized surface plasmon (LSP). Here we show that this is true indeed. We named this new phenomenon "plasmonic photocatalysis". The key to enable plasmonic photocatalysis is to deposit TiO2 on a NP comprising an Ag core covered with a silica (SiO2) shell to prevent oxidation of Ag by direct contact with TiO2. The most appropriate diameter for Ag NPs and thickness for the SiO2 shell giving rise to LSP in the near UV were estimated from Mie scattering theory. Upon implementing a device that took these design considerations into account, the measured photocatalytic activity under near UV illumination of such a plasmonic photocatalyst, monitored by decomposition of methylene blue, was enhanced by a factor of 7. The enhancement of the photocatalytic activity increases with a decreased thickness of the SiO2 shell. The plasmonic photocatalysis will be of use as a high performance photocatalyst in nearly all current applications but will be of particular importance for applications in locations of minimal light exposure.

UR - http://www.scopus.com/inward/record.url?scp=38949188902&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38949188902&partnerID=8YFLogxK

U2 - 10.1021/ja076503n

DO - 10.1021/ja076503n

M3 - Article

C2 - 18189392

AN - SCOPUS:38949188902

VL - 130

SP - 1676

EP - 1680

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 5

ER -