Ultrafast Plasmon-Induced Electron Transfer from Gold Nanodots into TiO<sub>2</sub> Nanoparticles

Furube, Akihiro; Du, Luchao; Hara, Kohjiro; Katoh, Ryuzi; Tachiya, M.

doi:10.1021/ja076134v

Cited by 919 publications

(945 citation statements)

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“…13d A similar route was also proposed for an organic solar cell system composed of ZnPc/Ag/ITO, in which it was assumed that "free" electron gas transfers energy to one electron, which in its exited state can fill the empty state of ITO (in our case CB of titania), if it has momentum perpendicular to the contact area, and at the same positive charge, the empty state left in the metal particle has to be filled again with 5 an electron from ZnPc (in our case from OCs); 47 Furube et al reported direct observation of electron transfer from gold nanodots to titania particles using femtosecond transient absorption spectroscopy with an IR probe. 48 However, estimated reaction time (240 fs) seemed to be much longer than the lifetime of the gold LSPR excitation state, presumably caused by limited time resolution of their instrumental setups. Using a setup with time 10 resolution < 50 fs, direct electron transfer from gold to titania was suggested.…”

Section: (2)mentioning

confidence: 99%

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Kowalska

Mahaney

Abe

et al. 2010

Phys. Chem. Chem. Phys.

517

419

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Fifteen commercial titania (titanium(IV) oxide; TiO 2 ) powders were modified with gold by photodeposition to prepare photocatalysts that work under irradiation with light in the visible range (vis). The gold-modified titania (Au/TiO 2 ) powders were characterized by diffuse reflectance spectroscopy (DRS), field-emission scanning electron microscopy (FE-SEM), scanning transmission microscopy (STEM) and X-ray powder diffraction analysis (XRD). It was shown that all tested powders could absorb visible light with an absorption maximum at localized surface plasmon resonance (LSPR) wavelengths (530-600 nm) and that the size and shape of gold nanoparticles determined absorption ranges.The photocatalytic activity of Au/TiO 2 powders was examined both under ultraviolet and vis irradiation (mainly >450 nm) for acetic acid and 2-propanol photooxidation. It was found that the activity depended strongly on gold and titania properties, such as particle size and shape, surface area and crystalline form. Under vis irradiation, large rutile particles loaded with gold particles of a wide range of sizes showed the highest level of photocatalytic activity, possibly due to greater light absorption ability in a wide wavelength range resulting from transverse and longitudinal LSPR of rod-like gold particles. Action spectrum analyses showed that visible light-induced oxidation of organic compounds by aerated gold-titania suspensions was initiated by excitation of LSPR absorption of gold. Although photocatalytic activity of nanosized gold particles under vis irradiation with a wavelength of ca. 430 nm and catalytic activity of goldmodified titania during dark reaction were also found, it was shown that the activities of 2 Au/TiO 2 particles originated from activation of LSPR of gold by light of wavelength of 530-650 nm. Participation of molecular oxygen as an electron acceptor and titania as a conductor of electrons was suggested by comparison with results obtained under deaerated conditions and results obtained using a system containing gold-deposited silica instead of gold-titania, respectively. On the basis of these results, the mechanism of visible light-induced oxidation of organic compounds on gold-titania is proposed. IntroductionTitanium(IV) oxide (TiO 2 ; titania) is an inexpensive particulate material that is readily available and has substantial photocatalytic activity, stability toward inorganic and organic compounds and non-toxicity. 1 However, one drawback of titania is that it can only be excited by ultraviolet light, i.e., with wavelengths shorter than ca. 400 nm.Therefore, only a very small portion of solar radiation (3-5%) can be utilized to drive chemical reactions. 2 Thus, extension of its absorption wavelength range to the visible region (vis) is an important issue. Another important issue is improvement of quantum efficiency, i.e., an efficiency of utilization of the photoexcited state of photocatalysts, since an electronic excited state of titania is deactivated by recombination of electrons and holes to lower qu...

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Section: (2)mentioning

confidence: 99%

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Kowalska

Mahaney

Abe

et al. 2010

Phys. Chem. Chem. Phys.

517

419

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“…As illustrated in the energy diagram in Figure 6, it is hypothesized that an excited electron is transferred to the conduction band of TiO 2 immediately following the inter-or intraband transition of the Au nanoparticles induced by the plasmonically enhanced optical near-field, 58 thus leaving a hole trapped to the surface states of the TiO 2 near the Au/TiO 2 /water interface; the trapped holes can subsequently induce the oxidation of water molecules. 59 It is possible for multiple holes to form and become trapped at the restricted nanospace near the Au/TiO 2 interface because the plasmonically enhanced optical near-field is induced at both ends of the Au nanoparticles, especially at the Au/TiO 2 /water interface, as determined using electromagnetic simulations.…”

Section: Mechanism Of Photoelectric Conversionmentioning

confidence: 99%

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Ueno

Misawa

2013

NPG Asia Mater

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This paper presents recent investigations of plasmon-enhanced photoelectric conversion and water oxidation by visible and nearinfrared light irradiation. Since the discovery of the Honda-Fujishima effect in 1972, significant efforts have been devoted to lengthening the light-energy conversion wavelength. In this context, plasmonic photoelectric conversion has been recently demonstrated at visible-to-near-infrared wavelengths without deteriorating photoelectric conversion by employing titanium dioxide (TiO 2 ) single-crystal photoelectrodes, in which gold nanorods are elaborately arrayed on the surface. A potassium perchlorate aqueous solution was employed as an electrolyte solution without additional electron donors; thus, water molecules provided the electrons. The stoichiometric evolution of oxygen and hydrogen peroxide as a result of the four-or two-electron oxidation of water molecules, respectively, was accomplished with near-infrared light irradiation using the plasmonic optical antenna effect. As there is very little overpotential for water oxidation, these results constitute a significant advancement in this field. In addition, this photoelectric conversion system could potentially be employed in artificial photosynthesis systems that exceed the photosynthetic capabilities of plants by allowing for photoconversion over a wide range of wavelengths.

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“…3), the Au/g-C 3 N 4 composite (red curve) shows an additional absorption peak around 550 nm, which can be attributed to the surface plasmon of Au nanoparticles. 40 However, for the CdS/Au/g-C 3 N 4 composite, the absorption around 550 nm disappears (blue curve in the inset of Fig. 3) due to the formation of CdS shell on Au.…”

mentioning

confidence: 96%

Enhanced photocatalytic H₂ evolution over CdS/Au/g-C₃N₄ composite photocatalyst under visible-light irradiation

Ding

Zhao

et al. 2015

APL Materials

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Ultrafast Plasmon-Induced Electron Transfer from Gold Nanodots into TiO₂ Nanoparticles

Cited by 919 publications

References 18 publications

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Enhanced photocatalytic H₂ evolution over CdS/Au/g-C₃N₄ composite photocatalyst under visible-light irradiation

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Ultrafast Plasmon-Induced Electron Transfer from Gold Nanodots into TiO2 Nanoparticles

Cited by 919 publications

References 18 publications

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Enhanced photocatalytic H2 evolution over CdS/Au/g-C3N4 composite photocatalyst under visible-light irradiation

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Ultrafast Plasmon-Induced Electron Transfer from Gold Nanodots into TiO₂ Nanoparticles

Enhanced photocatalytic H₂ evolution over CdS/Au/g-C₃N₄ composite photocatalyst under visible-light irradiation