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Shimizu, Takashi; Usui, Yuji; Nakagawa, Tomoe; Okushi, Hideyo

doi:10.1023/a:1009950222736

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…(1) 40 Because of the highly similar Au-NP morphology on all samples, we can rule out the effect of the Au-NP orientation on the SBH of Au/STO, which was reported by Kraya et al 41 Although the Schottky properties of the Au/STO junction with a bulk Au electrode were reported to show an STO orientation dependence with a 500 °C annealing treatment under ultrahigh vacuum, 42 it is difficult to expect this effect on our Au-NP/STO because the experimental conditions were largely different. In addition, the flat-band potential (E fb ) of Au-NP/STO was determined using Mott−Schottky plots, as shown in Figure 2f 3b shows the IPCE enhancement at 600 nm upon the addition of TEOA.…”

Section: ■ Resultsmentioning

confidence: 86%

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Shi

Toda

et al. 2020

ACS Appl. Energy Mater.

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Plasmon-induced carrier transfer at metallic nanoparticle/semiconductor heterojunctions has received great attention because of its tremendous potential in applications, such as photocatalysis and photoelectric and energy conversion. The interfacial structure of the heterojunction is known to play an important role in charge transfer as well as the subsequent chemical reactions. Here, we studied the Au nanoparticle (Au-NP)-loaded (100)-, (110)-, and (111)-oriented single-crystalline strontium titanate (STO) as a model to investigate the effects of interfacial structure on the plasmon-induced charge separation between the metallic nanoparticles and semiconductors. Via photoelectrochemical characterizations, we found that the efficiency of the plasmon-induced water oxidation reaction on STO(100) is more than 1.4 times higher than that on the other two orientation facets. This enhancement was demonstrated to stem from the high oxidation ability of plasmon-induced holes captured in the surface states. Furthermore, the molecular processes of water oxidation were investigated by monitoring the surface oxidation status of Au-NP/STO as intermediates of plasmon-induced water oxidation using in situ electrochemical surface-enhanced Raman spectroscopy. The onset potential of Au–O vibrations on Au-NP/STO(100) was determined to be 0.4 V more negative than that of Au-NP/STO(110), further confirming the higher oxidation ability of the plasmon-induced holes. Our observation provides an opportunity to efficiently modulate plasmon-excited hot-carrier reaction processes for photochemical applications through interfacial engineering.

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Section: ■ Resultsmentioning

confidence: 86%

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Shi

Toda

et al. 2020

ACS Appl. Energy Mater.

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“…Because of the complex nature of metal–semiconductor interfaces, the orientation dependence of electronic properties and the associated mechanisms remain open issues. Some researchers argue that little or no orientation dependence is present, for example, on Au, Al/Ge, and Au/Si interfaces, whereas others demonstrate orientation-based variations at CoSi 2 /Si, Au/SrTiO 3 , Au/GaAs and Au/carbon nanotube interfaces . Possible mechanisms have been proposed for specific systems, generally based on metal-induced gap states or Fermi level pinning at the Schottky contact, resulting from different bonding interactions at the interfaces. ,, However, the majority of this research focuses only on the semiconducting substrate orientation.…”

Section: Methodsmentioning

confidence: 99%

Effect of Interface Atomic Structure on the Electronic Properties of Nano-Sized Metal–Oxide Interfaces

2014

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We report that the size dependence of electronic properties at nanosized metal-semiconducting oxide interfaces is significantly affected by the interface atomic structure. The properties of interfaces with two orientations are compared over size range of 20-200 nm. The difference in interface atomic structure leads to electronic structure differences that alter electron transfer paths. Specifically, interfaces with a higher concentration of undercoordinated Ti result in enhanced tunneling due to the presence of defect states or locally reduced tunnel barrier widths. This effect is superimposed on the mechanisms of size dependent properties at such small scales.

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Visible Light Photo-oxidation in Au Nanoparticle Sensitized SrTiO₃:Nb Photoanode

Tian¹,

Suntivich

May³

et al. 2013

J. Phys. Chem. C

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Au nanoparticle decorated SrTiO 3 :Nb (Au/SrTiO 3 :Nb) has been demonstrated as a photoanode for photo-oxidation under visible light. The visible light photo-oxidation is a result of the generation of the hot electrons in the Au nanoparticles, which are subsequently injected into the SrTiO 3 :Nb conduction band. This leaves behind holes for electrochemical oxidation, which can oxidize a variety of chemical species with redox potentials ranging from 0 to 1.23 V vs RHE. The visible light response is most enhanced at the surface plasmon resonance energy of the Au nanoparticles, which we believe reflect the high optical density near the plasmon resonance for the sensitization. This work demonstrates a general route to impart visible light utilization to a wide band gap semiconductor for various energy conversion and environmental applications, including solar fuel generation and organic pollutant decomposition.

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Untitled

Cited by 4 publications

References 8 publications

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Effect of Interface Atomic Structure on the Electronic Properties of Nano-Sized Metal–Oxide Interfaces

Visible Light Photo-oxidation in Au Nanoparticle Sensitized SrTiO₃:Nb Photoanode

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Untitled

Cited by 4 publications

References 8 publications

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Interfacial Structure-Modulated Plasmon-Induced Water Oxidation on Strontium Titanate

Effect of Interface Atomic Structure on the Electronic Properties of Nano-Sized Metal–Oxide Interfaces

Visible Light Photo-oxidation in Au Nanoparticle Sensitized SrTiO3:Nb Photoanode

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Visible Light Photo-oxidation in Au Nanoparticle Sensitized SrTiO₃:Nb Photoanode