Direct observation of charge separation on Au localized surface plasmons

Sá, Jacinto; Tagliabue, Giulia; Friedli, Peter; Szlachetko, Jakub; Rittmann-Frank, Mercedes Hannelore; Sawka‐Dobrowolska, W.; Milne, Christopher J.; Sigg, H.

doi:10.1039/c3ee42731e

Cited by 75 publications

(43 citation statements)

References 69 publications

(17 reference statements)

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“…Various energy-transfer processes have been proposed to explain the improved activity of photocatalysts comprising co-catalysts with SPR effect. Direct Electron Transfer (DET) is realized when of "hot" electrons produced by irradiation of plasmonic metal nanoparticles possess enough energy to overcome the Schottky barrier at the metal/TiO 2 interface and are injected into the conduction band of the semiconductor [88,89]. An increase of electron-hole generation rate in the Au/TiO 2 composites has been related with Local ElectroMagnetic Field (LEMF) enhancement near the surface of TiO 2 [90] or Plasmonic Resonant Energy Transfer (PRET) from metal to semiconductor [91].…”

Section: Increasing Activity Under Visible Light: Self-doping Vs Surfmentioning

confidence: 99%

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

Montini

Monai

Beltram

et al. 2016

Materials Science in Semiconductor Processing

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Section: Increasing Activity Under Visible Light: Self-doping Vs Surfmentioning

confidence: 99%

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

Montini

Monai

Beltram

et al. 2016

Materials Science in Semiconductor Processing

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“…Thus, catalytic activity must be carried out by the smaller facets (100) corners and (110) triangle thickness or the highly under-coordinated Au sites at the sharp facet's intersections. These corners may form Schottky barriers in the interface with the solid helping to avoid the recombination of carriers generated upon excitation and thus increasing the photocatalytic activity [10,[43][44][45]. The contribution of GNT to the photocatalysts at visible and infrared wavelength may be provided by the concentration of plasmonic near-field enhancement at the triangle corners creating highly energetic hot spots [31,[45][46][47].…”

Section: Evaluation Of Selected Plasmonic Photocatalysts Towards the mentioning

confidence: 99%

In-Situ Deposition of Plasmonic Gold Nanotriangles and Nanoprisms onto Layered Hydroxides for Full-Range Photocatalytic Response towards the Selective Reduction of p-Nitrophenol

2018

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In this work, we present photocatalysis as a greener alternative to conventional catalysis where harsh reaction conditions, temperature and/or pressure are needed. Photodegradation of organic pollutants is a cost-effective, eco-friendly solution for the decontamination of water and air, and is a field that has been continuously growing over the last decade. Plasmonic metal nanoparticles absorb light irradiation that is transferred to the chemical reaction in a different fashion. Furthermore, plasmonic nanostructures can be combined with other materials, such as semiconductors or a basic support, to create hybrid systems capable of overcoming certain challenges that photocatalysis is facing nowadays and to expand the photocatalytic response towards the whole visible-near infrared (Vis-NIR) ranges. The main objective of this work has been to in-situ synthesize plasmonic anisotropic gold nanoparticles onto hydrotalcite (HT) and calcined hydrotalcite (CHT) supports by way of a sequential deposition-reduction (DR) process and to evaluate their efficiency as heterogeneous catalysts towards the selective oxidation of p-nitrophenol (hereafter 4-NP), a well-known model contaminant, either in the absence or the presence of full-range light irradiation sources (LEDs) spanning the whole UV-Vis-NIR range. Special attention has been paid to the optimization of the catalyst preparation parameters, including the pH and the concentration of reducing and stabilizing agents. Interestingly, the use of thermally modified hydrotalcites has enabled a strong metal-support interaction to induce the preferential formation of triangular-shaped Au nanoparticles with ca. 0.8 wt.% loading while increasing the colloidal stability and surface area of the catalyst with respect to the commercial untreated HT supports.

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“…One mechanism attributed to the LSPR where electrons in the Pd are excited sufficiently to overcome the Schottky barrier at the semiconductor/ metal interface and transfer 'hot electrons' to the TiO 2 ( Figure 4a) has been previously reported. 35 The height of the Schottky barrier (ϕ B )…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Plasmon enhanced visible light photocatalysis for TiO₂ supported Pd nanoparticles

2015

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A photocatalyst consisting of nanostructured Pd photochemically deposited on 20 nm TiO2 displays a reaction half-life for rhodamine b decolourisation of 0.5 minute compared to the 9.4 minutes for unmodified P25 under identical reaction conditions. We associate this increased decolourisation rate to the increase in solar light harvesting which we have measured at 8% due to a significant red shift in the absorption profile of the catalyst. We relate the increased absorption of light with a visible active plasmon effect that is associated with the Pd nanostructures on the TiO2. This overall red-shift in the light harvesting for the catalyst leads to photocatalytic activity for excitations up to 600 nm.

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Direct observation of charge separation on Au localized surface plasmons

Cited by 75 publications

References 69 publications

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

In-Situ Deposition of Plasmonic Gold Nanotriangles and Nanoprisms onto Layered Hydroxides for Full-Range Photocatalytic Response towards the Selective Reduction of p-Nitrophenol

Plasmon enhanced visible light photocatalysis for TiO₂ supported Pd nanoparticles

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Direct observation of charge separation on Au localized surface plasmons

Cited by 75 publications

References 69 publications

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

H2 production by photocatalytic reforming of oxygenated compounds using TiO2-based materials

In-Situ Deposition of Plasmonic Gold Nanotriangles and Nanoprisms onto Layered Hydroxides for Full-Range Photocatalytic Response towards the Selective Reduction of p-Nitrophenol

Plasmon enhanced visible light photocatalysis for TiO2 supported Pd nanoparticles

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Plasmon enhanced visible light photocatalysis for TiO₂ supported Pd nanoparticles