Enhancement of photocatalytic activity using UV light trapping effect

Nuida, Tomohiro; Kanai, N.; Hashimoto, Kazuhito; Watanabe, Toshiya; Ohsaki, Hisashi

doi:10.1016/j.vacuum.2004.01.057

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…Structurally, mass transfer (reactant to active sites), charge transfer (catalyst surface to reactant) and charge transport (catalyst bulk to its surface) must be considered [4]. Access to more active sites, an improved collection/harvesting of photogenerated charge carriers and light trapping [23] are desirable approaches towards higher quantum yields. In light of this, extensively documented experimental techniques towards various target structures have emerged over the course of recent decades [4].…”

Section: Introductionmentioning

confidence: 99%

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

2019

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This work aims at the identification of porous titanium dioxide thin film (photo)electrodes that represent suitable host structures for a subsequent electrodeposition of plasmonic nanoparticles. Sufficient UV absorption and electrical conductivity were assured by adjusting film thickness and TiO 2 crystallinity. Films with up to 10 layers were prepared by an evaporation-induced self-assembly (EISA) method and layer-by-layer deposition. Activities were tested towards the photoelectrochemical oxidation of water under UV illumination. Enhanced activities with each additional layer were observed and explained with increased amounts of immobilized TiO 2 and access to more active sites as a combined effect of increased surface area, better crystallinity and improved transport properties. Furthermore, films display good electrochemical and mechanical stability, which was related to the controlled intermediate thermal annealing steps, making these materials a promising candidate for future electrochemical depositions of plasmonic noble metal nanoparticles that has been further demonstrated by incorporation of gold.

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Section: Introductionmentioning

confidence: 99%

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

2019

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“…Heller's group has prepared transparent and abrasion-resistant photocatalyst films on glass to degrade thin layers of organic contaminants. 1,2 Recently, Nuida et al 3 have shown that one can obtain a self-cleaning Al mirror with a photocatalytic TiO 2 deposited layer. Mills et al 4 presented a commercial self-cleaning glass (Pilkington Glass Activ R ) with a film of nanocrystalline titanium dioxide.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic efficiencies of self-cleaning glasses. Influence of physical factors

Peruchon

Puzenat

Herrmann

et al. 2009

Photochem Photobiol Sci

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Two commercial types of self-cleaning glass (SCG) have been tested to confirm the real photocatalytic nature of their properties. This was done by using four photocatalytic tests: (i) in the gas phase with the total oxidation of acetylene; (ii) in water with the total degradation of malic acid, (iii) in water with the total degradation of methylene blue, and (iv) in the solid phase with the total oxidative degradation of a layer of stearic acid deposited on the self-cleaning glass surface, in contact with the superficial titania coating. The influence of various factors (temperature, humidity, wavelength, radiant flux, presence of inorganic particles stuck at the glass surface) was explained in line with the fundamentals of photocatalysis. The results helped to understand the behaviour of self-cleaning glass.

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“…For example, TiO 2 /WO 3 heterogeneous semiconductor systems have been studied to increase the charge separation efficiency and have shown good photosensitivity for hydrophilic conversion under weak UV light irradiation. 6 Moreover, an optically photoconfined system (TiO 2 /SiO 2 /Al layered system 7 ) has been investigated to maximize the fraction of photons absorbed under light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on the Photochemical Properties of TiO₂ Thin Films

et al. 2009

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Sputtered TiO 2 films with residual stresses ranging from compressive to tensile were fabricated by use of substrates with different thermal expansion coefficients. With these stress-controlled films, changes in the photocatalytic oxidation and photoinduced hydrophilic conversion activities were investigated. The photocatalytic oxidative decomposition of cis-9-octadecenoic acid showed little stress dependence. In contrast, the photoinduced hydrophilic conversion showed remarkable stress dependence. The rate constant for the hydrophilic conversion of a film with large tensile stress (σ ) -1120 ( 200 GPa) was 5 times greater than that of a film with negligibly small compressive stress (σ ) +270 ( 200 GPa). In contrast, introducing large compressive stress (σ ) +890 ( 250 GPa) reduced it to 1/16 of that for the film with negligibly small compressive stress. On the basis of these results, we have proposed an effective pressure effect on photoinduced hydrophilic conversion and have experimentally estimated the apparent positive activation volume (ca. +5 × 10 -6 m 3 /mol) for that reaction, in accordance with transition state theory.

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Enhancement of photocatalytic activity using UV light trapping effect

Cited by 15 publications

References 6 publications

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

Photocatalytic efficiencies of self-cleaning glasses. Influence of physical factors

Effect of Residual Stress on the Photochemical Properties of TiO₂ Thin Films

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Enhancement of photocatalytic activity using UV light trapping effect

Cited by 15 publications

References 6 publications

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

Photocatalytic efficiencies of self-cleaning glasses. Influence of physical factors

Effect of Residual Stress on the Photochemical Properties of TiO2 Thin Films

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Product

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Effect of Residual Stress on the Photochemical Properties of TiO₂ Thin Films