Novel accumulation of photo-induced MV+˙ embedded in a TiO2 shell and discharge of electrons to a Pt electrode

Miyoshi, Hirokazu; Katayama, Shuhei; Kurashina, Masashi; Kanezaki, Eiji

doi:10.1039/c000262c

Cited by 3 publications

(1 citation statement)

References 9 publications

(10 reference statements)

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“…A simple preparation of TiO 2 Nps with a capsule structure has also been reported 5 . Miyoshi et al reported that photogenerated electrons that had accumulated on encapsulated 1,1'-dimethyl-4,4'-bipyridyl (MV 2+ ) molecules in TiO 2 nanocapsules were detected as MV +• radicals and that their electrons were released as an anodic current after turning off the light used for photogeneration 6 . However, in the preparation of the nanocapsules, Au Nps were used as a core.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Electron Accumulation of Titanium Dioxide Nanoparticles Modified Electrodes

Miyoshi

Sakamoto

Kurashina

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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Titanium dioxide ( TiO 2) nanoparticles (Nps) were prepared by the hydrolysis of titanium tetraisopropoxide ( TTIP ) in 2-propanol with different water contents (0.5 vol% to 7.2 vol%) at 45 °C. The diameter of the Nps was estimated to be 1.5±0.5 nm ( L - TiO 2) and 3.0±0.6 nm ( S - TiO 2) from the onset wavelength in the absorption spectra and by transmission electron microscopy (TEM). A modified Pt electrode with a three-layered sandwich structure was prepared; the outermost and innermost layers were composed of S - TiO 2 and L - TiO 2, respectively, and the middle layer contained 1, 1'-dimethyl-4,4'-bipyridyl ( MV 2+)/Nafion®. Irradiation by a 500 W superhigh-pressure mercury lamp produced electrons in the conduction band of TiO 2. An anodic current was observed after turning off the light. The mechanism by which anodic current is generated after turning off the radiation involves the reduction of MV 2+ to MV +. by photogenerated electrons on the Nps and the diffusion of MV +. in the middle layer. After turning off the irradiation, MV +. transferred an electron to the Pt electrode via holes in the innermost layer or the conduction band of S - TiO 2 coincidentally localized on the Pt electrode, resulting in the generation of the anodic current. The generation of MV +. was confirmed by the absorption spectra of MV +.. As a sacrificial reagent, 2-propanol (0.1 M) was used.

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Section: Introductionmentioning

confidence: 99%

Photoinduced Electron Accumulation of Titanium Dioxide Nanoparticles Modified Electrodes

Miyoshi

Sakamoto

Kurashina

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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Ultrafast Photoinduced Electron Transfer in Viologen‐Linked BODIPY Dyes

et al. 2013

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New boron-dipyrromethene (BODIPY) dyes linked to viologen are prepared and their photophysical and electrochemical properties are investigated. Both synthesized molecules have similar electronic absorption spectra with the absorption maximum localized at 517 and 501 nm for dye 1 and dye 2, respectively. They exhibit well-defined redox behavior, highlighting the presence of BODIPY and viologen subunits, with little perturbation of the redox potential of both subunits with respect to the parent compounds. Both dyes are heavily quenched by photoinduced electron transfer from the BODIPY to the viologen subunit. The transient absorption technique demonstrates that dye 2 forms the viologen radical within a timeframe of 7.1 ps, and that the charge-separated species has a lifetime of 59 ps. Sustained irradiation of dye 2 in the presence of a tertiary amine allows for the accumulation of BODIPY-methyl-4,4'-bipyridinium (BODIPY-MV(+)), as observed by its characteristic absorption at 396 and 603 nm. However, dye 2 does not generate catalytic amounts of hydrogen under standard conditions.

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γ-Ray induced catalytic properties of the silica nanoparticles dispersed in the aerated aqueous solution

Miyoshi

Ikeda

Kojima

2012

J Radioanal Nucl Chem

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Novel accumulation of photo-induced MV+˙ embedded in a TiO2 shell and discharge of electrons to a Pt electrode

Cited by 3 publications

References 9 publications

Photoinduced Electron Accumulation of Titanium Dioxide Nanoparticles Modified Electrodes

Photoinduced Electron Accumulation of Titanium Dioxide Nanoparticles Modified Electrodes

Ultrafast Photoinduced Electron Transfer in Viologen‐Linked BODIPY Dyes

γ-Ray induced catalytic properties of the silica nanoparticles dispersed in the aerated aqueous solution

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