Magnetic Field Effects on Photoelectrochemical Responses of Modified Electrodes with Langmuir-Blodgett Monolayer Containing Porphyrin-Viologen Linked Compounds

Yonemura, Hiroaki; Ohishi, Kei; Matsuo, Taku

doi:10.1080/10587259708032287

Cited by 13 publications

(40 citation statements)

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“…First, the modified ITO-electrodes were prepared by depositing a mixed monolayer consisting of ZnP(6)V or ZnP(6)AB and AA (1:10) on ITO-electrodes (1 layer) using the LB technique [16][17][18]. A chloroform solution containing the porphyrin derivatives [ZnP(6)V and ZnP(6)AB] (0.2 mM) mixed with AA (2 mM) at a molar ratio of 1:10 was spread over a water subphase containing CaCl 2 (0.3 mM) and NaHCO 3 (0.05 mM, pH 7.0).…”

Section: Preparation Of the Modified Ito-electrodesmentioning

confidence: 99%

“…We examined the MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with zinc-tetraphenylporphyrin (ZnP)-viologen (V 2+ ) linked compounds [ZnP(n)V (n = 4, 6, 8)] with four, six, or eight methylene groups [16][17][18] and containing semiconductor nanoparticles [19,20]. We also examined the MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with nanoclusters containing a C 60 derivative and a methylphenothiazine group to demonstrate the use of C 60 in a photonic nanodevice [21].…”

Section: Introductionmentioning

confidence: 99%

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Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Yonemura

Niimi

Yamada

2015

J. Porphyrins Phthalocyanines

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Zinc-porphyrin(ZnP)-viologen(V 2+ ) linked compound containing six methylene group (ZnP(6)V)-silver nanoparticle (AgNP) composite films was fabricated by combining electrostatic layerby-layer adsorption and the Langmuir-Blodgett method. The incident photo to photocurrent efficiency (IPCE) values of the ZnP(6)V-AgNP composite films are higher than those of the ZnP(6)V films and much higher than those of ZnP derivative films without V 2+ moiety as a reference. The large increase in the IPCE values of the ZnP(6)V-AgNP composite films likely comes from a combination of localized surface plasmon resonance (LSPR) from AgNPs and photoinduced intramolecular electron-transfer upon linking to a V 2+ moiety. The photocurrents of the ZnP(6)V-AgNP composite films and the ZnP(6)V films increase upon application of a magnetic field. Magnetic field effects (MFEs) were clearly observed for both ZnP(6)V-AgNP composite films and the ZnP(6)V films. Photocurrents increase with magnetic field under low magnetic fields (B ≤ 150-300 mT) and are constant under high magnetic fields (B > 150-300 mT). MFEs can be explained by a radical pair mechanism. The magnitude of the MFEs in the ZnP(6)VAgNP composite films is higher than that in the ZnP(6)V films. A remarkable increase in photocurrent for the ZnP(6)V-AgNP composite films was observed because of LSPR from the AgNPs in the presence of a magnetic field when compared with the ZnP(6)V films in the absence of a magnetic field. KEYWORDS: photocurrent, magnetic field effect, silver nanoparticle, localized surface plasmon resonance, photoinduced intramolecular electron-transfer, radical pair mechanism.

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Section: Preparation Of the Modified Ito-electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Yonemura

Niimi

Yamada

2015

J. Porphyrins Phthalocyanines

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“…15% at 0.5 T in the case of ZnP(8)V-modified electrode) [26,27]. However, the magnetic field dependence for the modified electrode with the nanoclusters of the mixture of C 60 N + and MePH is different (Fig.…”

Section: Mfes On Photocurrents Of the Modified Electrode With Nanoclumentioning

confidence: 98%

“…Photocurrents from the modified electrode were measured under a controlled potential at 0 V vs. Ag/AgCl with a potentiostat in the presence of triethanolamine (TEOA) (50 mM) as a sacrificial electron donor under nitrogen atmosphere. The MFEs on the photoelectrochemical measurements were carried out according to the previous paper [26][27][28][29]. The electrode cell was placed at pole-gap of an electromagnet.…”

Section: Methodsmentioning

confidence: 99%

“…MFEs on the photoelectrochemical reactions of photosensitive electrodes are very important for practical applications of the MFEs to control the photoelectronic functions of molecular devices. Previously, we have examined MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with zinc-tetraphenylporphyrin-viologen linked compounds [26,27] and semiconductor nanoparticles [28,29]. However, MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with nanoclusters have not yet been reported.…”

Section: Article In Pressmentioning

confidence: 99%

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Magnetic field effects on photoelectrochemical reactions of modified electrodes with C₆₀-phenothiazine nanoclusters

Yonemura

Kuroda

Yamada

2006

Science and Technology of Advanced Materials

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Magnetic field effects on the photoelectrochemical reactions of photosensitive electrodes modified with C 60 nanoclusters were examined, intended for the development of nanodevices where photofunctions were controllable with magnetic field. Mixed clusters of a C 60 derivative (C 60 N + ) containing a positive charge and methylphenothiazine (MePH) were prepared by dissolving them in the THF-H 2 O mixed solvent. Diameters of the clusters were estimated to be ca. 100 nm from dynamic light scattering and AFM measurements. Photofunctional electrodes with the nanoclusters of C 60 N + and MePH were fabricated on the electrodes modified with a self-assembled monolayer of HS(CH 2 ) 2 SO 3 À Na + on a gold substrate. The photocurrent action spectrum of the cluster-modified electrode strongly indicates that the photocurrents are ascribed to the photoexcitation of the nanoclusters of C 60 N + . Furthermore, the photocurrents increased with increasing an external magnetic field, typically 3% at 0.5 T. The profile of magnetic field dependence on the photocurrents is in good agreement with the results on the dynamics of radical pair in the nanoclusters of C 60 N + and MePH in the THF-H 2 O mixed solvent. This is suggested that the magnetic field effects are ascribable to the contribution of triplet radical pair that are generated by photoinduced intermolecular electron-transfer from MePH to triplet excited state of nanocluster of C 60 N + , and are explained in terms of spin-lattice relaxation mechanism in radical pair mechanism. r

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Construction of Nanostructures by use of Magnetic Fields and Spin Chemistry in Solid/Liquid Interfaces

Yonemura

2009

Molecular Nano Dynamics

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Magnetic Field Effects on Photoelectrochemical Responses of Modified Electrodes with Langmuir-Blodgett Monolayer Containing Porphyrin-Viologen Linked Compounds

Cited by 13 publications

References 3 publications

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Magnetic field effects on photoelectrochemical reactions of modified electrodes with C₆₀-phenothiazine nanoclusters

Construction of Nanostructures by use of Magnetic Fields and Spin Chemistry in Solid/Liquid Interfaces

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Magnetic Field Effects on Photoelectrochemical Responses of Modified Electrodes with Langmuir-Blodgett Monolayer Containing Porphyrin-Viologen Linked Compounds

Cited by 13 publications

References 3 publications

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

Magnetic field effects on photoelectrochemical reactions of modified electrodes with C60-phenothiazine nanoclusters

Construction of Nanostructures by use of Magnetic Fields and Spin Chemistry in Solid/Liquid Interfaces

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Magnetic field effects on photoelectrochemical reactions of modified electrodes with C₆₀-phenothiazine nanoclusters