Photoinduced electron accumulation in colloidally dispersed wide band-gap semiconductor nanosheets

Nakato, Teruyuki; Yamada, Yoshimi; Nakamura, Mari; Takahashi, Akihiro

doi:10.1016/j.jcis.2010.10.026

Cited by 6 publications

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References 40 publications

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“…On the other hand, the visible diffuse reflectance spectra of the sample irradiated for 5–30 min, shown in Figure B, exhibit a very broad absorption band extending over the measured wavelength region with peaks around 400 and 650 nm. These bands are assigned to a reduced (lower-valent) Nb species in the niobate particles. − Organic species intercalated in or adsorbed on the layered niobate has been reported to act as a sacrificial donor to consume the positive holes in the niobate layers generated by photoexcitation of the semiconductor oxide; , and thus the Nb species in the niobate layers is reduced.…”

Section: Resultsmentioning

confidence: 99%

“…These bands are assigned to a reduced (lower-valent) Nb species in the niobate particles. 73−75 Organic species intercalated in or adsorbed on the layered niobate has been reported to act as a sacrificial donor to consume the positive holes in the niobate layers generated by photoexcitation of the semiconductor oxide; 60,76 and thus the Nb species in the niobate layers is reduced. TPP molecules added to the emulsion are also photodecomposed.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Nakato

Ueda

Hashimoto

et al. 2012

ACS Appl. Mater. Interfaces

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We investigated emulsions stabilized with particles of layered hexaniobate, known as a semiconductor photocatalyst, and photocatalytic degradation of dyes in the emulsions. Hydrophobicity of the niobate particles was adjusted with the intercalation of alkylammonium ions into the interlayer spaces to enable emulsification in a toluene-water system. After the modification of interlayer space with hexylammonium ions, the niobate stabilized water-in-oil (w/o) emulsions in a broad composition range. Optical microscopy showed that the niobate particles covered the surfaces of emulsion droplets and played a role of emulsifying agents. The niobate particles also enabled the generation of oil-in-water (o/w) emulsions in a limited composition range. Modification with dodecylammonium ions, which turned the niobate particles more hydrophobic, only gave w/o emulsions, and the particles were located not only at the toluene-water interface but also inside the toluene continuous phase. On the other hand, interlayer modification with butylammonium ions led to the formation of o/w emulsions. When porphyrin dyes were added to the system, the cationic dye was adsorbed on niobate particles at the emulsion droplets whereas the lipophilic dye was dissolved in toluene. Upon UV irradiation, both of the dyes were degraded photocatalytically. When the cationic and lipophilic porphyrin molecules were simultaneously added to the emulsions, both of the dyes were photodecomposed nonselectively.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Nakato

Ueda

Hashimoto

et al. 2012

ACS Appl. Mater. Interfaces

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Colloidal Nanosheets

Miyamoto

Ohsedo

Nakato

2017

Nanostructure Science and Technology

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Decomposition of a cyanine dye in binary nanosheet colloids of photocatalytically active niobate and inert clay

et al. 2013

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Photoinduced electron accumulation in colloidally dispersed wide band-gap semiconductor nanosheets

Cited by 6 publications

References 40 publications

Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Colloidal Nanosheets

Decomposition of a cyanine dye in binary nanosheet colloids of photocatalytically active niobate and inert clay

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Photoinduced electron accumulation in colloidally dispersed wide band-gap semiconductor nanosheets

Cited by 6 publications

References 40 publications

Pickering Emulsions Prepared by Layered Niobate K4Nb6O17 Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Pickering Emulsions Prepared by Layered Niobate K4Nb6O17 Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Colloidal Nanosheets

Decomposition of a cyanine dye in binary nanosheet colloids of photocatalytically active niobate and inert clay

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Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions

Pickering Emulsions Prepared by Layered Niobate K₄Nb₆O₁₇ Intercalated with Organic Cations and Photocatalytic Dye Decomposition in the Emulsions