Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 5, Pages 1323-1331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp807214w
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Funding
- Japan Society for the Promotion of Science [20550171]
- Reimei Research Program of Japan Atomic Energy Agency
- Grants-in-Aid for Scientific Research [20550171] Funding Source: KAKEN
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We investigated photoinduced charge separation occurring in a multicomponent colloidal system composed of oxide nanosheets of photocatalytically active niobate and photochemically inert clay and electron accepting methylviologen dications (MV2+). The inorganic nanosheets were obtained by exfoliation of layered hexaniobate and hectorite clay. The niobate and clay nanosheets were spatially separated in the colloidally dispersed state, and the MV2+ molecules were selectively adsorbed on the clay platelets. UV irradiation of the colloids led to electron transfer from the niobate nanosheets to the MV2+ molecules adsorbed on clay. The photoinduced electron transfer produced methylviologen radical cations (MV center dot+), which was characterized by high yield and long lifetime. The yield and stability of the MV center dot+ species were found to depend strongly on the clay content of the colloid: from a few mol % to similar to 70 mol % of the yield and several tens of minutes to more than 40 h of the lifetime. The contents of the niobate nanosheets and MV2+ molecules and the aging of the colloid also affected the photoinduced charge separation. In the absence of MV2+ molecules in the colloid, UV irradiation induced electron accumulation in the niobate nanosheets. The stability of the electron-accumulated state also depended on the clay content. The variation in the photochemical behavior is discussed in relation to the viscosity of the colloid.
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