Development of photofunctional nanohybrids by using soft matrices provided by colloidally dispersed niobate nanosheets

利用胶体分散的铌酸盐纳米片提供的软基质开发光功能纳米杂化物

基本信息

批准号：
16350107
负责人：
NAKATO Teruyuki
金额：
$ 9.73万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We investigated photochemical behavior of a colloidal system composed of niobate nanosheets prepared by exfoliating layered hexaniobate K_4Nb_6O_<17> known as a photocatalyst, photochemically inactive nanosheets of hectroite clay, and methylviologen (MV^<2+>) that can work as an electron acceptor. The multi-component colloid exhibited stable photoinduced charge-separation. This behavior was ascribed to a unique superstructure of the colloidally dispersed photocatalytically active niobate nanosheets. Such a structural principle can be utilized to design novel photoenergy conversion systems. The results are summarized as follows.1. Coexistence of the niobate and clay nanosheets is prerequisite for the stable charge-separation. They cause microphase separation to form microdomains in the colloid, and the MV2+ molecules are selectively adsorbed on the clay nanosheets. This structure results in spatial separation of the niobate nanosheets working as an electron donor and MV^<2+> molecules b … More ehaving as an electron acceptor to stabilize the charge-separated state.2. Photoirradiation of the colloid induced electron transfer from the niobate nanosheets to the MV^<2+> molecules. The lifetime of reduced viologen species exceeds 10 h under appropriate conditions, the lifetime which is longer than that observed for the solid system where MV^<2+> molecules are incorporated into the niobate. Such stability is unusual because fluidity of the colloidal system allows backward electron transfer.3. The stability of charge-separation greatly depends on the concentration of clay coexisting in the colloid. The charge-separated state becomes stable as increasing the clay content. However, electron transfer does not occur when the clay content is very high to gel the colloid. These results suggest that the stable charge-separation takes place when the diffusion of the nanosheets is decelerated but not completely suppressed.4. The stable charge-separation is achieved by simultaneously utilizing various characteristics of the system, such as domain structure, fluidity, and dividing the donor and acceptor functions by constituents. Less

我们研究了由niobate纳米表组成的胶体系统，该胶质纳米表由六核酸盐_6o _ <17>剥离，被称为光催化剂，光化学的无效纳米片库层粘土受体的无效纳米果结果总结如下，纳米粒子是TARGE分离的先决条件。更多地作为电子受体，以稳定分离。分子被纳入尼古特。粘土含量很高，可以凝胶胶体，表明稳定的电荷分离发生在纳米片的扩散被减速但不完全抑制时。系统的各种特征，例如域结构，流动性以及将供体和受体功能划分为成分。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Colloid Science of Exfoliated Nanosheets

剥离纳米片的胶体科学

DOI：
发表时间：
2005
期刊：
Science and Application of Inorganic Nanosheets (ed. by K.Kuroda, T.Sasaki) (CMC Press, Tokyo)
影响因子：
0
作者：
T.Nakato;Y.Yamashita;K.Kuroda;Hiroshi Koshikawa;Masanori Fukushima;T.Nakato
通讯作者：
T.Nakato

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