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

我们调查了由尼橙色纳米片组成的胶体系统的光化学行为，该材料通过去角质分层的六烷虫酸盐K_4NB_6O_ <17>被称为光催化剂，光化学上无效的纳米片，用于Hotroite粘土粘土和甲基化学家（MV^<2+ <2+）的光化纳米片。多组分胶体暴露的稳定光诱导的电荷分离。该行为被分配给胶体分散的光催化活性尼贝特纳米片的独特上层建筑。这样的结构原理可用于设计新型的光学转换系统。结果总结如下1。 Niobate和Clay纳米片的共存是稳定电荷分开的先决条件。它们会导致微相分离在结膜中形成微域，并且MV2+分子被选择性地吸附在粘土纳米片上。这种结构导致尼焦纳米片的空间分离作为电子供体工作，MV^<2+>分子B…更易于作为电子受体来稳定电荷分离状态。2。胶体诱导的电子从Niobate纳米片转移到MV^<2+>分子的光照相。在适当的条件下，降低的Viologen物种的寿命超过10小时，其寿命比在固体系统中观察到的寿命长，该系统将MV^<2+>分子掺入Niobate中。这种稳定性是不寻常的，因为胶体系统的流动性允许向后电子传输3。电荷分离的稳定性在很大程度上取决于胶体中共存的粘土浓度。随着粘土含量的增加，电荷分离状态变得稳定。但是，当粘土含量很高以凝胶胶体时，不会发生电子转移。这些结果表明，当纳米片的扩散被减速但不完全抑制时，稳定的电荷分离发生。4。稳定的电荷分离是通过简单地利用系统的各种特征（例如域结构，流动性）以及将捐赠者和受体功能除以构成而实现的。较少的

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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