粘土科学
Online ISSN : 2186-3563
Print ISSN : 0470-6455
ISSN-L : 0470-6455
粘土科学誌上セミナー
粘土および類縁体を用いたナノ粒子の合成と機能
宮川 雅矢石田 玉青藤村 卓也由井 樹人吉岡 大輔
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2019 年 58 巻 1 号 p. 26-37

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Localized surface plasmon resonance of Au, Ag and Cu nanoparticles (NPs) has attracted tremendous attention due to their visible light absorption and enhancement of the local electric field. Their syntheses by using protectants such as thiols and polymers have been investigated deeply, and numerous studies on morphological controls have ever been reported. In contrast, direct syntheses of the metal NPs on supports have also been important for an application to catalysts. In this point of view, layered compounds seem to be one of the most promising supports because of their large specific surface area and adsorption property. Indeed, syntheses of the metal NPs have been reported in the interlayer spaces of the layered compounds or on the nanosheets obtained by exfoliation. However, the synthetic methods have not been established yet. Here, we briefly introduce our recent studies on hybridization of the Au, Ag or Cu NPs with layered clay minerals or layered titanates, performed independently. The Au NPs were synthesized on montmorillonite nanosheets both by chemical and photoreduction methods, and nanoscopic homogeneity was found to be important for the diameter control of the Au NPs. The interlayer space of titania nanosheet thin film was also found to be effective to produce anisotropic Ag NPs, whose surface plasmon band was observed in the near-infrared region. Not only Ag but also Ag2O was useful to obtain the Ag NPs by using the photocatalytic titania nanosheets as the supports. The obtained nanocomposite showed peculiar photochromism. Similar to the nanosheets as the support, assembly of the nanosheets was used to synthesize diameter-controlled Cu NPs, which showed efficient photoinduced electron transfer. We believe that the nanocomposites described above will contribute to investigation and development of novel functional materials.

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