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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Photoinduced degradation of fluorescence and formation of copper nanoparticles in sol-gel silica doped with flavins
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Photoinduced degradation of fluorescence and formation of copper nanoparticles in sol-gel silica doped with flavins

机译：黄酮掺杂的溶胶-凝胶二氧化硅中荧光的光诱导降解和铜纳米颗粒的形成

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摘要

Copper nanoparticles were formed by photoirradiation of doped sol-gel silica, which was prepared by mixing Cu~(2+) ions, ethylenediaminetetraacetic acid (EDTA), and riboflavin into sol-gel solutions of tetramethoxysilane. The doped silica exhibited broad absorption bands at 442 nm due to riboflavin and 740 nm due to Cu~(2+)-EDTA complexes. After photoirradiation, the sol-gel silica showed a reddish brown color and the absorption peak around 580 nm due to the plasmon band of copper nanoparticles. Copper nanoparticles were also formed from other sol-gel silica doped with lumichrome or lumiflavin. The photostability of the flavins dyes obtained from the fluorescence intensities was in the order of lumichrome > lumiflavin > riboflavin in the sol-gel silica without Cu~(2+) ions. On the other hand, the fluorescence intensities were considerably reduced by photoirradiation of the sol-gel silica doped with Cu~(2+) ions, irrespective of the flavin dyes doped. Considering the absorption and fluorescence spectral changes during the photoirradiation, we concluded that copper nanoparticles are produced by the photoinduced electron transfer from the flavin dyes in the sol-gel silica.
机译：通过将铜〜（2+）离子，乙二胺四乙酸（EDTA）和核黄素混合到四甲氧基硅烷的溶胶-凝胶溶液中制备掺杂的溶胶-凝胶二氧化硅，形成铜纳米颗粒。掺杂的二氧化硅由于核黄素而在442 nm处显示宽吸收带，而由于Cu〜（2 +）-EDTA络合物在740 nm处显示宽吸收带。在光辐照之后，由于铜纳米颗粒的等离激元带，溶胶-凝胶二氧化硅显示出红棕色，吸收峰在580 nm附近。铜纳米颗粒也由其他掺杂有发光铬或发光黄素的溶胶-凝胶二氧化硅形成。在没有Cu〜（2+）离子的溶胶-凝胶二氧化硅中，由荧光强度得到的黄素类染料的光稳定性按发光度>发光黄素>核黄素的顺序排列。另一方面，不管掺杂的黄素染料如何，通过掺杂Cu〜（2+）离子的溶胶-凝胶二氧化硅的光辐照，荧光强度大大降低。考虑到光辐照过程中的吸收和荧光光谱变化，我们得出结论，铜纳米颗粒是由溶胶-凝胶二氧化硅中黄素染料的光诱导电子转移产生的。

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