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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >In situ Generation of Au Nanoparticles in UV-curable Refractive Index Controlled SiO2-TiO2-PEO Hybrid Films
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In situ Generation of Au Nanoparticles in UV-curable Refractive Index Controlled SiO2-TiO2-PEO Hybrid Films

机译：紫外光固化控制的SiO2-TiO2-PEO杂化膜中金纳米粒子的原位生成

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UV-curable inorganic (SiO2-TiO2)-organic (polyetheylene oxide [PEO]) hybrid films with high refractive index (RI) values were synthesized, and Au nanoparticles were generated in situ inside such hybrid films. The hybrid films and the corresponding Au-doped films were prepared from sols derived from a mixture of silicon, titanium, and organically modified silicon alkoxides and gold chloride following a sol—gel dip-coating method. An equivalent SiO2/TiO2/PEO/Au molar ratio (nominal) of 27.7:46.1:23.0:3.2 was maintained in the sol. UV treatments of the dried (90 °C) films with energies from 5.3 ± 0.1 to 53.0 ± 0.5 J cm~(-2) resulted in densification with a gradual increase of the RI value up to 1.75. Drying and UV treatments of the corresponding HAuCl4-incorporated hybrid films induced generation of Au nanoparticles and showed the characteristic Au—plasmon peak. A gradual red-shifting of the Au—plasmon band from 545 to 571 nm was observed with respect to the UV-treatment energies. This red-shifting is initially due to the increase of RI of the film, and in the later stages it is mainly due to the Au—plasmon coupling concurrently with the slight increase of RI values. Transmision electron microscopy of the UV-treated films showed the presence of densely populated Au nanoparticles of mainly 4-5 nm in size inside the hybrid SiO2—TiO2—PEO film matrix.
机译：合成具有高折射率（RI）值的可UV固化的无机（SiO2-TiO2）-有机（聚环氧乙烷[PEO]）杂化膜，并在此类杂化膜内部原位生成Au纳米颗粒。按照溶胶-凝胶浸涂法，由衍生自硅，钛和有机改性的硅醇盐与氯化金的混合物的溶胶制备杂化薄膜和相应的金掺杂薄膜。溶胶中的等效SiO2 / TiO2 / PEO / Au摩尔比（标称）为27.7：46.1：23.0：3.2。能量为5.3±0.1至53.0±0.5 J cm〜（-2）的干燥（90°C）薄膜的UV处理导致致密化，RI值逐渐增加至1.75。相应的掺入HAuCl4的杂化膜的干燥和UV处理诱导了Au纳米粒子的生成，并显示了特征性的Au-等离子体激元峰。相对于UV处理能量，观察到了Au-等离子体激元带从545nm到571nm的逐渐红移。这种红移最初是由于膜的RI增加，而在后期，主要是由于Au-等离子体耦合，同时RI值略有增加。紫外线处理过的薄膜的透射电子显微镜显示，在混合的SiO2-TiO2-PEO薄膜基质内部存在人口密集的Au纳米颗粒，尺寸主要为4-5 nm。

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