Abstract

Ultrathin films consisting of titanium oxide and gold nanoparticles were prepared using a combination of the surface sol–gel process and liquid/liquid interfacial precipitation. The composite films had a titanium oxide/gold nanoparticle layer/titanium oxide film structure, comprising a gold nanoparticle thin-film layer sandwiched within titanium oxide films of nanometer-order thickness. Upon heating the titanium oxide–gold nanoparticle composite films to 450 °C, they underwent a phase change from the amorphous to the anatase phase, which was confirmed via Raman scattering analysis. It was observed that, even after heating, the plasmonic absorption band due to the presence of gold nanoparticles was maintained in the composite films. The photocatalytic degradation efficiencies of methylene blue dye were evaluated in films under 520 nm light irradiation. The results suggested that the sandwich-like structure of this titanium oxide/gold nanoparticle layer/titanium oxide is promising for the visible-light-induced degradation of methylene blue dye.

中文翻译：

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表面溶胶-凝胶法制备氧化钛-金纳米颗粒复合超薄膜的制备及光催化性能

摘要

使用表面溶胶-凝胶工艺和液/液界面沉淀相结合的方法制备了由氧化钛和金纳米颗粒组成的超薄膜。该复合膜具有氧化钛/金纳米颗粒层/氧化钛膜结构，其包括夹在纳米级厚度的氧化钛膜内的金纳米颗粒薄膜层。将二氧化钛-金纳米粒子复合膜加热到450°C后，它们经历了从无定形到锐钛矿相的相变，这通过拉曼散射分析得到了证实。观察到，即使在加热之后，由于金纳米颗粒的存在而导致的等离子体吸收带仍保持在复合膜中。在520nm的光照射下，评价薄膜中亚甲基蓝染料的光催化降解效率。结果表明，该氧化钛/金纳米颗粒层/氧化钛的三明治状结构有望用于可见光诱导的亚甲基蓝染料降解。