摘要: 通过大肠杆菌鞭毛控制 Au 和 Ag 的纳米颗粒的生长及组装，获得稳定的鞭毛 / 金属纳米颗粒分散液。以此分散液以及透析钛溶胶为原料，通过浸渍提拉法制备 TiO 2 /Au(Ag)/TiO 2 夹心结构的复合薄膜。通过透射电子显微镜 ( TEM ) 、紫外 – 可见分光光度计 ( UV-visible spectroscopy ) 对鞭毛、鞭毛 / 贵金属纳米颗粒进行表征。研究发现，该复合膜的夹心结构起到了稳定金属纳米颗粒的作用，而金属纳米颗粒的引入赋予了该复合膜可见光催化活性。

Abstract: In this work, flagella are used to control over the growth and assembly of Au and Ag nanoparticles, and a stable dispersion of flagella/metal nanoparticle is successfully obtained. A composite film with a TiO 2 /Au(Ag)/TiO 2 sandwich structure is prepared by means of a dip-coating method where a dialyzed TiO 2 solution and flagella stabilized Au and Ag nanoparticles are used as raw materials. TEM and UV-visible spectroscopy characterizations reveal that the sandwich structures play a role in stabilizing metal nanoparticles in the composite films and visible light photocatalytic activity is attributed to the existence of Au and Ag nanoparticles.