鞭毛模板制备贵金属纳米颗粒/TiO2复合薄膜及光催化活性研究 Flagella-Templated Process to Noble Metal Nanoparticles/TiO2 Composite Films and Their Photocatalytic Activity

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TiO2/Au(Ag)/TiO2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。 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 TiO2/Au(Ag)/TiO2 sandwich structure is prepared by means of a dip-coating method where a dialyzed TiO2 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.