论文部分内容阅读
通过对胶体晶体模板的反向复制,制备了反点阵列孔径各异的Au/TiO2复合薄膜.采用SEM,AFM,XRD,UV-Vis和四探针测试仪等手段对复合薄膜的结构和光催化性能进行了表征.通过对胶体晶体模板和反点阵列几何模型的计算,讨论了Au反点阵列在TiO2薄膜表面的覆盖面积与模板中微球粒径的关系.结果表明:反点阵列孔径对复合薄膜的光催化性能有显著影响.孔径增大,使反点阵列的导电性能提高,载流子的输运效率增强,促使光催化性能的提高;同时,孔径增大又造成光生电子向反点阵列迁徙过程中的复合几率加大,反而使光催化性能降低.2种作用共同导致了Au/TiO2复合薄膜的光催化性能随Au反点阵列孔径的增大出现先提高后降低的变化规律,并在孔径为3.3μm时达到最高.
The Au / TiO2 composite films with different pore sizes were prepared by reversing the colloidal crystal template. The structure and photocatalytic activity of the composite films were investigated by SEM, AFM, XRD, UV-Vis and four-probe tester The relationship between the coverage area of TiO2 thin film surface and the size of microspheres in the template was discussed.The results show that the ratio of the inverse array aperture The photocatalytic performance of the composite film has a significant impact.With the increase of pore size, the conductivity of the reverse array increases, carrier transport efficiency increases, prompting the improvement of photocatalytic properties; the same time, The recombination probability increases during the migration of dot array, but decreases the photocatalytic performance, which leads to the change of the photocatalytic activity of the Au / TiO2 composite film first increasing and then decreasing with the increase of the Au inverse lattice array pore size , And reach the highest when the aperture is 3.3μm.