用双络合剂制备超亲水多孔TiO_2薄膜

Superhydrophlic Porous Structures of TiO_2 Films Prepared with Complexing Agents

用一种新的方法制备了含有多孔结构的TiO_2薄膜。在前驱液中加入络合剂乙酰丙酮(ACAC)和二乙醇胺(DEA)时薄膜中出现孔状结构,而只加入络合剂ACAC时则没有孔出现。推测了孔状结构产生的可能机理,由2种络合剂混合得到的圆孔被认为是由溶液体系中迅速形成的低聚物相与溶剂相二相分离所引发。XRD表征分析得出在500℃烧结得到的TiO_2薄膜呈锐钛矿晶型,并且该薄膜的透光率高达83%。润湿性测试表明多孔结构的出现提高了薄膜的亲水性,水在薄膜上的接触角由15.6°减小到6.5°,接近超亲水范围。

A novel method is developed to produce a TiO2 film with circular pores on its surface. The pores arising from the precursor solution using both acetylacetone and diethanolamine as eomplexing agents without adding surfactants as pore generators,while non-circular pores are detected when only using one complexing agent ACAC as chelating agent. Comparing the films obtained from the two routes, the appearance of circular pores for the film synthesized with the mixture of two complexing agents is generated by phase-separation. The crystal structure of the TiO2 films sintered at 500℃ is in anatase form by X-ray diffraction pattern analysis, and the transmittance spectrum give a high transmittance of 83% in the visible region. The hydrophilic of the film is enhanced because of the circular pores. The contact angle decreases from 15. 6° to 6.5° which is close to the range of superhydrophilic.