物理化学学报 >> 2007, Vol. 23 >> Issue (08): 1269-1274.doi: 10.3866/PKU.WHXB20070825

研究简报 上一篇    下一篇

BPA对低温制备锐钛矿型TiO2薄膜表面形貌的控制

杨辉; 申乾宏; 高基伟   

  1. 浙江大学材料科学与工程学系, 杭州 310027; 浙江大学绿色建材及应用技术工程研究中心, 杭州 310027
  • 收稿日期:2007-03-21 修回日期:2007-04-10 发布日期:2007-08-03
  • 通讯作者: 杨辉 E-mail:yanghui@zju.edu.cn

Morphology Control of Anatase TiO2 Films Prepared at Low Temperature Using 4,4’-isopropylidenediphenol

YANG Hui; SHEN Qian-Hong; GAO Ji-Wei   

  1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China; Green Construction Materials and Applied Technology Engineering Research Center, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2007-03-21 Revised:2007-04-10 Published:2007-08-03
  • Contact: YANG Hui E-mail:yanghui@zju.edu.cn

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摘要： 采用4,4’-二羟基二苯基丙烷(BPA)作为TiO2薄膜表面形貌控制的模板剂. 将BPA的乙醇溶液与具有锐钛矿晶粒的TiO2溶胶均匀混合制得涂膜液, 采用浸渍提拉法制备薄膜; 用无水乙醇将薄膜中的BPA选择性溶解去除, 实现了低温下锐钛矿型TiO2薄膜的制备及其表面形貌的调控. 采用SEM考察了TiO2溶胶用量、BPA用量、以及无水乙醇用量等因素对TiO2薄膜表面形貌的影响, 并对其控制机理进行了探讨. 结果表明, 涂膜液的组成会影响到湿膜烘干过程中粒子的迁移和聚集, 从而改变TiO2与BPA 在薄膜表面的分布状态, 最终对TiO2薄膜的表面形貌产生影响. 随BPA浓度的降低,其影响逐渐由薄膜内部转向薄膜的表面区域. 而低TiO2胶粒浓度和高乙醇含量则有利于TiO2薄膜产生粗糙的形貌或多孔性的结构.

关键词: 锐钛矿, 二氧化钛薄膜, 表面形貌, 低温制备

Abstract: 4,4’-isopropylidenediphenol (BPA) was used as a template to control the surface morphology of TiO2 films. A solution was produced by evenly stirring the mixture of the BPA ethanol solution and the TiO2 sol containing anatase grains. The films was prepared from resultant solution by a dip-coating technique, and then the BPA was preferentially extracted by anhydrous ethanol. So the anatase TiO2 films were obtained at low temperature, and the control of the surface morphology of the films was also achieved. Scanning electron microscopy (SEM) was adopted to analyze the influence of the dosage of TiO2 sol, BPA, and the anhydrous ethanol on the morphology of the films, and the control mechanism was also discussed. The results showed that the composition of the solution could affect the move and the aggregation of particles in the drying process of wet films, and thus change the distribution of TiO2 and BPA on the surface of the films, and ultimately influence the surface structure of TiO2 films. With the decrease of BPA concentration, the effect region of BPA was changed from the inside region of the film to the surface region of the film. Low concentration of TiO2 colloidal particle and high content of ethanol were propitious to form rough morphology or porous structure.

Key words: Anatase, Titania film, Surface morphology, Low temperature preparation