Lu Chung-Hsin, Wu Wei-Hong, Kale R B
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
J Hazard Mater. 2007 Aug 17;147(1-2):213-8. doi: 10.1016/j.jhazmat.2006.12.068. Epub 2007 Jan 4.
TiO2 thin films with a monophasic anatase structure were synthesized via a high-pressure crystallization (HPC) process which successfully lowered the crystallization temperature of TiO2 films from 350 to 150 degrees C. The thermal budget and energy consumption during the crystallization process were markedly reduced and dense films without cracks were obtained. During the HPC process, crystallization took place throughout the films and TiO2 films with uniform crystallinity were obtained. The HPC process also led to an enhancement in the wettability of TiO2 thin films. The hydrophilicity of the films increased with heating temperatures via high-pressure annealing. In comparison with the conventional annealing, the HPC process not only produced TiO2 films with superior photo-induced super-hydrophilicity, but also led to higher photocatalytic activity of the films. The HPC process was confirmed to provide a new route for synthesizing well-crystallized anatase TiO2 thin films with high photocatalytic activity and good wettability at low temperatures.
通过高压结晶（HPC）工艺合成了具有单相锐钛矿结构的TiO₂薄膜，该工艺成功地将TiO₂薄膜的结晶温度从350℃降低到150℃。结晶过程中的热预算和能耗显著降低，并且获得了无裂纹的致密薄膜。在HPC过程中，整个薄膜都发生了结晶，获得了具有均匀结晶度的TiO₂薄膜。HPC工艺还提高了TiO₂薄膜的润湿性。通过高压退火，薄膜的亲水性随加热温度的升高而增加。与传统退火相比，HPC工艺不仅制备出具有优异光致超亲水性的TiO₂薄膜，而且还使薄膜具有更高的光催化活性。证实HPC工艺为在低温下合成具有高光催化活性和良好润湿性的结晶良好的锐钛矿TiO₂薄膜提供了一条新途径。
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