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采用原子力显微镜(AFM)对不同电泳时间生成的纳米二氧化钛(TiO2)薄膜进行了观测。经过图像处理得到对应的二值化黑白图,基于构型熵这一指标考虑了多重分形分析时标度区间这一重要因素的影响。讨论了TiO2薄膜的表面形貌与多重分形特征,使得不同生长时间的薄膜表面可以较为明显地定量区分开来。随着电泳时间的增大,薄膜的多重分形谱宽Δα逐渐增大,说明对应的表面粗糙度逐渐增大,薄膜的表面形貌逐渐变差。最后得出电泳镀膜的生长效果在电泳时间为50s时较优,并且通过甲醛降解实验得到进一步验证了其光催化效果,为进一步研究薄膜的催化特性提供了较好的定量评价方法。
Atomic force microscopy (AFM) was used to observe the formation of nanosized TiO2 films at different electrophoretic time. After image processing, the corresponding binary black-and-white graph is obtained. Based on the entropy of configuration, the influence of the important factor of scaling interval in multi-fractal analysis is considered. The surface morphology and multifractal characteristics of TiO2 thin films are discussed. The surface of thin films can be quantitatively and clearly distinguished at different growth time. With the increase of electrophoresis time, the multifractal spectral width Δα of the film gradually increases, indicating that the corresponding surface roughness gradually increases, and the surface morphology of the film gradually deteriorates. Finally, the results showed that the growth of electrophoretic coating was better at 50 s and the photocatalytic activity was further verified by formaldehyde degradation experiment, which provided a good quantitative evaluation method for further research on the catalytic properties of the film.