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采用溶胶-凝胶浸渍提拉法制备MoO3光致变色薄膜。用色差计表征了材料的光致变色性能,并结合X射线衍射、扫描电镜、紫外-可见吸收光谱研究了热处理温度对其微观结构及性能的影响。结果表明:制备的产物为斜方相MoO3;随热处理温度的升高,MoO3薄膜光致变色性能先增后减。当温度为500℃时,薄膜的结晶度最大,颗粒粒径最小,比表面积较大;色差值最大为1.2330。在该温度下激发波长向长波长移动,薄膜的吸收光波区域变宽,从而使MoO3薄膜的光致变色性能提高。
MoO3 photochromic films were prepared by sol-gel dip-coating. The chromatic aberration meter was used to characterize the photochromic properties of the materials. The effects of heat treatment temperature on the microstructure and properties were also studied by X-ray diffraction, scanning electron microscopy and UV-Vis absorption spectroscopy. The results show that the prepared product is rhombohedral MoO3. With the increase of heat treatment temperature, the photochromism of MoO3 films increases first and then decreases. When the temperature is 500 ℃, the crystallinity of the film is the largest, the particle size is the smallest, the specific surface area is larger; the color difference is up to 1.2330. At this temperature, the excitation wavelength shifts to a longer wavelength, and the light absorption region of the film becomes broader, so that the photochromic performance of the MoO3 film is improved.