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以钨酸钠为钨源,通过添加苹果酸诱导剂,利用水热法合成花状WO3粉体。所得产物用XRD,SEM和TEM等手段进行结构和形貌表征,并用紫外-可见(UV-Vis)漫反射光谱仪及测色计测试光致变色性能。结果表明,未添加和添加苹果酸诱导剂合成的WO3粉体均为六方相,未添加苹果酸的WO3粉体是粒度为200~300nm的无规则块状颗粒,以苹果酸为诱导剂合成的WO3粉体是由许多直径为300~500nm,厚度在20~30nm的纳米片层层叠加,彼此交错而成的花状结构。这种花状结构增大WO3粉体的比表面积,增强其对光子的捕获能力,提高对光的利用率,从而优化WO3粉体的光致变色性能。
Using sodium tungstate as a tungsten source, flower-like WO3 powder was synthesized by hydrothermal method by adding malic acid inducer. The obtained product was characterized by XRD, SEM and TEM. The photochromism was tested by UV-Vis diffuse reflectance spectrophotometer and colorimeter. The results showed that the WO3 powder synthesized without or with malic acid inducer was hexagonal. WO3 powder without malic acid was a random agglomerate with a particle size of 200-300 nm, and was synthesized with malic acid as an inducer The WO3 powder is a flower-like structure in which a plurality of nanosheets having a diameter of 300 to 500 nm and a thickness of 20 to 30 nm are stacked and interlaced with each other. The flower-like structure increases the specific surface area of the WO3 powder, enhances its ability to capture photons, increases the utilization of light, and optimizes the photochromic properties of the WO3 powder.