Hydrothermal Synthesis and UV Irradiation Shielding Per- formances of Nanometer Cerium (IV) Oxide Thin Films

摘要:

以硝酸铈和尿素为原料，采用水热合成法在玻璃基底上制备了具有高反射率和良好抗紫外性能的CeO2薄膜，并采用SEM、XRD、FT-IR、椭圆偏振仪和UV-vis对薄膜和同时制备的粉体进行了表征，研究了Ce(Ⅲ)浓度和尿素加入量对薄膜的影响。结果表明，当Ce(Ⅲ)浓度和尿素加入量较小时，薄膜光滑且沉积颗粒较小，沉积颗粒是CeO2和Ce(CO3)2O·H2O晶体，且玻璃基底中的Si参与了水热反应。薄膜致密度和化学组成影响其反射率，随着Ce(Ⅲ)浓度和尿素加入量增加，由于薄膜厚度和半导体复合的影响，其吸光度和吸收边波长增大，最佳的Ce(Ⅲ)浓度是0.008 mol/L，尿素加入量是0.06 g。

Abstract:

The cerium oxide films with high refractive index and good UV irradiation shielding performance were synthesized on the glass substrates by a hydrothermal method using Ce(NO3)3·6H2O and CO(NH2)2 as raw materials. The films and the powders prepared at the same time were characterized by SEM, XRD, FT-IR, ellipsometer and UV-vis. The influences of original Ce(Ⅲ) concentration and urea dosage on cerium oxide films were researched. The results show that the films are smooth and the particles are small at low Ce(Ⅲ) concentration and urea dose. The sediments are cerium oxide and Ce(CO3)2O·H2O crystal, and silicon of substrate is involved in hydrothermal reaction. Meanwhile, the film refractive indexes are affected by film compact and chemical composition. Both of absorbance and absorption wavelength edge become big with increasing of Ce(Ⅲ) concentration and urea dose, and the main influence factors are the film thickness and composite semiconductors. The optimal Ce(Ⅲ) concentration is 0.008 mol/L, and the optimal urea dosage is 0.06 g.