二甲基甲酰胺对多孔SiO_2薄膜结构和光学性能的影响

在碱性催化条件下正硅酸乙酯的溶胶体系中,引入二甲基甲酰胺(DMF)进行原位共溶胶凝胶,并结合常压干燥工艺制备多孔SiO2增透薄膜。利用Netzsch热分析仪研究了干凝胶在干燥过程中的热稳定性、用扫描电子显微镜(SEM)对样品薄膜的形态结构进行了表征,用分光光度计考察了DMF对膜层增透性能的影响。实验结果表明,DMF能有效防止凝胶的开裂,抑制颗粒团簇的产生,使胶粒聚联成大的网络结构,提高了成膜性能;DMF的加入能提高薄膜的透射率,使膜层在300～1000nm范围内透射率达99%以上。

Effect of N,N-Dimethylformamide on Structure and Optical Properties of Porous Silica Film

Using a base catalysis for the hydrolysis of tetraethyl orthosilicate (TEOS),porous silica antireflective film are prepared by in-situ sol-gel process and normal atmosphere drying with the introduction of N,N-dimethylformamide (DMF).Thermal stability in drying process of the SiO2 sol is studied by Netzsch thermal analyzer;the structure and morphology of these samples are characterized by scanning electron microscope (SEM);the effect on optical properties of porous silicon thin films are measured by spectrop...