PVB掺杂有机无机复合SiO2增透膜的制备和表征

以聚乙烯醇缩丁醛(PVB)为有机掺杂剂，正硅酸乙酯为前驱体，氨水为催化剂，利用溶胶-凝胶法制备出了一种新型的有机无机复合二氧化硅增透膜。采用红外光谱、X射线衍射、粒度分析、紫外分光光度法、椭偏测定、原子力显微镜、静滴接触角测量等对膜层性质进行了表征。结果表明：PVB分子的引入并没有引起增透膜结构的变化。在相同的实验条件下，未经PVB掺杂的SiO₂增透膜在720 nm处的峰值透过率为99.8％，而PVB掺杂后的SiO₂复合膜在840 nm处的峰值透过率在99.9%以上。掺杂膜层变厚，峰值透过率朝长波方向移动。掺杂前后增透膜对水的接触角从29°增加到71°，膜层的疏水性得到明显提高。

Preparation and Characteration of Polyvinyl Butyral(PVB) Doped Organic-Inorganic Hybrid Silica Antireflective Coatings

An organic-inorganic hybrid silica antireflective(AR) coating was prepared by base catalyzed sol-gel proc-esses using tetraethylorthosilicate(TEOS) as precursor and polyvinyl butyral(PVB) as organic modifier. The structural, optical and morphological properties of the hybrid AR coating were investigated with FTIR, XRD, particle size analyzer, UV-Vis spectrophotometry, spectroscopic ellipsometry, atomic force microscope(AFM), and contact angle measurement. The results show that the structural property of the AR coating does not change with the addition of PVB. In the same experimental condition, maximum transmission occurs at 720 nm for normal AR coating, and the transmission reaches nearly 100% at 840 nm for PVB doped AR coating. The displacement of the maximum transmittance towards longer wavelength is due to higher thickness of the PVB doped AR coating. Compared to undoped silica coating, the contact angle of PVB doped AR coating increased from 29° to 71° indicating a higher hydrophobicity of PVB doped AR coating.