根据膜层设计理论设计出以K9玻璃为基体的耐环境性的双层增透膜,这种增透膜在特定波长处具有超高的透过率.以盐酸为催化剂,分别以正硅酸乙酯和钛酸丁酯为前驱体制备了SiO2和TiO2溶胶,将SiO2和TiO2溶胶按一定比例混合得到SiO2 -TiO2复合溶胶.通过改变复合溶胶中SiO2的含量调节复合膜的折射率,通过改变提拉速度控制薄膜的厚度.实验结果表明,双层增透膜在550 nm处的透过率达到99.9％.增透膜经较强机械摩擦后峰值透过率基本保持不变,表明该增透膜具有优良的耐摩擦性.进一步采用六甲基二硅氮烷对增透膜表面进行修饰,修饰后增透膜的接触角增大至98.3°,增透膜的疏水性及环境稳定性得到较大提高.%Double-layer antireflective(AR) coatings on K9 glass with excellent environmental resistance and abrasion-resistance were designed and prepared. Using tetraethylorthosilicate ( TEOS ) and titanium tetraiso-propoxide(TTIP) as precursor, respectively, SiO2 and TiO2 sols were prepared via sol-gel process with hydrochloric acid as catalyst. SiO2-TiO2 composite films were prepared by mixing the SiO2 and TiO2 sols and then dip-coating on the substrates. The refractive indices of the composite films were controlled by adjusting the SiO2/TiO2 ratio and the thickness was controlled by adjusting the dip-coating speed. It was found that the maximum transmittance of the double-layer AR coatings reached 99.9% and could be adjusted to match a specific wavelength. The transmittance did not decrease after abrasion test, indicating an excellent abrasion-resistance of the AR coating. Hydroxyl terminated hexamethyldisiloxane ( HMDS) treatment was further performed to improve the hydrophobicity, the environmental resistance and durability of the AR coatings.
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