溶胶-凝胶法制备SiO2/SiO2-TiO2双层防雾增透膜

Sol-gel Preparation of Anti-Fogging SiO2/SiO2-TiO2 Double-layer Antireflective Coating

以本征机械性能良好的溶胶-凝胶酸催化SiO2和TiO2薄膜为基础,设计并制备了具有高透过率和良好机械性能的λ/4-λ/4 Si O2/Si O2-TiO2双层增透膜.所得薄膜在中心波长处的峰值透过率达到99.9%,与设计膜层的透过率曲线高度吻合.经耐摩擦和黏附性测试后,该双层增透膜峰值透过率基本保持不变,硬度高达4H,表明其具有良好的机械性能.水表面接触角测试结果显示该双层增透膜具有超亲水性,表现出良好的冷/热防雾效果.

SiO2/SiO2 TiO2 double layer antireflective(AR)coating with high transmittance and excellent mechanical property was designed and prepared by sol gel method based on the intrinsically robust sol gel acid catalyzed SiO2 and TiO2 thin films.It was found that the maximum transmittance of the obtained double layer antireflective coating reached 99.9%,well in accordance with the simulated one.After abrasion and hardness test,the transmittance spectra all changed little compared with the original one;and this double layer AR coating could withstand the 4H pencil hardness test,showing an excellent mechanical property.Moreover,this double layer coating was superhydrophilic,hence the coating possessed excellent anti fogging property.The high transmittance,excellent mechanical and anti fogging property make this double layer SiO2/SiO2-TiO2 AR coating an alternative candidate in the field of solar cells.