A simple route to prepare crack-free thick antireflective silica coatings with improved antireflective stability

作者：Zhang, Yulu; Zhang, Xinxiang; Ye, Haiping; Xiao, Bo; Yan, Lianghong; Jiang, Bo^*

来源：Materials Letters, 2012, 69: 86-88.

DOI：10.1016/j.matlet.2011.11.043

• Antireflective coating
• Sol-gel preparation
• Thick films
• Crack-free
• PDMS
• Antireflective stability

In this study, a simple route was proposed to prepare crack-free thick antireflective (AR) silica coatings with improved abrasion resistance and AR stability. Using tetraethylorthosilicate (TEOS) as precursor and hydroxyl-terminated polydimethylsiloxane (PDMS) as modifier, silica AR coatings were prepared by sol-gel process with dip-coating method. It is found that the addition of PDMS extends the adjustable range of sol viscosity, and allows the preparation of thick coatings by a simple route. PDMS prevents the thick AR coating from cracking and enhances its abrasion resistance due to the enhanced particle-to-particle bond strength and the reduced stress inside the film. The hydrophobicity of the coating is also improved by the introduction of hydrophobic methyl groups, and the measured water contact angle increases from 23.4 to 75.3. Thick crack-free AR coatings with good abrasion resistance and antireflective stability can be prepared by this simple route.

• 出版日期2012-2-15
• 单位四川大学; 中国工程物理研究院激光聚变研究中心; 中国工程物理研究院