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Hollow Rodlike MgF2 with an Ultralow Refractive Index for the Preparation of Multifunctional Antireflective Coatings
Langmuir ( IF 3.7 ) Pub Date : 2017-06-16 00:00:00 , DOI: 10.1021/acs.langmuir.7b00737 Lei Bao 1 , Zihan Ji 1 , Hongning Wang 1 , Ruoyu Chen 1
Langmuir ( IF 3.7 ) Pub Date : 2017-06-16 00:00:00 , DOI: 10.1021/acs.langmuir.7b00737 Lei Bao 1 , Zihan Ji 1 , Hongning Wang 1 , Ruoyu Chen 1
Affiliation
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Antireflective coatings with superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength have important practical value. In this research, hollow nanorod-like MgF2 sols with different void volumes were prepared by a template-free solvothermal method to further obtain hollow nanorod-like MgF2 crystals with an ultralow refractive index of 1.14. Besides, a MgF2 coating with an adjustable refractive index of 1.10–1.35 was also prepared by the template-free solvothermal method. Then through the combination of base/acid two-step-catalyzed TEOS and hydroxyl modification on the surface of nanosilica spheres, the SiO2 coating with good mechanical strength, a flat surface, and a refractive index of 1.30–1.45 was obtained. Double-layer broadband antireflective coatings with an average transmittance of 99.6% at 400–1400 nm were designed using the relevant optical theory. After the coating thickness was optimized by the dip-coating method, the double-layer antireflective coatings, whose parameters were consistent with those designed by the theory, were obtained. The bottom layer was a SiO2 coating with a refractive index of 1.34 and a thickness of 155 nm, and the top layer was a hollow rodlike MgF2 coating with a refractive index of 1.10 and a thickness of 165 nm. The average transmittance of the obtained MgF2–SiO2 antireflective coatings was 99.1% at 400–1400 nm, which was close to the theoretical value. The hydrophobic angle of the coating surface reached 119° at first, and the angle further reached 152° after conducting surface modification by PFOTES. In addition, because the porosity of the coating surface was only 10.7%, the pencil hardness of the coating surface was 5 H and the critical load Lc was 27.05 N. In summary, the obtained antireflective coatings possessed superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength.
中文翻译：
具有超低折射率的空心棒状MgF 2用于制备多功能抗反射涂层
具有超疏水性，自清洁性和广谱高透射率特性以及良好的机械强度的抗反射涂层具有重要的实用价值。在这项研究中，通过无模板溶剂热法制备了具有不同空隙体积的中空纳米棒状MgF 2溶胶，以进一步获得具有1.14的超低折射率的中空纳米棒状MgF 2晶体。此外，还通过无模板溶剂热法制备了折射率为1.10–1.35的MgF 2涂层。然后通过碱/酸两步催化的TEOS和纳米二氧化硅球表面的羟基改性相结合，形成SiO 2获得具有良好机械强度，平坦表面和1.30–1.45折射率的涂层。使用相关的光学原理设计了双层宽带抗反射涂层，其在400–1400 nm处的平均透射率为99.6％。通过浸涂法对镀层厚度进行优化，得到了与理论设计相符的双层减反射膜。底层是具有1.34的折射率和155nm的厚度的SiO 2涂层，并且顶层是具有1.10的折射率和165nm的厚度的中空棒状MgF 2涂层。所得到的MgF 2 -SiO 2的平均透射率抗反射涂层在400–1400 nm处为99.1％，接近理论值。涂层表面的疏水角最初达到119°，在通过PFOTES进行表面改性后，该角进一步达到152°。另外，由于涂层表面的孔隙率仅为10.7％，因此涂层表面的铅笔硬度为5H并且临界载荷Lc为27.05N。总之，所获得的抗反射涂层具有超疏水性，自清洁性和宽泛性。光谱高透射率特性和良好的机械强度。
更新日期：2017-06-17
中文翻译：
具有超低折射率的空心棒状MgF 2用于制备多功能抗反射涂层
具有超疏水性，自清洁性和广谱高透射率特性以及良好的机械强度的抗反射涂层具有重要的实用价值。在这项研究中，通过无模板溶剂热法制备了具有不同空隙体积的中空纳米棒状MgF 2溶胶，以进一步获得具有1.14的超低折射率的中空纳米棒状MgF 2晶体。此外，还通过无模板溶剂热法制备了折射率为1.10–1.35的MgF 2涂层。然后通过碱/酸两步催化的TEOS和纳米二氧化硅球表面的羟基改性相结合，形成SiO 2获得具有良好机械强度，平坦表面和1.30–1.45折射率的涂层。使用相关的光学原理设计了双层宽带抗反射涂层，其在400–1400 nm处的平均透射率为99.6％。通过浸涂法对镀层厚度进行优化，得到了与理论设计相符的双层减反射膜。底层是具有1.34的折射率和155nm的厚度的SiO 2涂层，并且顶层是具有1.10的折射率和165nm的厚度的中空棒状MgF 2涂层。所得到的MgF 2 -SiO 2的平均透射率抗反射涂层在400–1400 nm处为99.1％，接近理论值。涂层表面的疏水角最初达到119°，在通过PFOTES进行表面改性后，该角进一步达到152°。另外，由于涂层表面的孔隙率仅为10.7％，因此涂层表面的铅笔硬度为5H并且临界载荷Lc为27.05N。总之，所获得的抗反射涂层具有超疏水性，自清洁性和宽泛性。光谱高透射率特性和良好的机械强度。
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