A rational design of double layer mesoporous polysiloxane coatings for broadband antireflection
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For the purpose to realize broadband antireflection on glass substrates, double layer mesoporous polysiloxane coatings were well designed by solving Maxwell equation and prepared through sol–gel dip-coating method using tri-block copolymer (EO20PO70EO20) as porogen. The obtained double layer coatings revealed broadband antireflective performance within wavelength range from 400 to 900 nm with a maximum transmittance of 99.2 % around 520 nm, which was in well agreement with the calculated results. The mesopore structure was confirmed by AFM and N2 adsorption–desorption measurement. Moreover, it was found that the outer layer of resultant coatings showed increased hydrophobicity along with increased temperature. Hence, we proposed that the condensation degree of silica network played an important role on the surface wettability of polysiloxane coatings, which was fully investigated with the assistance of FT-IR and water contact angle measurements.
KeywordsAntireflective coatings Sol–gel Dip-coating Polysiloxane Mesoporous structure Maxwell equation
This research was financially supported by the Nanotech Foundation of Science and Technology Commission of Shanghai Municipality (No. 0652nm001), the National Natural Science Foundation of China (No. 21006025), and the Fundamental Research Funds for the Central Universities. Furthermore, sincere thanks go to Prof. Xinling Wang from Shanghai Jiaotong University for his great assistance to the Ellipsometer measurement.
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