Generation of wet-chemical AR coatings on plastic substrates by the use of polymerizable nanoparticles

Peter William Oliveira; Herbert Krug; A. Frantzen; Martin Mennig; Helmut K. Schmidt

doi:10.1117/12.284139

2 October 1997 Generation of wet-chemical AR coatings on plastic substrates by the use of polymerizable nanoparticles

Peter William Oliveira, Herbert Krug, A. Frantzen, Martin Mennig, Helmut K. Schmidt

Proceedings Volume 3136, Sol-Gel Optics IV; (1997) https://doi.org/10.1117/12.284139
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Multi-layer interference filters of surface modified SiO₂- and TiO₂-nanoparticles have been produced on polycarbonat (PC) and on scratch resistant film. AR-coatings (anti-reflex- coatings) were prepared from a dispersion of SiO₂ and TiO₂ colloidal nanoparticles in a hybrid inorganic organic matrix. The TiO₂ particles have been synthesized by addition of HCl and H₂O to a solution of titanium tetraisopropanolate in isopropanol. The SiO₂ nanoparticles were synthesized by base catalyzed hydrolyses and condensation of tetraethoxysilane (TEOS) mixed with an aqueous solvent. The surface modification of the TiO₂ and SiO₂ nanoparticles with 3-glycidoxypropyltrimethoxysilane (GPTS) avoids the agglomeration of the nanoparticles and covalent bonds between the matrix and nanoparticles are formed during a photopolymerization step. The nanoparticles were dispersed in a hydrolyzed GPTS matrix and UVI Cygacure 6974 was added as a photoinitiator. The (lambda) /4 ((lambda) equals 550 nm) films of TiO₂ and SiO₂ sols were prepared on PC and on scratch resistant coated PC by spin-coating techniques. The refractive index of the SiO₂/TiO₂-coatings can be adjusted from 1.47 up to 1.94 depending on the SiO₂ or TiO₂ concentration. By the combination of index matching and photopolymerization, a low temperature interference filter can be realized for plastic substrates with reflection of 0.5% at 550 nm. The coatings show excellent adhesion to the substrates in the cross hatch test and promising mechanical properties.

Citation Download Citation

Peter William Oliveira, Herbert Krug, A. Frantzen, Martin Mennig, and Helmut K. Schmidt "Generation of wet-chemical AR coatings on plastic substrates by the use of polymerizable nanoparticles", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); https://doi.org/10.1117/12.284139

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