Dr. Jason I. Ridley Profile

Dr. Jason I. Ridley

at Materion Precision Coatings

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Proceedings Article | 21 September 2007 Paper

Robust antireflection coatings By UV cross-linking of silica nanoparticles and diazo-resin polycation

Jason Ridley, James Heflin, Alfred Ritter

Proceedings Volume 6674, 667406 (2007) https://doi.org/10.1117/12.734515

KEYWORDS: Nanoparticles, Silica, Antireflective coatings, Adhesives, Mass attenuation coefficient, Ultraviolet radiation, Multilayers, Refractive index, Composites, Particles

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Antireflection coatings have been fabricated by self-assembly using silica nanoparticles. The ionic self-assembled multilayer (ISAM) films are tightly packed and homogeneous. While the geometric properties of a matrix of spherical particles with corresponding void interstices are highly suitable to meet the conditions for minimal reflectivity, it is also a cause for the lack of cohesion within the constituent body, as well as to the substrate surface. This study investigates methods for improving the interconnectivity of the nanoparticle structure. One such method involves UV curing of diazo-resin (DAR)/silica nanoparticle films, thereby converting the ionic interaction into a stronger covalent bond. Factorial analysis and response surface methods are incorporated to determine factors that affect film properties, and to optimize their optical and adhesive capabilities. The second study looks at the adhesive strength of composite multilayer films. Films are fabricated with silica nanoparticles and poly(allylamine hydrochloride) (PAH), and dipped into aqueous solutions of PAH and poly(methacrylic acid, sodium salt) (PMA) to improve cohesion of silica nanoparticles in the matrix, as well as binding strength to the substrate surface. The results of the two studies are discussed.

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