水系ハフニアゾルの塗布性に対するステンレス基板表面処理の効果

概要

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It has so far not been possible to fabricate a sol-gel-derived hafnia film with a uniform surface by spin-coating an aqueous hafnia sol on a stainless steel substrate. The reason is that the substrate repulses the sol because of the latters high surface energy. To improve the wettability and coating properties of the sol on the substrate, the authors degreased the substrate in a strong basic solution with and without the application of a 2-A electric current prior to the spin-coating process. After the surface treatment, it was found by atomic force microscopy and temperature programmed desorption analysis, respectively, that the surface roughness and the amount of water adsorbed on the substrate surface increased. The water and hafnia sol droplet contact angles on the substrate deceased. Thus, the sols were wetted and spread well on the surface-treated substrates during the spin-coating process, resulting in sol-gel-derived hafnia films with uniform and flat surfaces.
2007-04-01