Patent ID: 7604839
Filing Date: 2009-10-20
Classification: C23C

Abstract:
1. A process of preparing a uniform highly ordered metal oxide film comprising: preparing a homogeneous solution comprising a suitable solvent, a soluble metal precursor, and a soluble polymer selected from the group consisting of polyethyleneimine, carboxylated polyethyleneimine, other PEI derivatives, polyacrylic acid, polypyrrolidone, and poly(ethylene-maleic acid), the homogeneous solution having a pH in a range of from about 4 to about 9; purifying and concentrating the homogeneous solution by diluting it and thereafter passing a resulting diluted homogeneous solution through an ultrafiltration membrane, whereby impurities pass through the ultrafiltration membrane in a filtrate and a purified and more concentrated homogeneous solution is retained by the ultrafiltration membrane; coating a substrate with the purified and concentrated homogeneous solution, thereby forming a polymer and metal containing layer thereon; and heating said substrate in an oxygen-containing atmosphere at temperatures and for time characterized as sufficient to remove said polymer from said polymer and metal containing layer and form a uniform highly ordered metal oxide film.