Patent ID: 8383286

Claim:
A method for manufacturing a metal oxide thin film structure, comprising the steps of: (1) preparing a metal oxide salt solution containing a first metal oxide selected from the group consisting of zirconium oxide, cerium oxide, lanthanum gallate, barium cerate, barium zirconate, bismuth oxide, and doped forms thereof; (2) dispersing a nanopowder of a second metal oxide selected from the group consisting of zirconium oxide, cerium oxide, lanthanum gallate, barium cerate, barium zirconate, bismuth oxide, and doped forms thereof, into a portion of the metal oxide salt solution, to prepare a metal oxide powder dispersed sol; (3) coating a porous substrate with the metal oxide powder dispersed sol; (4) coating the resulting substrate with the metal oxide salt solution prepared in step (1); and (5) sintering the resulting substrate to prepare a metal oxide thin film structure, wherein two or more metal oxide powder dispersed sols having different contents are prepared in step (2); and the porous substrate employed in step (3) is coated therewith at different degrees, and wherein the amount of the nanopowder of second metal oxide is at most 20 wt % based on the total weight of the metal oxide powder dispersed sol.