Fabrication of polycrystalline aluminum oxide thin films via hydrolysis and hydrothermal reactions in solutions

Polycrystalline Al(2)O(3) thin films were fabricated through a method combining urea hydrolysis and hydrothermal reactions. The overall growth temperature of these films was achieved as low as 150 degrees C. Although cracks occurred across the gel film after hydrolysis, a subsequent nucleation under elevated pressure and temperature resulted in a closely packed morphology. Moreover, the hydrothermal treatment led to high oxide content and an increase in crystallinity within the films. (C) 2011 Elsevier B.V. All rights reserved.