ZnO crystals were synthesized from basic aqueous solutions including zincate ions stabilized with triethanolamine by heating at 60°C. The influence of the basicity of the solutions on the morphology of the ZnO crystals was examined. Aqueous solutions were prepared. When the clear solutions, in which glass or polyester substrates were placed, were heated at 60°C, agglomerates of ZnO crystals were deposited on the substrates in the TMAOH / Zn range from 3.0 to 3.6. With increasing the TMAOH / Zn ratio, the shape of the resulting ZnO crystals changed from a short asymmetric column with a hexagonal flat edge and a rounded one, through a rocket-like shape formed by intergrowth, to a hexagonal rod. Although no films of ZnO were formed, ZnO crystals with different shapes were synthesized. When the glass substrates pre-coated with a ZnO thin film by a sol-gel method were used, highly oriented, dense ZnO films were formed. The films consisted of rod-like crystals aligned normal to the substrate surface.

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