Nanostructured ZnO network films deposited on A_2O_3 substrates by chemical bath deposition

摘要

Nanostructured ZnO network films have been fabricated on Al_2O_3 substrates by the combination of chemical bath deposition and thermal decomposition process. Layered basic zinc nitrate (LBZN) network films were deposited on the Al_2O_3 substrates with LBZN crystal seeds in methanol solution of zinc nitrate hexahydrate and hexamethylenetetramine. The LBZN precursor films were then transformed into nanostructured ZnO films by heating at 260 ℃ in air. During the thermal decomposition process abnormal exothermic heat effect was observed at 200-210 ℃ and CH_3 groups were found in the as-deposited films. We propose that methanol molecules are integrated in the LBZN films forming LBZN-CH_3OH complex and that the heat effect comes from the exothermic release of the methanol.