Abstract: The powders of gel precursors were prepared by using the stearic acid, the citric acid and oxalate gel methods, respectively.And nanometer ZnO was obtained through calcination at the appointing temperature base on the data of thermal analysis of the gel precursors.The XRD and SEM showed that the three methods could be used to synthesise hexagonal ZnO nanometer powder, compare with other methods, ZnO nanometer powder prepared by the first method has higher crystal linity, better dispersity with sphere-shaped.

Key words: Sol-gel method, precursor, nanometer ZnO