Synthesis of alcoholic ZnO nanocolloids in the presence of piperidine organic base:: Nucleation-growth evidence of Zn5(OH)8Ac2•2H2O fine particles and ZnO nanocrystals

Piperidine as a new free OH- organic base has been successfully used to prepare Zn-5(OH)(8)(Ac)(2)center dot 2H(2)O particles (named Zn-HDS) or concentrated alcoholic ZnO sols. Considering the applications of Zn-HDS and ZnO compounds, as well as interests of these synthesis mechanisms for fundamental chemistry, such investigations are of importance. This strategy not only allows preparing Zn-HDS compounds at room temperature but also brings evidence of some new nucleation-growth, and permits the preparation of well crystalline ZnO nanocrystals at low temperature (maximum 60 degrees C). It was possible to convincingly prove that the formation of Zn-HDS phase is concomitant to the ZnO nanocrystals formation and that Zn-HDS could be considered as an intermediate initiator of ZnO nanocrystals. A parallel approach was used for the fast screening of the synthesis progress. (C) 2007 Elsevier Inc. All rights reserved.