Chemical Kinetics For Controlled Synthesis Of Mg-doped ZnO Nanocrystals

We reported a quantitative method based on FTIR to study the chemical kinetics of the alcoholysis reactions associated with the formation of Mg-doped zinc oxide nanocrystals. The correlations between the chemical kinetics of the precursor conversion reactions and the morphologies and properties of the doped oxide nanocrystals were investigated. The understanding underpins the advancement of the synthesis of doped nanocrystals and should be useful for future rational design of new synthetic systems.The main contents are as follows:1. We studied the chemical kinetics of alcoholysis reaction associated with the formation of pure ZnO and MgO nanocrystals. FTIR was employed to quantitatively measure the corresponding chemical kinetics parameters.2. Changing the ratio of Zn(St)2to Mg(St)2and the reaction temperature to synthesize doped nanocrystals with different morphologies and properties. Based on the experimental results, we show that the ultrathin nanowires were obtained by adjusting the relative reactivity of Zn(St)2to Mg(St)2. The morphologies and properties of the doped nanocrystals are affected by the relative reactivity of Zn(St)2to Mg(St)2which is determined by the reaction temperature and dopant ratio. Therefore, we can get ultrathin nanowires by adjusting the reaction conditions. Meanwhile, we also verified that the ultrathin nanowires exhibited almost identical properties.3. We employed another two kinds of zinc carboxylate as precursors to study the reaction kinetics. The obtained kinetics data were used to guide the synthesis of ultrathin nanowires, revealing that our understanding can be used to guide the synthesis of doped nanocrystals with well-defined shapes and properties. Furthermore, we found that adding free acid as additional coordination ligands did not change the morphology and properties of the products.