Preparation of ZnO particles by precipitation transformation method and its inherent formation mechanisms

The ZnO particles were prepared by implementing the precipitation transformation method from Zn5(CO3)2(OH)6 in an aqueous solution at a low temperature (room temperature to 70 °C). The phase transformation process was detected by using a pH-meter and an X-ray diffraction (XRD). With an increase of temperature and concentration and quantity of NaOH solution, the ZnO phase became easier to form, otherwise, the ε-Zn(OH)2 phase would need to be formed. The morphology of ZnO particles and its formation mechanism were investigated. Through controlling the reaction conditions and the post-treatment, the ZnO nanoparticles can be obtained.