Synthesis of plate-like zinc oxide particles by the transcription of precursor's shape

Plate-like zinc contained precursors such as simonkoleite or basic sulphate were successfully synthesized by using equilmolar of Zn²⁺ / hexamethylenetetramine (HMT) acted as precursors, ethylene glycol(EG) as dispersant and surfactant additive, respectively. The reaction solution was sealed in a glass bottle and heated at 95°C for 3h. The zinc contained precursors possessed layered structure and plate-like morphology were successfully synthesized by controlling the zinc ions concentration, reaction temperature, organic solvent additives, anion additives. It was found that plate-like simonkolleite transformed to plate-like ZnO after calcination in air at 400°C, while it transformed to rod-like ZnO under hydrothermal conditions above 140°C. The additive of ethylene glycol decreased the particle size and affected the particle size distribution. The conductivity of the pressured powders was improved by small amount of Ga and Al doping followed by H ₂ reduction treatment at 500°C for 1h.