Hydrothermal preparation of nanocrystalline ZnO2

Nanocrystalline ZnO2 powder was synthesized via hydrothermal treatment of Zn5(CO3)2(OH)6 powder in 6 vol% H2O2 aqueous solution at 80-120 °C for 6-18 h. The as-synthesized ZnO2 nanocrystals exhibited a strong photoemission band in the visible region of 525-570 nm upon laser excitation at 325 nm.