Zinc peroxide (ZnO 2 ) hollow spheres of 100-200 nm diameter were synthesized by a simple hydrothermal method by using H 2 O 2 and ZnO powder as reagents without the assistance of any surfactant. O 2 bubbles in situ generated by the decomposition of H 2 O 2 served as a soft template in the formation of ZnO 2 spheres. Zinc oxide (ZnO) hollow spheres were obtained by heat treatment of ZnO 2 hollow spheres at 180 °C for 10 h in air. The products were characterized by XRD, FT-IR, TEM, HRTEM, and FESEM. The transition temperature of ZnO 2 to ZnO was determined to be 229 °C by TG-DTA. Photoluminescence (PL) properties of the products were investigated and the origin of the two peaks at 392 and 448 nm in the PL spectrum of ZnO 2 was discussed. Furthermore, the growth mechanism of the ZnO 2 hollow spheres was discussed in detail.

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