Abstract
ZnO 2 nanoparticles were synthesized via a green hydrothermal method using ZnO powder and 30% H 2O 2 aqueous solution as the starting materials, and characterized by X-ray diffraction (XRD), Raman spectra, energy dispersive X-ray (EDX) spectra, field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and room temperature photoluminescence (RTPL) spectra. It was found that suitable reaction temperature (e.g., 80–140 °C) played an important role in obtaining pure cubic phase ZnO 2 nanoparticles. The RTPL spectra disclosed that the as-synthesized ZnO 2 nanoparticles exhibit one strong emission band centered at around 400 nm and one very weak emission band at around 474 nm, which may have originated from the band edge emission and the oxygen vacancy, respectively.
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