Abstract
Nanostructured ZnO powders with various morphologies have been prepared by the hydrothermal and chemical precipitation methods. Our results reveal that these nanostructured ZnO particles exhibit obvious room-temperature ferromagnetism, while microbipods show paramagnetic behavior. Photoluminescence spectra indicate that oxygen vacancies (Vo) exsit in these nanostructured ZnO particles. The polarized impurity band associated with Vo defects provides the necessary ferromagnetic coupling, and the variable concentrations of Vo result in the tunable magnetic behaviors in these nanostructured ZnO particles.
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