Abstract
We report that hollow spheres of transition metal oxides (TiO2, ZrO2, SnO2, Fe2O3, and Co3O4) could be formed in flowing aerosols. The formation of hollow structures was attributed to the in situ emission of gas phase HBO2 from the inner part of the metal oxide microspheres during the pyrolysis of flowing aerosols. We interestingly found that the addition of H3BO3 could not only result in the formation of hollow spheres but also tailor the property of the metal oxides. The resulting TiO2 and Co3O4 hollow spheres exhibited enhanced photocatalytic and magnetic properties compared to the counterpart solid spheres, respectively. We believe this study provides a simple and convenient method for industrial production of transition metal oxide hollow spheres with enhanced properties.
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