Abstract
Porous zinc oxide (ZnO) hollow spheres have been fabricated by calcination of a precursor complex in a furnace. The precursor was precipitated in a chemical solution at 80 °C. The field-emission scanning electron microscope and transmission electron microscope reveal the porous and hollow structure of the samples. The spherical hollow precursor is self-assembled in the solution under the coordination effect of citrate ions and the Kirkendall effect working together. The precursors can be converted to pure ZnO crystals by heating in a furnace above 300 °C. The Brunauer–Emmett–Teller (BET) specific surface area of this sample is 95.4 m2/g. The photocatalytic degradation of methyl blue solution test shows the ZnO hollow spheres have superior photocatalytic activity.
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