WO3·(H2O)0.33 hierarchical microstructures such as micro-nutlets, micro-flowers, and micro-discs have been successfully prepared via a facile microwave-assisted solvothermal route employing Na2WO4·2H2O and hydrochloric acid as precursors and disodium ethylenediaminetetraacetic (Na2H2EDTA) as a structure-directing agent. The products have been characterized by X-ray powder diffraction (XRD), energy dispersive X-ray analysis (EDS) scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The influences of reaction time, temperature, the volume ratio of water and glycerol, and the amount of Na2H2EDTA and hydrochloric acid on the morphologies have been studied in detail. A possible growth mechanism was proposed.
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