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Monodisperse ZnO hollow microspheres (ZnO–HMs) with average diameter about 2μm and shell thickness about 300nm were prepared through a facile template-free, glycerol-mediated hydrothermal route. Their structures and morphologies were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy...
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