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The hexagonal ZnO micro-cups and micro-rings assembled by nanoparticles have been successfully synthesized via a template-free hydrothermal synthetic method, using only one reactant Zn(CH3COO)2·2H2O, which not only serves as the zinc source, but also provides an effective etchant CH3COOH that plays a strategic role in the formation of these ZnO hollow structures.
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Lian et al. (2011) studied this question.
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