Control of ZnO Morhpology by Solution Route
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Control of ZnO Morhpology by Solution Route Lingdong Sun, Jun Zhang, Chunsheng Liao, Chunhua Yan State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China ABSTRACT In this paper, ZnO with a rich variety of well-defined morphologies have been achieved by solution route using different kind of precursors, which can prepare particles by only one step without calcination. The influences of solvent, and temperature on the particle size and morphology of ZnO were investigated. It was revealed by the scanning electron microscope (SEM) and transmission electron microscope (TEM) images that the morphological feature of ZnO can be controlled as rod-, polyhedron-, fluffy sphere-, snowflake- and flower-like, etc. XRD measurement showed that all of the ZnO samples with different morphologies has the same hexagonal structure, which is well consistent with electron diffraction (ED) characterization. This communication not only provides promising candidates for materials science due to the importance of shape in relationship with materials, but also presents an effective route to synthesize the well-defined inorganic materials. INTRODUCTION More attentions nowadays are paid on studies of the morphology control of inorganic materials, because the properties are liable to be tailored for diversified morphologies [1]. Except for focusing on sulfide or selenide nanocrystals [2-6], the studies on diversity of oxides, especially ZnO, are going on. ZnO, as a wide band gap semiconductor, has been investigated both in fundamental and application studies [7-9]. The reports of ZnO with controlled size and morphology emerged endlessly in order to fine-tune the properties for practical applications, especially to realize the novel lasing effect [10]. Hydrothermal synthesis [3,11], as a mild reaction route, can be performed at a relatively lower temperature to produce the sufficiently crystallized products without further calcination. Previous works were extremely focused on the influence of the reaction condition on size of as-prepared ZnO, or on the simple morphologies, such as sphere- or rod-like ZnO particles [12]. In this communication, hexagonal structured ZnO with a rich variety of well-defined morphologies, have been obtained by solution routes. Some of the morphologies shown the fractal patterns and may have the potential applications for strong light scattering and localization, which are important for lasing [13]. The influences of temperature, and solvent on the particle size and morphology of ZnO were investigated.
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EXPERIMENTAL DETAILS The zinc precursor solution containing Zn(OH)42- or Zn(NH3)42+ was prepared by adjusting the pH of zinc acetate solution (ZnAc2, 0.50 mol/L) with NaOH or ammonia to 14 and 10, respectively. The precursor was transferred into a 25 mL teflon-lined autoclave and heated to a certain temperature for a given time to form ZnO. After cooled to room temperature, the wh
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