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首页> 外文期刊>Crystal growth & design >Hydrothermal Synthesis of ZnO Crystals from Zn(OH)_2 Metastable Phases at Room to Supercritical Conditions
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Hydrothermal Synthesis of ZnO Crystals from Zn(OH)_2 Metastable Phases at Room to Supercritical Conditions

机译：在室温至超临界条件下由Zn（OH）_2亚稳相水热合成ZnO晶体

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摘要

The originality of this work is to highlight the effect of temperature and pressure on the size and morphology of hydrothermal ZnO particles from ambient to supercritical conditions (T > 374 °C and P > 221 bar) using a unique continuous one-step process. Experiments were carried out from zinc nitrate (Zn(NO_3)_2) and potassium hydroxide (KOH) solutions in the ranges of 1?300 bar and 30?400 °C. The as-prepared particles of ZnO (flower, ellipsoid, and sphere) and ε-Zn(OH)_2 (polyhedral) sized from nano to micrometers were characterized by X-ray diffraction and electronic microscopy. The wulfingite phase (ε-Zn(OH)_2) was detected inside some powders especially at room temperature for higher pressures. The proportion of each phase was determined by the quantitative Rietveld analysis. On the basis of Lou?er’s method, ZnO crystals exhibiting a hexagonal structure were considered as cylinders with a diameter D and a height H. The D/H parameter, also known as the aspect ratio, was correlated with electronic microscopy observations to investigate the ZnO nanoparticle morphology evolution according to the temperature and pressure. Thus, a schematic synoptic summarizing these results is presented.
机译：这项工作的独创性是采用独特的连续一步法突出温度和压力对从环境温度到超临界条件（T> 374°C和P> 221 bar）的热液ZnO颗粒尺寸和形貌的影响。从硝酸锌（Zn（NO_3）_2）和氢氧化钾（KOH）溶液在1？300 bar和30？400°C的温度范围内进行实验。通过X射线衍射和电子显微镜表征了制备的ZnO（花，椭圆形和球形）和ε-Zn（OH）_2（多面体）尺寸为纳米至微米的颗粒。在某些粉末内部尤其是在较高压力下在室温下检测到了硫辉石相（ε-Zn（OH）_2）。每个相的比例通过定量Rietveld分析确定。根据Lou？er方法，具有六边形结构的ZnO晶体被认为是直径D和高度H的圆柱体。D/ H参数（也称为纵横比）与电子显微镜观察结果相关，以研究ZnO纳米颗粒的形貌根据温度和压力而变化。因此，给出了总结这些结果的示意图。

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