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首页> 外文期刊>Chemistry: A European journal >One-Pot Template-Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties
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One-Pot Template-Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties

机译：一锅无模板的单分散硫化锌空心球的合成及其光催化性能

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摘要

Monodisperse wurtzite ZnS hollow spheres with diameters of about 200 rim and shells composed of nanoparticles have been successfully synthesized in high yield by a one-pot template-free hydrothermal route. The reaction duration, reactant species, and reaction temperature have been shown to play important roles in the formation of ZnS hollow spheres. X-ray diffraction, scanning and transmission electron microscopy, nitrogen adsorption/desorption, UV/Vis diffuse reflectance spectroscopy, and photoluminescence were used to characterize the products. The results show that all the prepared nanospheres have hexagonal wurtzite structures and exhibit good size uniformity and regularity. A mechanism for the formation of the ZnS hollow spherical Structure by localized Ostwald ripening has been proposed based on experimental observations. In addition, studies of the photocatalytic properties of the ZnS hollow spheres by exposure to UV irradiation have demonstrated that they have potential photocatalytic applications. Hydroxyl radicals ((OH)-O-center dot) were not detected on the surface of UV-illuminated ZnS by the photoluminescence technique, which suggests that (OH)-O-center dot is not the dominant photo-oxidant and a photogenerated hole could instead directly participate in the photocatalytic reaction. The prepared ZnS hollow spheres are also of great interest for use in flat displays, sensors, lasers, catalysis, separation technology, biomedical engineering, and nanotechnology.
机译：通过一锅法无模板水热法成功地高收率地合成了直径约200的单分散纤锌矿型ZnS空心球和由纳米颗粒组成的壳。已显示反应持续时间，反应物种类和反应温度在ZnS空心球的形成中起重要作用。用X射线衍射，扫描和透射电子显微镜，氮吸附/解吸，UV / Vis漫反射光谱和光致发光来表征产物。结果表明，所有制备的纳米球均具有六方纤锌矿结构，并具有良好的尺寸均匀性和规则性。基于实验观察，提出了通过局部奥斯特瓦尔德熟化形成ZnS空心球形结构的机理。另外，通过暴露于紫外线辐射下对ZnS空心球的光催化性能的研究表明，它们具有潜在的光催化应用。通过光致发光技术未在紫外线照射的ZnS表面检测到羟基自由基（（OH）-O-中心点），这表明（OH）-O-中心点不是主要的光氧化剂和光生空穴而是可以直接参与光催化反应。制备的ZnS空心球也很感兴趣用于平面显示器，传感器，激光，催化，分离技术，生物医学工程和纳米技术。

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