Vacuum ( IF 4 ) Pub Date : 2021-07-15 , DOI: 10.1016/j.vacuum.2021.110457 George Tzvetkov 1 , Martin Tsvetkov 1 , Tony Spassov 1
Here, a single-step wet-chemical synthetic approach to fabricate novel hierarchically-structured edelweiss-like ZnO microparticles is reported. The construction of microparticles with an average size of 2.7 μm was accomplished within 3 min via hydrolysis of tetraamminezinc (II) complex at dynamic underwater Leidenfrost conditions. The possible formation mechanism of the microparticles was discussed and their microstructural and optical properties were examined. Photoluminescence studies at room temperature showed that the as-prepared ZnO possesses an intense UV-violet emission (370–422 nm range), while the low-temperature annealing at 200 °C leads to the predominant UV-violet-blue co-emission. In addition, the relationship between the photoluminescence properties of microparticles and the type of intrinsic defects in ZnO was analyzed.
中文翻译:
具有强紫外-紫光发射的雪绒花状 ZnO 微粒的简便制备
在这里,报告了一种单步湿化学合成方法来制造新型分层结构的雪绒花状 ZnO 微粒。在动态水下莱顿弗罗斯特条件下,通过四氨锌 (II) 复合物的水解,在 3 分钟内完成了平均尺寸为 2.7 μm 的微粒的构建。讨论了微粒的可能形成机制,并检查了它们的微观结构和光学性质。室温下的光致发光研究表明,所制备的 ZnO 具有强烈的紫外-紫光发射(370-422 nm 范围),而在 200°C 的低温退火导致主要的紫外-紫-蓝共发射。此外,还分析了微粒的光致发光特性与ZnO中固有缺陷类型之间的关系。