Formation of double-cone-shaped ZnO mesocrystals by addition of ethylene glycol to ZnO dissolved choline chloride?urea deep eutectic solvents and observation of their manners of growth
Formation of double-cone-shaped ZnO mesocrystals by addition of ethylene glycol to ZnO dissolved choline chloride?urea deep eutectic solvents and observation of their manners of growth
复制标题
ZnO溶解的氯化胆碱·尿素低共熔溶剂中加入乙二醇形成双锥状ZnO介晶并观察其生长方式
DOI：
10.1039/d1ce01049b
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发表时间：
2021
期刊：
影响因子：
3.1
通讯作者：
Yubuta Kunio
中科院分区：
文献类型：
--
作者：
Wagata Hajime;Harada Ginji;Nakashima Eriko;Asaga Motoki;Watanabe Tomoaki;Tanaka Yuya;Tada Masaru;Yubuta Kunio
ZnO介晶已被探索用于各种物理和化学应用。尽管许多研究人员做出了努力，但仍然难以在环境友好，简单和大规模的制造途径中生长特定的晶体形状。在这项研究中，我们报告了一个简单的制造椭圆形和双锥形状的ZnO介晶沿沿着c轴伸长的离子注入法在氯化胆碱-尿素低共熔溶剂（CU-DES）添加乙二醇（EG）。结果表明，在Cu-DES体系中，ZnO的溶解量高达16.7%（质量分数），在高温下形成锌氰酸盐络合物。添加EG到上述浓缩的ZnO溶解的CU-DESs引起沉淀的ZnO颗粒，其被确认为介晶与透射电子显微镜图像和选区电子衍射图案。研究了Cu-DES中晶体的生长过程和形状演化。紫外光激发下的光致发光研究表明，ZnO介晶具有较强的紫外光发射和较弱的可见光发射，表明其具有较高的晶体质量。
ZnO mesocrystals have been explored for various physical and chemical applications. In spite of effort by a number of researchers, it is still difficult to grow specific crystal shapes in an environmentally-friendly, simple, and large-scale fabrication pathway. In this study, we report on a facile fabrication of ellipsoidal and double-cone-shaped ZnO mesocrystals elongated along the c-axis by an ionothermal method in choline chloride–urea deep eutectic solvents (CU-DESs) with addition of ethylene glycol (EG). It was found that as high as 16.7 mass% of ZnO could dissolve in CU-DESs at a high temperature by forming zinc cyanate complexes. Addition of EG to the above concentrated ZnO dissolved CU-DESs caused precipitation of ZnO particles which were confirmed as mesocrystals with transmission electron microscope images and selected area electron diffraction patterns. The crystal growth process and shape evolution in the CU-DESs were investigated and discussed. Photoluminescence study with excitation by ultraviolet light showed that the ZnO mesocrystals showed strong ultraviolet emission and relatively weak visible emissions, suggesting their high crystal quality.