Time-dependent control of phase and morphology transformation of porous ZnO hollow microspheres by a facile one-step solution route
Time-dependent control of phase and morphology transformation of porous ZnO hollow microspheres by a facile one-step solution route
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通过简便的一步解决方案对多孔 ZnO 空心微球的相和形貌转变进行时间依赖性控制
作者：
张秋禹
以柠檬酸三钠为形状导向剂，通过简单的一步溶液法制备了ZnO晶相为PDF#21 -1486的多孔ZnO空心微球。采用场发射扫描电镜（FESEM）、傅立叶变换红外光谱（FT-IR）、透射电镜（TEM）和X射线衍射（XRD）对样品进行了表征。实验结果表明，反应时间对产物的物相和形貌变化有显著影响。在控制生长时间的时刻，获得了平均直径为2-3 μm、孔洞直径为0.5 μm的多孔ZnO空心微球，具有高比表面积（117.36 m2 g-1）和大孔容（0.50 cm 3 g-1）。在实验基础上，提出了多孔ZnO空心微球的生长机制为柠檬酸锌络合物优先生成，柠檬酸锌络合物溶解与ZnO晶体形成同时发生的两步过程，这与柠檬酸根离子在定向生长中的特殊作用有关。
Porous ZnO hollow microspheres with a ZnO crystalline phase of PDF # 21-1486 have been prepared by a simple one-step solution route using the trisodium citrate as a shape-directing agent. FESEM, FT-IR, TEM and XRD were used to characterize the samples. Series of experiments showed the reaction time has a prominent impact on the phase and morphology transformation. At a point of the controlling growth time, porous ZnO hollow microspheres with average diameter of 2–3 μm and hole-opening diameter of ∼0.5 μm were obtained which exhibited a high surface area (117.36 m2 g−1) and a large pore volume (0.50 cm3 g−1). On the basis of experiment results, a possible growth mechanism of as-synthesized porous ZnO hollow microspheres was concluded to be a two-step process: the zinc citrate complexion was preferentially formed, and then the dissolution of zinc citrate complexion and the formation of ZnO crystal occurred simultaneously, which associated with the special role of the citrate anion on oriented growth.
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