Nanocone Decorated ZnO Microspheres Exposing the (0001) Plane and Enhanced Photocatalytic Properties
Nanocone Decorated ZnO Microspheres Exposing the (0001) Plane and Enhanced Photocatalytic Properties
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DOI：
10.1002/admi.201601238
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发表时间：
2017-07
影响因子：
5.4
通讯作者：
H. Greer;Wuzong Zhou;Guan Zhang;H. Ménard
中科院分区：
文献类型：
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作者：
H. Greer;Wuzong Zhou;Guan Zhang;H. Ménard
使用水-乙二醇（EG）混合物作为溶剂，通过已建立的溶剂热方法制备仅暴露（0001）面的ZnO球形颗粒。结果发现，不良的结晶纳米粒子形成第一，其次是它们的聚集成微球的嵌入在EG和前体分子/离子的微晶组成。在微球中生长的纳米锥和纳米柱都是径向排列的。可能的形成机制，特别是水分子，EG，和ZnO晶体的固有偶极场的作用，进行了讨论。X射线光电子能谱实验表明，球形颗粒仅由锌原子终止。Brunauer-Emmett-Teller测量结合亚甲基蓝染料的降解数据表明，ZnO球的光催化性能取决于生长时间，并且与传统的ZnO纳米棒相比显着改善。这项研究是一个罕见的例子，它结合了ZnO颗粒的纳米结构表征与已知的Zn 2+极性的单一（0001）平面与其光催化性能。
ZnO spherical particles exposing only the (0001) planes are prepared by an established solvothermal method using a water–ethylene glycol (EG) mix as a solvent. It is found that poorly crystalline nanoparticles form first, followed by their aggregation into microspheres consisting of crystallites embedded in EG and precursor molecules/ions. The grown up nanocrystallites and nanocones in the microspheres are all radially aligned. The possible formation mechanisms, in particular, the roles of water molecules, EG, and the intrinsic dipolar field of ZnO crystals, are discussed. X‐ray photoelecton spectroscopy experiments indicate that the spherical particles are terminated solely by zinc atoms. Brunauer–Emmett–Teller measurements in conjunction with the degradation of methylene blue dye data demonstrate that the photocatalytic performance of the ZnO spheres depends on the growth time and is significantly improved compared to traditional ZnO nanorods. This study is a rare example which combines nanostructural characterization of ZnO particles terminated with a single (0001) plane of known Zn2+‐polarity with their photocatalytic performance.