Luminescence and photocatalytic activity of ZnO nanocrystals: correlation between structure and property.
Luminescence and photocatalytic activity of ZnO nanocrystals: correlation between structure and property.
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DOI：
10.1021/ic062394m
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发表时间：
2007-07
影响因子：
4.6
通讯作者：
Yuanhui Zheng;Chongqi Chen;Y. Zhan;Xingyi Lin;Q. Zheng;K. Wei;Jiefang Zhu;Yingjie Zhu
中科院分区：
文献类型：
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作者：
Yuanhui Zheng;Chongqi Chen;Y. Zhan;Xingyi Lin;Q. Zheng;K. Wei;Jiefang Zhu;Yingjie Zhu
具有受控尺寸、纵横比和氧缺陷（例如，类型和浓度）通过简单的溶剂热和热处理方法成功地制备。采用XRD、N2物理吸附、TEM、IR和XPS等手段对样品的结构进行了表征。结果表明，随着[OH-]/[Zn 2 +]的增加，ZnO纳米晶的长径比和尺寸增大，随着退火温度的升高，形貌由纳米棒向纳米颗粒转变，相应样品的BET比表面积减小;在实验中相应地形成了不同的氧缺陷，它们可能是氧空位（Vo**）和间隙氧（Oi“）。随着结构的演变，ZnO纳米晶的红外吸收带和可见光致发光发射峰发生了位移和分裂，这是由于氧缺陷的变化。此外，研究发现所合成的ZnO纳米晶的光催化活性主要取决于氧缺陷的类型和浓度。详细讨论了其结构与性能的关系及可能的光催化机理。
Low-dimensional ZnO nanocrystals with controlled size, aspect ratio, and oxygen defects (e.g., type and concentration) are successfully prepared through simple solvothermal and thermal treatment methods. The structure of the as-synthesized samples is characterized by XRD, N2 physical adsorption, TEM, and IR and XPS spectra. The results show that the aspect ratio and size of the as-synthesized ZnO nanocrystals increase with increasing [OH-]/[Zn2+]; the morphology evolves from nanorod to nanoparticle with an increase in the annealing temperature; the BET surface areas of the corresponding samples decrease during these processes, respectively; and different oxygen defects, which are likely to be oxygen vacancy (Vo**) and interstitial oxygen (Oi''), are formed in our experiments accordingly. With evolution of the structure, IR absorption bands and visible photoluminescence emission peaks of the synthesized ZnO nanocrystals shift and split, which is ascribed to the change of oxygen defects. In addition, it is found that the photocatalytic activity of the synthesized ZnO nanocrystals is mainly dependent on the type and concentration of oxygen defects. The relationship of structure-property and the possible photocatalytic mechanism are discussed in detail.