Morphology-controlled synthesis of ZnO 3D hierarchical structures and their photocatalytic performance
Morphology-controlled synthesis of ZnO 3D hierarchical structures and their photocatalytic performance
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DOI：
10.1039/c2ce26157j
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发表时间：
2012-11
期刊：
影响因子：
3.1
通讯作者：
Hongyu Sun;Yanlong Yu;Yanlong Yu;Jun Luo;Mashkoor Ahmad;Jing Zhu
中科院分区：
文献类型：
--
作者：
Hongyu Sun;Yanlong Yu;Yanlong Yu;Jun Luo;Mashkoor Ahmad;Jing Zhu
在不添加有机试剂的情况下，在室温下成功合成了由不同低维结构单元（纳米片、纳米针）组装而成的ZnO三维分级结构。通过简单地改变反应物的浓度，可以很好地控制分级结构的形态。在实验结果的基础上，提出了ZnO三维分级结构形成的可能机制。ZnO三维分级结构的室温光致发光谱表明，从纳米片到细针花，紫外发射的相对强度逐渐增加，并且可以通过控制形貌进行调节。重要的是，细针花样品表现出增强的光催化性能相比，由于其他ZnO纳米结构的结构特征和良好的光学质量。
ZnO 3D hierarchical structures assembled by different low-dimensional building blocks (nanosheet, nanoneedle) have been successfully synthesized at room temperature without the addition of organic agents. The morphology of the hierarchical structures can be well controlled by simply changing the concentration of the reactant. On the basis of the experimental results, a possible mechanism for the formation of the ZnO 3D hierarchical structures is proposed. The room temperature photoluminescence spectra of the ZnO 3D hierarchical structures show that the relative intensity of UV emission increases from nanosheets to the thin needle flowers and can be tuned by controlling the morphology. Importantly, the thin needle flowers sample exhibits an enhanced photocatalytic performance as compared with the other ZnO nanostructures due to structural features and good optical quality.