Liu Jinping, Huang Xintang, Li Yuanyuan, Sulieman K M, He Xiang, Sun Fenglou
Department of Physics, Central China Normal University, Wuhan 430079, P R China.
J Phys Chem B. 2006 Nov 2;110(43):21865-72. doi: 10.1021/jp064487v.
ZnO/Zn-Al layered double hydroxide (ZnO/Zn-Al LDH) hierarchical architecture, a new type of ZnO-based heterostructure, has been synthesized directly on an Al substrate via a facile solution phase process. The firecracker-like heterostructures consist of uniform ZnO nanorods orderly standing at the edges of two-dimensional (2D) surfaces of Zn-Al LDH nanoplatelets. Experimental result obtained from the early growth stage indicates that the underlying Zn-Al LDH nanoplatelet arrays are well constructed with their (00l) planes perpendicular to the surface of Al substrate. We propose that the "edge effect" of Zn-Al LDH and the "lattice match" between ZnO and Zn-Al LDH are vital to the growth of such heterostructures. The effects of total solution volume and NH3.H2O concentration on the formation of heterostructures are investigated. It is found that other LDH-based complex structures can also be achieved controllably by varying the mentioned experimental factors. Our work is the first demonstration of fabricating intricate ZnO/Zn-Al LDH heterostructures as well as well-defined Zn-Al LDH arrays on an Al substrate, for which several promising applications such as optoelectronics, biosensors, and catalysis can be envisioned.
氧化锌/锌铝层状双氢氧化物（ZnO/Zn-Al LDH）分级结构是一种新型的基于氧化锌的异质结构，已通过简便的溶液相法直接在铝基底上合成。这种鞭炮状的异质结构由均匀的氧化锌纳米棒组成，这些纳米棒有序地排列在锌铝层状双氢氧化物纳米片二维（2D）表面的边缘。从早期生长阶段获得的实验结果表明，底层的锌铝层状双氢氧化物纳米片阵列构建良好，其（00l）平面垂直于铝基底表面。我们提出，锌铝层状双氢氧化物的“边缘效应”以及氧化锌与锌铝层状双氢氧化物之间的“晶格匹配”对于这种异质结构的生长至关重要。研究了总溶液体积和氨水浓度对异质结构形成的影响。发现通过改变上述实验因素，还可以可控地实现其他基于层状双氢氧化物的复杂结构。我们的工作首次展示了在铝基底上制备复杂的氧化锌/锌铝层状双氢氧化物异质结构以及定义明确的锌铝层状双氢氧化物阵列，由此可以设想其在光电子学、生物传感器和催化等几个有前景的应用。
