Self-Organized ZnO Microcombs with Cuboid Nanobranches by Simple Thermal Evaporation

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• 作者：Chun Li ; Guojia Fang ; Fuhai Su ; Guohua Li ; Xiaoguang Wu ; Xingzhong Zhao
• 刊名：Crystal Growth & Design
• 出版年：2006
• 出版时间：November 2006
• 年：2006
• 卷：6
• 期：11
• 页码：2588 - 2591
• 全文大小：340K
• 年卷期：v.6,no.11(November 2006)
• ISSN：1528-7505

文摘

Microscale wide and millimeters long comblike ZnO single crystals with well-aligned cuboid nanobranches werefabricated using a double-tube simple thermal evaporation method without the presence of a catalyst at 950 C. X-ray diffractionand Raman spectra revealed that the as-grown products had a wurtzite crystal structure. The morphology and microstructure analysesof ZnO microcombs were performed by field emission scanning electron microscopy and transmission electron microscopy. TheZnO microcombs were about 1-3 millimeters in length, with branching rods about 40 m in length and 500-800 nm in width.Selected area electron diffraction confirmed that the branching rods and ribbon stems grew along the [0001] and [010] in eachdirection, respectively. Photoluminescence measurement of the microcombs showed a weak UV emission band and a broad yellow-green emission band centered at 395 and 530 nm, respectively. A possible growth mechanism based on different preferred growthorientations of ribbon stems and branching rods was also proposed.