Hexagonal Crown-Capped Zinc Oxide Micro Rods: Hydrothermal Growth and Formation Mechanism

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• 作者：Lijing Zhang ; Xiaomiao Liu ; Chong Geng ; Huajing Fang ; Zhipeng Lian ; Xiaoqing Wang ; Dezhong Shen ; Qingfeng Yan
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：52
• 期：17
• 页码：10167-10175
• 全文大小：602K
• 年卷期：v.52,no.17(September 3, 2013)
• ISSN：1520-510X

文摘

Hexagonal crown-capped ZnO micro rods were successfully prepared by a facile low-temperature hydrothermal method. The as-prepared ZnO micro rods are 4.4鈥?.2 渭m in length and 2.4鈥?.6 渭m in diameter, possessing a single-crystal hexagonal structure. The morphology evolution and structure changes were tracked during hydrothermal growth by field-emission scanning electron microscopy and X-ray diffraction, respectively. A three-stage growth mechanism of the hexagonal crown-capped ZnO micro rods was proposed and further verified by a growth solution renewal experiment. The room-temperature photoluminescence (PL) spectrum of the hexagonal crowns exhibits a strong UV emission at about 382 nm. The temperature dependent PL results indicate that the UV emission originates from the radiative free-exciton recombination.