Growth of Dumbbell-like ZnO Microcrystals under Mild Conditions and their Photoluminescence Properties
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- 作者：Qingjiang Yu ; Cuiling Yu ; Haibin Yang ; Wuyou Fu ; Lianxia Chang ; Jing Xu ; Ronghui Wei ; Hongdong Li ; Hongyang Zhu ; Minghui Li ; Guangtian Zou ; Guorui Wang ; Changlu Shao ; Yichun Liu
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：July 23, 2007
- 年：2007
- 卷：46
- 期：15
- 页码：6204 - 6210
- 全文大小：373K
- 年卷期：v.46,no.15(July 23, 2007)
- ISSN：1520-510X
文摘
Large-scale uniform dumbbell-like ZnO microcrystals were successfully synthesized via a facile solution methodunder mild conditions. The as-prepared dumbbells, with lengths of 3.5-5.4 
m and diameters of 1.3-1.8 m,possess a single-crystal hexagonal structure and grow along the [0001] direction. The influence of the reactantconcentration on the size and shapes of the ZnO samples had been studied, and the results revealed that thereactant concentration plays a crucial role in determining final morphologies of the samples. Moreover, the evolutionprocess of the dumbbell-like ZnO microcrystals was viewed by field-emission scanning electron microscopy (FE-SEM) characterization, and a possible formation mechanism was proposed. In addition, optical properties of theZnO samples prepared at different reaction times were also investigated by photoluminescence (PL) spectroscopy.The room-temperature PL spectrum of the dumbbell-like ZnO microcrystals shows a strong UV emission peak. TheUV emission is further identified to originate from the radiative free-exciton recombination by the temperature-dependent PL.
m and diameters of 1.3-1.8 m,possess a single-crystal hexagonal structure and grow along the [0001] direction. The influence of the reactantconcentration on the size and shapes of the ZnO samples had been studied, and the results revealed that thereactant concentration plays a crucial role in determining final morphologies of the samples. Moreover, the evolutionprocess of the dumbbell-like ZnO microcrystals was viewed by field-emission scanning electron microscopy (FE-SEM) characterization, and a possible formation mechanism was proposed. In addition, optical properties of theZnO samples prepared at different reaction times were also investigated by photoluminescence (PL) spectroscopy.The room-temperature PL spectrum of the dumbbell-like ZnO microcrystals shows a strong UV emission peak. TheUV emission is further identified to originate from the radiative free-exciton recombination by the temperature-dependent PL.