Fabrication and Optical Properties of Large-Scale ZnO Nanotube Bundles via a Simple Solution Route

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• 作者：Qingjiang Yu ; Wuyou Fu ; Cuiling Yu ; Haibin Yang ; Ronghui Wei ; Minghui Li ; Shikai Liu ; Yongming Sui ; Zhanlian Liu ; Mingxia Yuan ; Guangtian Zou ; Guorui Wang ; Changlu Shao ; Yichun Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：November 29, 2007
• 年：2007
• 卷：111
• 期：47
• 页码：17521 - 17526
• 全文大小：521K
• 年卷期：v.111,no.47(November 29, 2007)
• ISSN：1932-7455

文摘

Large-scale ZnO nanotube bundles were successfully synthesized by a single solution method at lowertemperature. Every ZnO nanotube bundle is composed of closely packed nanotubes, with inner diameters of~350 nm and wall thicknesses of ~60 nm, and forms radiating structures. The influence of the reaction timeon the size and shapes of the ZnO samples was studied in detail, and the results revealed that the reactiontime plays an important role in determining final morphologies of the samples. The formation of the tubularstructure may be due to the selective dissolution of the metastable Zn-rich (0001) polar surfaces, and a possiblegrowth model was proposed. Optical properties of the ZnO nanotube bundles were also investigated byphotoluminescence (PL) spectroscopy. It was found that the UV emission peak of the nanotube bundles didnot change its position, while the visible emission band showed an obvious red shift when the nanotubebundles were annealed in ambient oxygen. Moreover, the UV emission was further identified to originatefrom the radiative free exciton recombination by the temperature-dependent PL.