Monodispersed ZnSe Colloidal Microspheres: Preparation, Characterization, and Their 2D Arrays

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• 作者：Haizheng Zhong ; Zhixiang Wei ; Mingfu Ye ; Yong Yan ; Yi Zhou ; Yuqin Ding ; Chunhe Yang ; Yongfang Li
• 刊名：Langmuir
• 出版年：2007
• 出版时间：August 14, 2007
• 年：2007
• 卷：23
• 期：17
• 页码：9008 - 9013
• 全文大小：796K
• 年卷期：v.23,no.17(August 14, 2007)
• ISSN：1520-5827

文摘

Uniform and monodispersed ZnSe colloidal microspheres were prepared via a hot injection route by using trioctylamineas solvent and with a relatively higher concentration of the monomer precursors. The size of the colloidal ZnSe sphereswas tuned from 138 to 629 nm by varying the concentration of the precursors, and the size increased linearly withthe concentration of Zinc oleate in the range from 0.05 to 0.10 kg/L with the molar ratio of Zn to Se of 0.5. The colloidalmicrospheres were well characterized by SEM, TEM, HRTEM, EDS, UV-vis, and PL techniques. Detailed examinationconfirmed that the colloidal microspheres were formed by the in-situ aggregation of ZnSe nanoparticles. Furthermore,the 2D ordered assembly of the ZnSe microspheres was realized via a simple vertical precipitation technique. Dueto the high refractive index and absence of absorption in the visible region, the monodispersed ZnSe colloidal microspherescould be potential building blocks to construct photonic band gap crystals and other functional devices.