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Facile Controlled Synthesis and Spectroscopy of CdS_(1-x)Se_x Alloy and (CdS)_(1-x)@(CdSe)_x Core-Shell Nanotetrapods

机译:CdS_(1-x)Se_x合金和(CdS)_(1-x)@(CdSe)_x核壳纳米四脚架的简便控制合成和光谱

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摘要

Nanotetrapods of alloy CdS_(1-x)Se_x and core-shell (CdS)_(1-x)@(CdSe)_x are fabricated easily in water using ethylenediamine as a solvent-coordinating molecular template, and then their optical properties are investigated using diverse static and time-resolved spectroscopic methods. The arms of the alloy nanotetrapods have single-crystalline structures of CdS_(1-x)Se_x without showing staking faults, while the arms of the core-shell nanotetrapods display polycrystalline shell structures of CdSe. The optical properties of CdS_(1-x)Se_x, where Se atoms are isolated in the CdS lattice, are very different from those of (CdS)_(1-x)@(CdSe)_x, where banded CdSe passivates the CdS core. Compared with pure CdS nanotetrapods, the photoluminescence of CdS_(0.9)Se_(0.1) shifts to the red by 40 nm, whereas that of (CdS)_(0.9)@(CdSe)_(0.1) does so only by 5 nm. Although the mean luminescence lifetime of alloy CdS_(1-x)Se_x is shorter than that of pure CdS, it is still much longer than that of core-shell (CdS)_(1-x)@(CdSe)_x.
机译:以乙二胺为配位分子模板,易于在水中制备CdS_(1-x)Se_x合金和核壳(CdS)_(1-x)@(CdSe)_x的纳米四足动物,然后研究其光学性质使用多种静态和时间分辨光谱方法。合金纳米四脚架的臂具有CdS_(1-x)Se_x的单晶结构,没有出现铆钉缺陷,而核壳型纳米四脚架的臂显示了CdSe的多晶壳结构。 CdS_(1-x)Se_x的光学性质(其中Se原子在CdS晶格中隔离)与(CdS)_(1-x)@(CdSe)_x的光学性质(带状CdSe钝化CdS核)的光学性质非常不同。与纯CdS纳米四脚架相比,CdS_(0.9)Se_(0.1)的光致发光向红色偏移40 nm,而(CdS)_(0.9)@(CdSe)_(0.1)的光致发光仅向红色偏移5 nm。尽管CdS_(1-x)Se_x合金的平均发光寿命比纯CdS短,但仍比核壳(CdS)_(1-x)@(CdSe)_x的平均发光寿命长得多。

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  • 来源
    《Advanced Functional Materials》 |2009年第24期|3910-3916|共7页
  • 作者单位

    School of Chemistry Seoul National University NS60, Seoul 151-742 (Korea);

    School of Chemistry Seoul National University NS60, Seoul 151-742 (Korea);

    School of Chemistry Seoul National University NS60, Seoul 151-742 (Korea);

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