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Coating multi-walled carbon nanotubes with rare-earth complexes by an in situ synthetic method

机译:通过原位合成方法用稀土配合物涂覆多壁碳纳米管

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Multi-walled carbon nanotubes (MWCNTs) were coated with rare-earth (RE) (Eu3+, Tb3+) complex layers by a simple in situ synthetic method via noncovalently functionalized MWCNTs with sodium dodecyl sulfate. Extensive characterizations of the resulting nanocomposite materials have been performed using scanning electron microscopy (SEM), FT-IR spectra, x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive x-ray spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS). The photoluminescence properties of the RE-complex-modified MWCNTs were also investigated. Under the excitation of UV light, these samples exhibit characteristic emissions of Eu3+ or Tb3+ ions. The presence of the MWCNT framework does not quench the lanthanide-centered luminescence originating from the characteristic electronic transitions within the 4f shell of the RE ions. Furthermore, the existence of the nanotube framework can improve the stability of the RE complex under UV irradiation and elongate the fluorescence lifetime of the RE complex.
机译:通过一种简单的原位合成方法,通过十二烷基硫酸钠与非共价官能化的MWCNT,用稀土(RE)(Eu3 +,Tb3 +)复合层涂覆多壁碳纳米管(MWCNT)。所得纳米复合材料的广泛表征已使用扫描电子显微镜(SEM),FT-IR光谱,x射线衍射(XRD),透射电子显微镜(TEM),高分辨率透射电子显微镜(HRTEM),能量色散X射线光谱(EDS)和X射线光电子光谱(XPS)。还研究了稀土复合物改性的碳纳米管的光致发光性能。在紫外线的激发下,这些样品表现出Eu3 +或Tb3 +离子的特征发射。 MWCNT骨架的存在不会淬灭源自RE离子4f壳层中特征性电子跃迁的镧系元素为中心的发光。此外,纳米管骨架的存在可以改善RE络合物在紫外线照射下的稳定性,并延长RE络合物的荧光寿命。

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