Wu Hui-Xia, Cao Wei-Man, Wang Jun, Yang Hong, Yang Shi-Ping
Nanotechnology. 2008 Aug 27;19(34):345701. doi: 10.1088/0957-4484/19/34/345701. Epub 2008 Jul 16.
Multi-walled carbon nanotubes (MWCNTs) were coated with rare-earth (RE) (Eu(3+), Tb(3+)) 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 Eu(3+) or Tb(3+) 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.
通过一种简单的原位合成方法，利用十二烷基硫酸钠对多壁碳纳米管（MWCNTs）进行非共价功能化，从而在其表面包覆稀土（RE）（Eu(3+)、Tb(3+)）复合层。使用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、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射线光电子能谱（XPS）对所得纳米复合材料进行了广泛表征。还研究了RE-复合物修饰的MWCNTs的光致发光特性。在紫外光激发下，这些样品呈现出Eu(3+)或Tb(3+)离子的特征发射。MWCNT骨架的存在不会淬灭源自RE离子4f壳层内特征电子跃迁的以镧系元素为中心的发光。此外，纳米管骨架的存在可以提高RE复合物在紫外照射下的稳定性，并延长RE复合物的荧光寿命。
