Faridbod Farnoush, Jamali Abbas, Ganjali Mohammad Reza, Hosseini Morteza, Norouzi Parviz
Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran,
J Fluoresc. 2015 May;25(3):613-9. doi: 10.1007/s10895-015-1544-y. Epub 2015 Mar 26.
In this work, a ligand capped CdS QDs was synthesized, characterized and its fluorescence behavior was studied. The surface of the CdS QDs was modified using N-(3-methyl-2-(thiophene-2-carboxamido) phenyl) thiophene-2-carboxamide. The immobilized ligand on the surface of the CdS QDs can interact by cationic species due to the existence of donating atoms in its structures. Thus, effect of some metal cations on the fluorescent intensity of the ligand capped CdS QDs were studied. It was found that fluorescence intensity of the modified CdS QDs quenched selectively by addition of Co(II) ion in comparison with other cations tested. The ligand capped CdS QDs can be used as a fluorescent bulk chemosensor for detection of Co(II) ions. The fluorescent quenching is linear in the range of 1.0 × 10(-5) to 1.5 × 10(-4) mol L(-1) of Co(II) ions. The limit of detection was obtained 8.3 × 10(-7) mol L(-1). The nanosensor exhibits high selectivity toward Co(II) ions in comparison with common metal ions.
在这项工作中，合成并表征了一种配体包覆的硫化镉量子点，并研究了其荧光行为。使用N-(3-甲基-2-(噻吩-2-甲酰胺基)苯基)噻吩-2-甲酰胺对硫化镉量子点的表面进行了修饰。由于其结构中存在供体原子，硫化镉量子点表面固定的配体可以与阳离子物种相互作用。因此，研究了一些金属阳离子对配体包覆的硫化镉量子点荧光强度的影响。结果发现，与其他测试阳离子相比，添加Co(II)离子会选择性地猝灭修饰后硫化镉量子点的荧光强度。配体包覆的硫化镉量子点可用作检测Co(II)离子的荧光整体化学传感器。荧光猝灭在1.0×10(-5)至1.5×10(-4) mol L(-1)的Co(II)离子浓度范围内呈线性关系。检测限为8.3×10(-7) mol L(-1)。与常见金属离子相比，该纳米传感器对Co(II)离子具有高选择性。
