Department of Chemistry, College of Science, University of Sulaimani, Sulaimani, Kurdistan, Iraq.
Komar University of Science and Technology, Qliasan St, Sulaimani, Kurdistan, Iraq.
Anal Bioanal Chem. 2018 Sep;410(24):6331-6336. doi: 10.1007/s00216-018-1242-0. Epub 2018 Jul 13.
Carbon quantum dots are becoming powerful fluorophore materials for metal ion analysis. Here, highly passivated green phosphorous and nitrogen co-doped carbon quantum dots (C-dots) were prepared using low-temperature carbonization route. Strong green fluorescence emission around 490 nm and excitation wavelength independent C-dots were obtained. Morphological, surface, and optical properties of the C-dots were characterized. Fluorescence emission of C-dots was quenched selectively by copper ions and restored by adding copper chelators, such as EDTA and sulfide ions. Thus, C-dots were successfully used for direct determination of copper ions. Detection limit as low as 1.5 nM (s/n = 3) was achieved for copper ions. Such a low detection limit is very significant for metal analysis using our proposed facile method and low-cost substrates. Experimental results showed that the prepared C-dots demonstrated high sensitivity and selectivity for Cu ion detection and the method is robust and rugged. Graphical abstract ᅟ.
碳量子点在金属离子分析中正在成为一种强大的荧光团材料。在这里，使用低温碳化路线制备了高度钝化的绿色磷和氮共掺杂碳量子点（C 点）。得到了约 490nm 的强绿色荧光发射和激发波长无关的 C 点。对 C 点的形态、表面和光学性质进行了表征。C 点的荧光发射被铜离子选择性猝灭，并通过添加铜螯合剂（如 EDTA 和硫离子）得以恢复。因此，C 点成功地用于直接测定铜离子。铜离子的检测限低至 1.5nM（s/n=3）。对于使用我们提出的简单方法和低成本衬底进行的金属分析，这种低检测限非常重要。实验结果表明，所制备的 C 点对 Cu 离子检测具有高灵敏度和选择性，并且该方法稳健且坚固。
