Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg2+ in water and living cells
Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg2+ in water and living cells
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DOI：
10.1039/c4an01386g
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发表时间：
2015-01-01
期刊：
影响因子：
4.2
通讯作者：
Bhutia, Sujit K.
中科院分区：
文献类型：
--
作者：
Mohapatra, Sasmita;Sahu, Swagatika;Bhutia, Sujit K.
设计了一种基于氮硫共掺杂碳点（NSCD）的高选择性光致发光汞探针。用单个聚合物分子前驱体制备的nscd的PL量子产率为69%。汞加入后的开关荧光变化归因于非辐射电子从激发态转移到金属离子的d轨道。与其他金属离子相比，NSCD的硫部分与Hg2+之间的软-软酸碱相互作用使荧光探针对Hg2+具有更高的特异性和选择性。汞离子的检出限为0.05 nM。由于其高光稳定性、低毒性和低检测限，这些碳点被证明是检测活细胞中Hg2+的优良探针。
A nitrogen and sulphur co-doped carbon dot (NSCD) based highly selective photoluminescent probe for mercury detection has been designed. The NSCDs with a PL quantum yield of 69% are easily prepared from a single polymeric molecular precursor. The turn on-off fluorescence change upon mercury addition is attributed to the nonradiative electron transfer from the excited state to the d-orbital of the metal ion. The soft-soft acid-base interaction between the sulphur part of the NSCD and Hg2+ makes the fluorescence probe more specific and selective towards Hg2+ in contrast to other metal ions. The limit of detection of mercury ions is found to be 0.05 nM. Due to their high photostability, low toxicity and low detection limit, these carbon dots are demonstrated to be excellent probes for the detection of Hg2+ in the living cell.