Ratiometric fluorometric determination of silver(I) by using blue-emitting silicon- and nitrogen-doped carbon quantum dots and red-emitting N-acetyl-L-cysteine-capped CdTe quantum dots
Ratiometric fluorometric determination of silver(I) by using blue-emitting silicon- and nitrogen-doped carbon quantum dots and red-emitting N-acetyl-L-cysteine-capped CdTe quantum dots
复制标题
使用蓝色发射硅和氮掺杂碳量子点和红色发射 N-乙酰基-L-半胱氨酸封端的 CdTe 量子点比率荧光法测定银 (I)
DOI：
10.1007/s00604-019-3818-6
复制
发表时间：
2019-11-01
影响因子：
5.7
通讯作者：
Tong, Changlun
中科院分区：
文献类型：
--
作者：
Wu, Huifang;Tong, Changlun
本文介绍了一种测定银(I)的比率荧光法。该方法利用一种双发射量子点杂化技术，它由(A)蓝光掺杂的硅和氮掺杂的碳量子点(CQD)和(B)以N-乙酰-L-半胱氨酸为封端的红色发射的镉镉量子点(QD)组成。红光发射的CdTe量子点被Ag(I)强烈而特异地猝灭，而蓝光发射的N，Si-CQD不被猝灭。将这两种量子点混合在一起，用作比率荧光探针。在5.0-1000 nm范围内，强度对数[(I608/I441)0/(I608/I441)]与Ag(I)浓度呈线性关系，检出限(S/N=3)为1.7 nm。可能的干扰物质(包括17种常见金属离子、12种阴离子和黄腐酸)不干扰测定。该方法用于地表水和废水样品中银(I)的测定。并对比值分析体系的荧光猝灭机理进行了详细讨论。由硅和氮掺杂的碳量子点(N，Si-CQD)和N-乙酰-L半胱氨酸(CdTe)封端的Cd Te量子点组成的比率探针的图形摘要示意图。这种双发射量子点杂化材料用于水样中银(I)的超灵敏和高选择性检测。
A ratiometric fluorometric assay for silver(I) is described. The method makes use of a dually emitting quantum dot hybrid, which is composed of (a) blue-fluorescent silicon- and nitrogen-doped carbon quantum dots (CQDs), and (b) of red-emitting CdTe quantum dots (QDs) capped with N-acetyl-L-cysteine. The red-emitting CdTe QDs undergo strong and specific quenching by Ag(I), whereas the blue-emitting N,Si-CQDs are not quenched. The two kinds of QDs are mixed and used as a ratiometric fluorescent probe. A linear relationship is found between the log of intensities [(I608/I441)0/(I608/I441)] and the concentration of Ag(I) in the range from 5.0-1000 nM, and the limit of detection (at S/N = 3) is 1.7 nM. Possible interferents (including 17 general metal ions, 12 anions and fulvic acid) do not interfere with the determination. The assay was successfully used for the determination of Ag(I) in surface water and wastewater samples. The fluorescence quenching mechanism of the ratiometric assay system was also discussed in detailed. Graphical abstract Schematic representation of a ratiometric probe composed of silicon- and nitrogen-doped carbon quantum dots (N,Si-CQDs) and CdTe quantum dots capped by N-acetyl-L-cysteine (CdTe QDs). This dual-emission QDs hybrid was fabricated for ultrasensitive and highly selective detection of silver(I) in water samples.