Fluorescence detection of mercury ions and cysteine based on magnesium and nitrogen co-doped carbon quantum dots and IMPLICATION logic gate operation
Fluorescence detection of mercury ions and cysteine based on magnesium and nitrogen co-doped carbon quantum dots and IMPLICATION logic gate operation
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基于镁氮共掺杂碳量子点的汞离子和半胱氨酸荧光检测及蕴含逻辑门操作
DOI：
10.1016/j.snb.2016.02.141
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发表时间：
2016-08-01
影响因子：
8.4
通讯作者：
Li, Nian Bing
中科院分区：
文献类型：
--
作者：
Liu, Ting;Li, Na;Li, Nian Bing
开发了新型镁氮共掺杂碳量子点（Mg-N-CQDs）荧光开关，用于汞（II）和半胱氨酸（Cys）的灵敏和选择性传感。水热法合成的Mg-N-CQDs具有较高的荧光强度。但加入Hg（II）后，Mg-N-CQDs水溶液的荧光被猝灭，这可能是由于Mg-N-CQDs与Hg（II）形成了无荧光的配合物。有趣的是，含Hg（II）的Mg-N-CQDs水溶液的荧光可以在Cys存在下逐渐恢复，这是由于Hg（II）对Cys的结合亲和力强于Mg-N-CQDs。基于这些现象，探索了一种检测Hg（II）和Cys的荧光探针，并将其应用于真实的水样中Hg（II）的检测，获得了满意的结果。此外，使用Hg（II）/Cys作为输入和Mg-N-CQD的荧光信号作为输出，构建了一个IMPLICATION逻辑门。(C)2016爱思唯尔B. V.保留所有权利。
Novel magnesium and nitrogen co-doped carbon quantum dots (Mg-N-CQDs) were developed as a fluorescent switch for sensitive and selective sensing of Hg(II) and cysteine (Cys). The Mg-N-CQDs synthesized by hydrothermal method possess high fluorescence intensity. However, after the addition of Hg(II), the fluorescence of Mg-N-CQDs aqueous solution was dramatically quenched, which may be attributed to the formation of non-fluorescent complex between Mg-N-CQDs and Hg(II). Interestingly, the fluorescence of the Mg-N-CQDs aqueous solution containing Hg(II) could be recovered gradually in the presence of Cys, due to the stronger binding affinity of Hg(II) toward Cys than toward Mg-N-CQDs. Based on these phenomena, a fluorescent probe for detection of Hg(II) and Cys was explored, and further applied to detect Hg(II) in real water samples with satisfactory results. Moreover, an IMPLICATION logic gate was constructed using Hg(II)/Cys as inputs and the fluorescence signal of Mg-N-CQDs as an output. (C) 2016 Elsevier B.V. All rights reserved.