乙二胺四乙酸
纳米传感器
检出限
荧光
锌
化学
钝化
碳纤维
核化学
无机化学
分析化学(期刊)
材料科学
螯合作用
纳米技术
色谱法
有机化学
物理
复合材料
复合数
量子力学
图层(电子)
作者
Bai Yang,Qiuling Tang,Meng Yang,Junjun Liu,Tanglue Feng,Xiaohuan Zhao,Shoujun Zhu,Weixian Yu,Bai Yang
出处
期刊:Langmuir
[American Chemical Society]
日期:2018-06-11
卷期号:34 (26): 7767-7775
被引量:68
标识
DOI:10.1021/acs.langmuir.8b00947
摘要
Zn2+-passivated carbon dots (named Z-CDs) were synthesized from zinc gluconate for the first time through a one-step pyrolysis treatment. The mechanism of Zn2+-enhanced fluorescence was carefully investigated, and a new strategy to passivate the surfaces of CDs by Zn2+ was proposed. Inspired by the complexation reaction between Zn2+ and ethylenediaminetetraacetic acid (EDTA), a reversible "off-on" fluorescent nanosensor for the detection of EDTA and Zn2+ was constructed based on the depassivation and repassivation of Z-CDs, with a limit of detection as low as 3.2 × 10-7 M and 5.1 × 10-7 M, respectively. The proposed Z-CD-based nanosensor had been further utilized for EDTA and Zn2+ monitoring in tap water with excellent recovery. To the best of our knowledge, this was the first report of a fluorescence-based sensor of EDTA and a turn-on sensor of Zn2+ based on CDs with reversible detection capability. Also, benefiting from the low toxicity of zinc, Z-CDs were applied for multicolor bioimaging and in vitro detection in cells.
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