Polypyrrole deposited on the core-shell structured nitrogen-doped porous carbon@Ag-MOF for signal amplification detection of chloride ions

被引:2
作者
Zhai, Xiurong [1 ]
Li, Qian [2 ]
Cao, Yang [3 ]
Han, Mengjie [1 ]
Sun, Hailian [1 ]
Du, Lelin [1 ]
Yang, Xiyun [1 ]
Wei, Yuxin [1 ]
Yu, Congcong [1 ]
机构
[1] Jining Univ, Sch Chem Chem Engn & Mat, Qufu City 273155, Shandong, Peoples R China
[2] Yangzhou Univ, Sch Chem & Chem Engn, Yangzhou 225009, Jiangsu, Peoples R China
[3] Ecol & Environm Affairs Ctr Jining City, Jining City 272000, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
Ag-based metal-organic frameworks; Nitrogen-doped porous carbon; Polypyrrole; Electrochemical detection; Chloride ions; ELECTROCHEMICAL DETECTION; SERUM; NANOPARTICLES; FRAMEWORK; CHANNELS; SENSOR;
D O I
10.1007/s00604-024-06601-z
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An electrochemical platform for signal amplification probing chloride ions (Cl-) is constructed by the composite integrating core-shell structured nitrogen-doped porous carbon@Ag-based metal-organic frameworks (NC@Ag-MOF) with polypyrrole (PPy). It is based on the signal of solid-state AgCl derived from Ag-MOF, since both NC and PPy have good electrical conductivity and promote the electron transport capacity of solid-state AgCl. NC@Ag-MOF was firstly synthesized with NC as the scaffold and then, PPy was anchored on NC@Ag-MOF by chemical polymerization. The composite NC@Ag-MOF-PPy was utilized to modify the electrode, which exhibited a higher peak current and lower peak potential during Ag oxidation compared with those of Ag-MOF and NC@Ag-MOF-modified electrodes. More importantly, in the coexistence of chloride (Cl-) ions in solution, the NC@Ag-MOF-PPy-modified electrode displayed a fairly stable and sharp peak of solid-state AgCl with the peak potentials gradually approaching zero, which might effectively overcome the background interference caused by electroactive substances. The oxidation peak currents of solid-state AgCl increased linearly with the concentration of Cl- ions in a broad range of 0.15 mu M-40 mM and 40-250 mM, with detection limits of 0.10 mu M and 40 mM, respectively. The practical applicability for Cl- ions determination was demonstrated using human serum and urine samples. The results suggest that NC@Ag-MOF-PPy composite could be a promising candidate for the construction of the electrochemical sensor.
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页数:10
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