A versatile ratiometric electrochemical sensing platform based on N-Mo2C for detection of m-nitrophenol

再现性 检出限 重复性 电化学 电化学气体传感器 硝基苯酚 自来水 电极 选择性 化学 分析化学(期刊) 材料科学 线性范围 纳米技术 色谱法 环境科学 环境工程 生物化学 物理化学 催化作用
作者
Hailong Ren,Jingjing Wang,Huanhuan Feng,Yingchun Li,Bang‐Ce Ye
出处
期刊:Biosensors and Bioelectronics [Elsevier BV]
卷期号:144: 111663-111663 被引量:30
标识
DOI:10.1016/j.bios.2019.111663
摘要

M-nitrophenol (m-NP) is a high priority environmental pollutant and poses a series of threats on human health. Accurate and rapid detection of m-NP in practical samples is very important as this is the key prerequisite for its effective monitoring. Eelectrochemical sensor, though long serving as highly sensitive and fast analytical tool, suffers from the bottleneck problems like low specificity, poor reproducibility, susceptibility to internal and external disturbances, etc. Herein, we developed a ratiometric electrochemical sensor (R-ECS) for m-NP detection, in which nitrogen-doped Mo2C (N-Mo2C) was deployed as the sensing agent and methylene blue (MB) as the internal reference. Full characterization of N-Mo2C was carried out in the aspects of morphology, composition, chemical bonds and electrochemical behavior, and the sensing performance of the easy-to-operate R-ECS was evaluated. Complete separation of the oxidation peaks of m-NP and MB was achieved using the MB/N-Mo2C composite modified electrode and their ratiometric signals were adopted for quantification of m-NP. The linear relation between the electrical signal and the concentration of m-NP is in the range of 1–1500 μM, with the detection limit of 0.256 μM (S/N = 3). The sensor was applied to measure m-NP in real samples from tap water and river. Experimental results demonstrate that it exhibits decent repeatability, reproducibility, stability and selectivity, which proves its great practical potential as an analytical detector.
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