Differential pulse voltammetric determination of the carcinogenic diamine 4,4′-oxydianiline by electrochemical preconcentration on a MoS2 based sensor,Microchimica Acta

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Differential pulse voltammetric determination of the carcinogenic diamine 4,4′-oxydianiline by electrochemical preconcentration on a MoS2 based sensor
Microchimica Acta ( IF 5.3 ) Pub Date : 2019-11-16 , DOI: 10.1007/s00604-019-3906-7
María Del Pozo ₁ , Carlos Sánchez-Sánchez ₂ , Luis Vázquez ₂ , Elías Blanco ₁ , María Dolores Petit-Domínguez ₁ , José Ángel Martín-Gago ₂ , Elena Casero ₁ , Carmen Quintana ₁

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An electrochemical sensor for the carcinogen 4,4′-oxydianiline (Oxy) is described. The method is based on the ability of MoS2 nanosheets to preconcentrate Oxy. A glassy carbon electrode (GCE) was covered, by drop-casting, with MoS2 nanosheets that were obtained by exfoliation. X-Ray photoemission spectroscopy indicates that Oxy accumulates on the MoS2 nanosheets through an electropolymerization process similar to that reported for aniline. Both electrochemical impedance spectroscopy and atomic force microscopy were used to characterize the electrode surface at the different stages of device fabrication. Employing the current measured at +0.27 V vs. Ag/AgCl after Oxy adsorption, the modified GCE enables the voltammetric detection of Oxy at 80 nM levels with relative errors and relative standard deviations of <8.3 and <5.6%, respectively, at all the concentrations studied. The method was applied to the selective determination of Oxy in spiked river water samples. Very good selectivity and recoveries of around 95% in average are found. Graphical abstract Schematic representation of 4,4-oxydianiline electrochemical polymerization and preconcentration onto molybdenum disulfide nanosheets for the diamine determination in river waters. Schematic representation of 4,4-oxydianiline electrochemical polymerization and preconcentration onto molybdenum disulfide nanosheets for the diamine determination in river waters.

中文翻译：

在基于 MoS2 的传感器上通过电化学预浓缩法测定致癌二胺 4,4'-二苯胺的差分脉冲伏安法

描述了一种用于致癌物质 4,4'-二苯胺 (Oxy) 的电化学传感器。该方法基于 MoS2 纳米片预浓缩氧的能力。玻璃碳电极 (GCE) 通过滴注法覆盖有通过剥离获得的 MoS2 纳米片。X 射线光电子能谱表明氧通过类似于苯胺报道的电聚合过程积聚在 MoS2 纳米片上。电化学阻抗谱和原子力显微镜均用于表征器件制造不同阶段的电极表面。采用在氧吸附后在 +0.27 V 与 Ag/AgCl 下测量的电流，改进的 GCE 能够以伏安法检测 80 nM 水平的氧，相对误差和相对标准偏差分别为 <8.3 和 <5.6%，在所有研究的浓度。该方法应用于加标河水中氧的选择性测定。发现非常好的选择性和平均约 95% 的回收率。图形摘要 4,4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺测定的示意图。4,4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺测定的示意图。4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺的测定。4,4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺测定的示意图。4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺的测定。4,4-氧化二苯胺电化学聚合和预浓缩到二硫化钼纳米片上用于河水中二胺测定的示意图。

更新日期：2019-11-16

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