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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Disposable Amperometric Sensor Based on High-Performance PEDOT:PSS/Ionic Liquid Nanocomposite Thin Film-Modified Screen-Printed Electrode for the Analysis of Catechol in Natural Water Samples
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A Disposable Amperometric Sensor Based on High-Performance PEDOT:PSS/Ionic Liquid Nanocomposite Thin Film-Modified Screen-Printed Electrode for the Analysis of Catechol in Natural Water Samples

机译：基于高性能PEDOT：PSS /离子液体纳米复合薄膜修饰丝网印刷电极的一次性安培传感器用于分析自然水中的邻苯二酚

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A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements. The prepared PEDOT:PSS/IL composite thin-film exhibited a nano-porous microstructure and was found to be highly stable and conductive with enhanced electrocatalytic properties towards catechol, a priority pollutant. The linear working range for catechol was found to be 0.1 µM–330.0 µM with a sensitivity of 18.2 mA·mM·cm−2 and a calculated limit of detection (based on 3× the baseline noise) of 23.7 µM. When the PEDOT:PSS/IL/SPCE sensor was used in conjunction with amperometry in stirred solution for the analysis of natural water samples, the precision values obtained on spiked samples (20.0 µM catechol added) (n = 3) were 0.18% and 0.32%, respectively, with recovery values that were well over 99.0%.
机译：聚（3,4-乙撑二氧噻吩）（PEDOT）的导电聚合物基复合材料：掺有不同百分比的室温离子液体（IL），1-乙基-3-甲基咪唑鎓盐的聚（4-苯乙烯磺酸盐）（PSS）制备了四氟硼酸盐（[EMIM] [BF4]），并将非常少量的复合材料（2.0 µL）滴涂在丝网印刷碳电极（SPCE）的工作区域上。用PEDOT：PSS / IL复合薄膜改性的SPCE通过循环伏安法（CV），电化学阻抗谱（EIS），扫描电子显微镜（SEM），轮廓测定法和固着接触角测量来表征。制备的PEDOT：PSS / IL复合薄膜具有纳米孔微结构，被发现具有很高的稳定性和导电性，并且对优先污染的邻苯二酚具有增强的电催化性能。儿茶酚的线性工作范围为0.1 µM–330.0 µM，灵敏度为18.2 mA·mM·cm −2 ，计算出的检出限（基于基线噪声的3倍）为23.7 µM。当在搅拌溶液中将PEDOT：PSS / IL / SPCE传感器与安培法结合使用以分析天然水样品时，加标样品（添加20.0 µM邻苯二酚）（n = 3）获得的精密度值为0.18％和0.32 ％的回收率，分别远高于99.0％。

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