Krampa Francis D, Aniweh Yaw, Awandare Gordon A, Kanyong Prosper
West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra, Ghana.
Department of Biochemistry, Cell & Molecular Biology, University of Ghana, Legon, Accra, Ghana.
Sensors (Basel). 2017 Jul 26;17(8):1716. doi: 10.3390/s17081716.
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 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) ( = 3) were 0.18% and 0.32%, respectively, with recovery values that were well over 99.0%.
制备了一种基于导电聚合物的复合材料，该材料由聚（3,4-乙撑二氧噻吩）（PEDOT）：聚（4-苯乙烯磺酸盐）（PSS）掺杂不同百分比的室温离子液体（IL）1-乙基-3-甲基咪唑四氟硼酸盐（[EMIM][BF₄]）组成，并将极少量的该复合材料（2.0 μL）滴涂在丝网印刷碳电极（SPCE）的工作区域上。用PEDOT:PSS/IL复合薄膜修饰的SPCE通过循环伏安法（CV）、电化学阻抗谱（EIS）、扫描电子显微镜（SEM）、轮廓仪和静滴接触角测量进行表征。制备的PEDOT:PSS/IL复合薄膜呈现出纳米多孔微观结构，并且发现其具有高度稳定性和导电性，对优先污染物邻苯二酚具有增强的电催化性能。邻苯二酚的线性工作范围为0.1 μM - 330.0 μM，灵敏度为18.2 mA·mM·cm，计算得出的检测限（基于3倍基线噪声）为23.7 μM。当PEDOT:PSS/IL/SPCE传感器与安培法结合用于搅拌溶液中天然水样的分析时，加标样品（添加20.0 μM邻苯二酚）（ = 3）获得的精密度值分别为0.18%和0.32%，回收率值远超过99.0%。
