Salhi Ouissal, Ez-Zine Tarik, Oularbi Larbi, El Rhazi Mama
Laboratory of Materials Membranes and Environment, Faculty of Sciences and Technologies, University Hassan II Casablanca, Mohammedia, Morocco.
Front Chem. 2022 Mar 16;10:870393. doi: 10.3389/fchem.2022.870393. eCollection 2022.
A novel electrochemical sensor based on conducting polymer and multi-walled carbon nanotubes was reported for the detection of nitrite ions (NO ). The hybrid material poly 1,8-Diaminonaphthalene (poly 1,8-DAN)/functionalized multi-walled carbon nanotubes (f-MWCNT) was prepared by using a simple electrochemical approach which is based on the deposition of functionalized multi-walled carbon nanotubes (f-MWCNT) on the surface of the electrode followed by the electropolymerization of 1,8-DAN using cyclic voltammetry. The morphology and the electro-catalytic properties of the obtained electrodes were investigated with Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM), Cyclic Voltammetry (CV), and Electrochemical Impedance Spectroscopy (EIS) showing an improvement of the electronic transfer due to the synergic effect between the proprieties of poly 1,8-DAN and f-MWCNT. Under the optimum experimental conditions, the poly 1,8-DAN/f-MWCNT/CPE exhibited excellent electro-catalytic activity towards nitrite detection. The nitrite anodic peak potential decreased by 210 mV compared to the bare carbon paste electrode. The calibration plot of nitrite detection was linear in the range of concentration from 300 to 6500 nM with a low detection limit of 75 nM.
报道了一种基于导电聚合物和多壁碳纳米管的新型电化学传感器，用于检测亚硝酸根离子（NO ）。通过一种简单的电化学方法制备了杂化材料聚1,8 - 二氨基萘（聚1,8 - DAN）/功能化多壁碳纳米管（f - MWCNT），该方法基于将功能化多壁碳纳米管（f - MWCNT）沉积在电极表面，然后使用循环伏安法对1,8 - DAN进行电聚合。利用傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）、循环伏安法（CV）和电化学阻抗谱（EIS）研究了所得电极的形态和电催化性能，结果表明由于聚1,8 - DAN和f - MWCNT特性之间的协同效应，电子转移得到了改善。在最佳实验条件下，聚1,8 - DAN/f - MWCNT/CPE对亚硝酸盐检测表现出优异的电催化活性。与裸碳糊电极相比，亚硝酸根阳极峰电位降低了210 mV。亚硝酸盐检测的校准曲线在浓度范围为300至6500 nM时呈线性，检测限低至75 nM。
