Department of Nanotechnology, Faculty of Chemistry, Urmia University, Urmia, Iran.
Institute of Nanotechnology, Urmia University, Urmia, Iran.
Sci Rep. 2023 May 31;13(1):8816. doi: 10.1038/s41598-023-36103-6.
The aim of this research is to develop an electrochemical sensor based on a conducting polymer, polyaniline, and a cationic polymer, poly(diallyldimethylammonium chloride), reinforced with graphene oxide nanosheets functionalized with acrylic acid. The two-dimensional nature of acrylic acid functionalized graphene oxide nanosheets and clusters made of conductive polymers and acrylic acid functionalized graphene oxide nanosheets were confirmed by microscopic tests. The prepared nanocomposite was deposited on the glassy carbon electrode in order to prepare an electrochemical sensor for the detection of arsenic by cyclic voltammetry and differential pulse voltammetry methods. It should be mentioned that the presence of acrylic acid functionalized graphene oxide nanosheets increases the surface area due to the nano size effect and better dispersion of this nanomaterial, poly(diallyldimethylammonium chloride), increases the adsorption capacity of the analyte due to electrostatic interaction between the negatively charged analyte and positively charged surface, and polyanilin increases the charge transfer rate due to the good conductivity. The results show that the prepared electrode has a sensitivity equal to 1.79 A/M with 0.12 μM as the detection limit. The proposed sensor could be used for the determination of total inorganic arsenic by first oxidative pretreatment for conversion of As(III) to As(V).
本研究旨在开发一种基于导电聚合物聚苯胺和阳离子聚合物聚二烯丙基二甲基氯化铵的电化学传感器，该传感器用功能化的氧化石墨烯纳米片增强，其中氧化石墨烯纳米片用丙烯酸进行了功能化。通过微观测试证实了具有二维性质的丙烯酸功能化氧化石墨烯纳米片以及由导电聚合物和丙烯酸功能化氧化石墨烯纳米片组成的团簇的存在。为了通过循环伏安法和差分脉冲伏安法检测砷，将制备的纳米复合材料沉积在玻碳电极上，以制备电化学传感器。应当指出的是，由于纳米尺寸效应和更好的纳米材料分散性，存在丙烯酸功能化氧化石墨烯纳米片会增加表面积，聚二烯丙基二甲基氯化铵通过带负电荷的分析物与带正电荷的表面之间的静电相互作用会增加分析物的吸附能力，聚苯胺会增加由于良好的导电性，增加电荷转移速率。结果表明，所制备的电极具有等于 1.79 A/M 的灵敏度，检测限为 0.12 μM。该传感器可用于通过首先进行氧化预处理将 As(III)转化为 As(V)来测定总无机砷。
