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首页> 外文期刊>Electroanalysis >Preparation and Characterization of GCE Coatings Combining DDDMAB and PDADMAC with FAD and HCM for Electrocatalytic Detection of Oxygen and Sulfur Oxoanions
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Preparation and Characterization of GCE Coatings Combining DDDMAB and PDADMAC with FAD and HCM for Electrocatalytic Detection of Oxygen and Sulfur Oxoanions

机译：DDDMAB和PDADMAC与FAD和HCM结合的GCE涂层的制备和表征，用于电催化检测氧和硫氧阴离子

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摘要

Electrochemically active hybrid coatings based on cationic films, didodecyldimethylammonium bromide (DDDMAB), and poly(diallyldimethylammonium chloride) (PDADMAC) are prepared on glassy carbon electrode surface by cycling the film-covered electrode repetitively in a pH 7 solution containing flavin adenine dinucleotide (FAD), and anionic hexacyanometalate (HCM) complexes, Fe(CN)(6)(3-) and Ru(CN)(6)(4-). Cyclic voltammetric features of hybrid coatings resemble that of electron transfer process of surface-confined redox species. Electrochemical quartz crystal microbalance (EQCM) was used to monitor the deposition of FAD on DDDMAB film. Cyclic voltammetric peak potentials of modified electrode were found to be shifted to more negative region with increasing pH of contacting solution with a slope value of 63.3mV per pH unit. The electrocatalytic behavior of FAD-modified DDDMAB-coated GCE and hybrid film electrodes was tested towards reduction of oxygen, S2O82-, SO52- and oxidation of SO32-. The application of FAD-modified DDDMAB-coated GCE for S2O82- estimation was demonstrated in amperometric mode. The sensitivity and detection limit (S/N = 3) were 267.6 mu A mM(-1) and 2 x 10(-6) M, respectively.
机译：通过在含碳黄素腺嘌呤二核苷酸（FAD）的pH 7溶液中反复循环覆膜的电极，在玻璃碳电极表面制备基于阳离子膜，十二烷基二甲基溴化铵（DDDMAB）和聚二烯丙基二甲基氯化铵（PDADMAC）的电化学活性杂化涂层。 ）和阴离子六氰基金属酸盐（HCM）络合物Fe（CN）（6）（3-）和Ru（CN）（6）（4-）。杂化涂层的循环伏安特性类似于表面受限氧化还原物质的电子转移过程。电化学石英晶体微量天平（EQCM）用于监测FAD在DDDMAB膜上的沉积。发现随着接触溶液pH值的增加，修饰电极的循环伏安峰电位移至更负的区域，每pH单位的斜率值为63.3mV。测试了FAD修饰的DDDMAB涂层GCE和杂化膜电极的电催化行为，以减少氧气，S2O82-，SO52-和SO32-的氧化。在安培模式下证明了FAD修饰的DDDMAB涂层GCE在S2O82估计中的应用。灵敏度和检测极限（S / N = 3）分别为267.6μAmM（-1）和2 x 10（-6）M。

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