Agrisuelas Jerónimo, González-Sánchez María-Isabel, Gómez-Monedero Beatriz, Valero Edelmira
Department of Physical Chemistry, School of Industrial Engineers, University of Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
Polymers (Basel). 2018 Jan 6;10(1):48. doi: 10.3390/polym10010048.
In the present paper, poly(azure A) (PAA) films were electrosynthetized in the presence of different doping anions on disposable screen-printed carbon electrodes (SPCEs). The anions used included inorganic monoatomic (chloride and fluoride), inorganic polyatomic (nitrate and sulfate) and organic polyatomic (dodecyl sulfate, DS) species. The coated electrodes thus obtained were characterized by electrochemical techniques and SEM. They showed improved electrocatalytic activities towards hydrogen peroxide oxidation compared to that of a bare SPCE. In particular, the insertion of DS anions inside PAA films provided a special sensitivity to the electrocatalysis of H₂O₂, which endowed these electrodes with promising analytical features for H₂O₂ quantification. We obtained a wide linear response for H₂O₂ within a range of 5 µM to 3 mM and a limit of detection of 1.43 ± 0.10 µM (signal-to-noise ratio of 3). Furthermore, sensitivity was 72.4 ± 0.49 nA·µM∙cm at a relatively low electrocatalytic oxidation overpotential of 0.5 V vs. Ag. The applicability of this boosted system was tested by the analysis of H₂O₂ in commercial samples of a hair lightener and an antiseptic and was corroborated by spectrophotometric methods.
在本论文中，聚天青A（PAA）薄膜在不同掺杂阴离子存在的情况下，于一次性丝网印刷碳电极（SPCEs）上进行电合成。所使用的阴离子包括无机单原子（氯离子和氟离子）、无机多原子（硝酸根离子和硫酸根离子）以及有机多原子（十二烷基硫酸根离子，DS）物种。由此获得的涂覆电极通过电化学技术和扫描电子显微镜进行表征。与裸SPCE相比，它们对过氧化氢氧化显示出更高的电催化活性。特别地，DS阴离子插入PAA薄膜内部赋予了对H₂O₂电催化的特殊敏感性，这使得这些电极具有用于H₂O₂定量分析的良好分析特性。我们在5 μM至3 mM的范围内获得了对H₂O₂的宽线性响应，检测限为1.43±0.10 μM（信噪比为3）。此外，在相对于银的0.5 V相对较低的电催化氧化过电位下，灵敏度为72.4±0.49 nA·µM∙cm。通过分析头发漂白剂和防腐剂的商业样品中的H₂O₂对该增强系统的适用性进行了测试，并通过分光光度法得到了证实。
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