Modular sensor platforms are a fashion approach that allows the use of advanced materials to promote the evolution of portable electrochemical sensors. A modular platform building by the combination of carbonized poly(acrylonitrile) electrospun mat (C-PAN; fiber diameter ca. 300 nm) and a poly(N-isopropylacrylamide; PNIPAm) hydrogel was assayed. The individual components of the platform were physicochemically characterized before assembling. The swelling behavior and the capacity of sorption of a redox complex tris(1,10-phenanthroline)iron(II) of the polymeric hydrogel were evaluated. Moreover, the morphological aspects of the electrospun fibers before and after carbonization were analyzed. Finally, cyclic voltammetry and chronocoulometry experiments were performed to analyze the electrochemical performance of the modular platform. In this work, we demonstrated that the platform takes advantage of the3D structure of the electrospun mat and the selective sorption of the hydrogel for the electrochemical sensing target analyte. The iron sensing using its complexation into the tris(1,10-phenanthroline)iron(II) redox complex was assessed by differential pulse voltammetry (DPV). The anodic peak current showed a linear relation versus iron complex concentration in the range of 10–80 μmol L⁻¹ with a detection limit of 0.103 μmol L⁻¹. All the results herein presented suggest that a synergistic combination of large surface area carbon fiber electrodes and ion retaining hydrogel has been achieved.

中文翻译：

---

基于电纺碳纳米纤维和聚（N-异丙基丙烯酰胺）水凝胶的模块化平台，用于传感器应用

模块化传感器平台是一种时尚方法，允许使用先进材料来促进便携式电化学传感器的发展。由碳化聚（丙烯腈）电纺毡（C-PAN；纤维直径约 300 nm）和聚（N-异丙基丙烯酰胺；PNIPAm) 水凝胶进行了分析。在组装之前，对平台的各个组件进行了物理化学表征。评估了聚合物水凝胶的氧化还原配合物三（1,10-菲咯啉）铁（II）的溶胀行为和吸附能力。此外，分析了碳化前后电纺纤维的形态方面。最后，进行循环伏安法和计时库仑法实验以分析模块化平台的电化学性能。在这项工作中，我们证明了该平台利用电纺垫的 3D 结构和水凝胶对电化学传感目标分析物的选择性吸附。铁感应使用其络合到 tris(1, 通过微分脉冲伏安法 (DPV) 评估 10-菲咯啉) 铁 (II) 氧化还原复合物。阳极峰值电流在 10-80 μmol L 范围内与铁络合物浓度呈线性关系^-1的检测限为 0.103 μmol L ^-1。本文呈现的所有结果表明，大表面积碳纤维电极和离子保留水凝胶的协同组合已经实现。