A modular platform based on electrospun carbon nanofibers and poly( N ‐isopropylacrylamide) hydrogel for sensor applications

MARTINEZ, MARÍA V.; ABRAHAM, GUSTAVO A.; BRUNO, MARIANO M.; ACEVEDO, DIEGO F.; BONGIOVANNI ABEL, SILVESTRE; BARBERO, CESAR A.

POLYMERS FOR ADVANCED TECHNOLOGIES

JOHN WILEY & SONS LTD

Año: 2021 vol. 32 p. 4815 - 4825

1042-7147

Modular sensor platforms are a fashion approach that allows the use of advancedmaterials to promote the evolution of portable electrochemical sensors. A modularplatform building by the combination of carbonized poly(acrylonitrile) electrospunmat (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 capacityof sorption of a redox complex tris(1,10-phenanthroline)iron(II) of the polymerichydrogel were evaluated. Moreover, the morphological aspects of the electrospunfibers before and after carbonization were analyzed. Finally, cyclic voltammetry andchronocoulometry experiments were performed to analyze the electrochemical performance of the modular platform. In this work, we demonstrated that the platformtakes advantage of the3D structure of the electrospun mat and the selective sorptionof the hydrogel for the electrochemical sensing target analyte. The iron sensing usingits complexation into the tris(1,10-phenanthroline)iron(II) redox complex wasassessed by differential pulse voltammetry (DPV). The anodic peak current showed alinear relation versus iron complex concentration in the range of 10?80 μmol L 1with a detection limit of 0.103 μmol L 1. All the results herein presented suggest thata synergistic combination of large surface area carbon fiber electrodes and ionretaining hydrogel has been achieved