A redox poly(ionic liquid) hydrogel: Facile method of synthesis and electrochemical sensing

摘要

In this article, a redox-responsive poly(ionic liquid) (redox-PIL) hydrogel Poly(1-vinyl-3-propionate imidazole phenothiazine sulfonic acid)-chitosan [Poly(VPI(+)PTZ-(CH2)(3)SO3-)-CS] was produced by using chitosan (CS) crosslinking with redox-PIL Poly(1-vinyl-3-propionate imidazole phenothiazine sulfonic acid [Poly(VPI(+)PTZ-(CH2)(3)SO3-)]. The incorporation of redox-active counter anions 3-(phenothiazine-10-yl) propane 1-sulfonic acid anions (PTZ-(CH2)(3)SO3-) into cationic PIL-polyimidazole rendered Poly(VPI(+)PTZ-(CH2)(3)SO3-) with electron catalytic ability, ionic conductivity, and electron conductivity. Poly(VPI(+)PTZ-(CH2)(3)SO3-)-CS combines the properties of hydrogel and redox-PIL, thus offering intrinsic porous conducting frameworks and promoting the transport of charges, ions, and molecules, leading hydrogel with excellent electrochemical properties. The crosslinking occurrence of Poly(VPI(+)PTZ-(CH2)(3)SO3-) and CS resulting from the synthetic process of hydrogel was verified by differential scanning calorimetry and thermogravimetric analysis. A three-dimensional polymer network hydrogel with good biocompatibility and permeability was formed after crosslinking. In addition, only 64% weight loss within 600 degrees C was observed in Poly(VPI(+)PTZ-(CH2)(3)SO3-)-CS representing its thermally stable performance. When used as an electrochemical sensor, the hydrogel-modified gold electrode improved the electrocatalytic oxidation of cysteine. Differential pulse voltammetry results indicated that the detection range was from 5 x 10(-8) to 5 x 10(-3) M and the limit of detection was 6.64 x 10(-8) M. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48051.