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A redox poly(ionic liquid) hydrogel: Facile method of synthesis and electrochemical sensing
Author(s) -
Feng Xu,
Yi Jingtu,
Zhang Wenxia,
Niu Yanhui,
Xu Lan
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48051
Subject(s) - redox , electrochemistry , sulfonic acid , polymer chemistry , ionic liquid , materials science , cyclic voltammetry , differential pulse voltammetry , thermogravimetric analysis , chemistry , inorganic chemistry , electrode , organic chemistry , catalysis
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‐(CH 2 ) 3 SO 3 − )‐CS] was produced by using chitosan (CS) crosslinking with redox‐PIL Poly(1‐vinyl‐3‐propionate imidazole phenothiazine sulfonic acid [Poly(VPI + PTZ‐(CH 2 ) 3 SO 3 − )]. The incorporation of redox‐active counter anions 3‐(phenothiazine‐10‐yl) propane 1‐sulfonic acid anions (PTZ‐(CH 2 ) 3 SO 3 − ) into cationic PIL‐polyimidazole rendered Poly(VPI + PTZ‐(CH 2 ) 3 SO 3 − ) with electron catalytic ability, ionic conductivity, and electron conductivity. Poly(VPI + PTZ‐(CH 2 ) 3 SO 3 − )‐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‐(CH 2 ) 3 SO 3 − ) 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 °C was observed in Poly(VPI + PTZ‐(CH 2 ) 3 SO 3 − )‐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 × 10 −8 to 5 × 10 −3 M and the limit of detection was 6.64 × 10 −8 M. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48051.