A novel electroactive and pH-responsive microgel was successfully synthesized. The obtained microgel was based on acrylic acid, dopamine methacrylamide and -bis(acryloyl)cystamine as the crosslinker. Using the distillation precipitation polymerization method, spherical, smooth-surface microgel particles of 400 nm in diameter were obtained. The presence of dopamine groups in the polymer network was confirmed with cyclic voltammetry and NMR spectroscopy. The dependence of microgel hydrodynamic diameter on pH was investigated using the DLS technique. The presence of -S–S- groups in the microgel particle was used to modify the Au electrode surface by chemisorption. The attachment was monitored with the QCM-D technique. The obtained microgel was successfully anchored to the Au regular- and microelectrode surfaces. The electrochemical properties of the modified electrodes were promising. It was found that modified electrodes exhibited potentially useful pH-sensing properties. Modification of Au microelectrode surface with the environmentally sensitive and electroactive microgel monolayer is a novel, innovative approach.

中文翻译：

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基于多巴胺改性聚丙烯酸的单层微凝胶颗粒用于电化学 pH 传感

成功合成了一种新型电活性和pH响应性微凝胶。所获得的微凝胶基于丙烯酸、多巴胺甲基丙烯酰胺和双(丙烯酰基)胱胺作为交联剂。采用蒸馏沉淀聚合法，得到直径400 nm的球形、表面光滑的微凝胶颗粒。通过循环伏安法和核磁共振波谱法证实了聚合物网络中多巴胺基团的存在。使用 DLS 技术研究了微凝胶流体动力学直径对 pH 的依赖性。微凝胶颗粒中存在的-S–S-基团用于通过化学吸附来修饰金电极表面。使用 QCM-D 技术监测附着情况。所获得的微凝胶成功锚定到金规则电极和微电极表面。修饰电极的电化学性能很有前景。研究发现，修饰电极表现出潜在有用的 pH 传感特性。使用环境敏感和电活性微凝胶单层对金微电极表面进行改性是一种新颖的创新方法。