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Surface modification with thermoresponsive polymer brushes for a switchable electrochemical sensor

机译：用热敏聚合物刷对可切换电化学传感器进行表面改性

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Elaboration of switchable surfaces represents an interesting way for the development of a new generation of electrochemical sensors. In this paper, a method for growing thermoresponsive polymer brushes from a gold surface pre-modified with polyethyleneimine (PEI), subsequent layer-by-layer polyelectrolyte assembly and adsorption of a charged macroinitiator is described. We propose an easy method for monitoring the coil-to-globule phase transition of the polymer brush using an electrochemical quartz crystal microbalance with dissipation (E-QCM-D). The surface of these polymer modified electrodes shows reversible switching from the swollen to the collapsed state with temperature. As demonstrated from E-QCM-D measurements using an original signal processing method, the switch is operating in three reversible steps related to different interfacial viscosities. Moreover, it is shown that the one electron oxidation of ferrocene carboxylic acid is dramatically affected by the change from the swollen to the collapsed state of the polymer brush, showing a spectacular 86% decrease of the charge transfer resistance between the two states.
机译：精心设计可切换表面代表了开发新一代电化学传感器的一种有趣方式。在本文中，描述了一种方法，该方法用于从用聚乙烯亚胺（PEI）预先修饰的金表面生长热敏性聚合物刷，随后进行逐层聚电解质组装并吸附带电的大分子引发剂。我们提出了一种使用耗散电化学石英晶体微量天平来监测聚合物刷的线圈到球体相变的简便方法。这些聚合物改性电极的表面显示出随温度从溶胀状态到塌陷状态的可逆转换。如使用原始信号处理方法的E-QCM-D测量所证明的，该开关以与不同界面粘度有关的三个可逆步骤进行操作。此外，显示出二茂铁羧酸的单电子氧化受到聚合物刷从溶胀状态到塌陷状态的变化的显着影响，表明这两种状态之间的电荷转移电阻显着降低了86％。

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