Sensors from polymer modified electrodes
Sensors from polymer modified electrodes
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聚合物修饰电极传感器
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
C. Martin
中科院分区：
文献类型：
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作者：
M. Espenscheid;A. Ghatak;R. Moore;R. Penner;M. Szentirmay;C. Martin
介绍了离子膜修饰电极的结构和操作，包括离子交换过程的基本原理。一系列的烷基取代的吡啶阳离子在Nafion的离子交换选择性系数已被测量，这些系数的大值归因于疏水效应;自由能关系的系数的离子的大小已经建立。使用的Nafion涂层电极在体内测量的神经递质和低浓度存在的分析物的预浓缩进行了讨论。报道了离聚物修饰电极响应动力学的实验，新型离子导电复合聚合物膜可以实现非常高的离子传输速率。氧化还原基团如二茂铁的共价连接允许通过切换二茂铁的氧化还原状态来控制抗衡离子的释放。
The construction and operation of ionomer-film modified electrodes are described, including the fundamentals of the ion-exchange processes. Ion-exchange selectivity coefficients for a series of alkylsubstituted pyridinium cations in Nafion have been measured and the large values of these coefficients are attributed to the hydrophobic effect; a free-energy relationship relating the coefficient to the size of the ion has been established. The use of Nafion-coated electrodes for the in vivo measurement of neurotransmitters and for the preconcentration of analytes present in low concentration is discussed. Experiments on the dynamics of the response of ionomer modified electrodes are reported and very high ionic transport rates can be achieved for novel ionically conductive composite polymer membranes. The covalent attachment of redox groups such as ferrocene allows one to control the release of counterions by switching the redox state of the ferrocene.