Membrane characterization of anion-selective CHEMFETs by impedance spectroscopy.
Membrane characterization of anion-selective CHEMFETs by impedance spectroscopy.
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DOI：
10.1021/ac990721k
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发表时间：
2000-01
影响因子：
7.4
通讯作者：
M. Antonisse;B. Snellink-Ruël;R. J. Lugtenberg;J. Engbersen;A. van den Berg;D. Reinhoudt
中科院分区：
文献类型：
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作者：
M. Antonisse;B. Snellink-Ruël;R. J. Lugtenberg;J. Engbersen;A. van den Berg;D. Reinhoudt
阻抗谱可用于确定几个膜参数对阴离子选择性CHEMFET的膜电阻的影响。膜中的铵位点的浓度、阴离子-受体络合物的化学计量和膜基质的极性是特别重要的。通常，聚硅氧烷膜的电阻高于PVC膜的电阻。然而，在聚硅氧烷膜中，膜极性可受到聚硅氧烷链上极性取代基的类型或浓度的影响。具有25摩尔%的极性砜取代基的聚硅氧烷离子交换膜表现出与NPOE增塑的PVC膜相同的电导率。值得注意的是，阳离子选择性聚硅氧烷膜的膜电阻低得多，并且对取代基的依赖性小得多。
Impedance spectroscopy can be used to determine the influence of several membrane parameters on the membrane resistance of anion selective CHEMFETs. The concentration of the ammonium sites in the membrane, the anion-receptor complex stoichiometry, and the polarity of the membrane matrix are of particular importance. In general the resistance of polysiloxane membranes is higher than that of PVC membranes. However, in polysiloxane membranes the membrane polarity can be influenced by the type or concentration of polar substituents on the polysiloxane chain. Polysiloxane ion-exchange membranes with 25 mol% of polar sulfone substituents exhibit the same conductance as NPOE plasticized PVC membranes. Remarkably, the membrane resistance of cation-selective polysiloxane membranes is much lower and is much less dependent on the substituents.