P2MM.9 - Voltammetric Thin Layer Ion Selective Membranes
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Mechanisms, Modeling and Simulation
- Author(s)
- D. Yuan, E. Bakker - Department of Inorganic and Analytical Chemistry, University of Geneva, Geneva (Switzerland)
- Pages
- 842 - 843
- DOI
- 10.5162/IMCS2018/P2MM.9
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Voltammetric thin layer ion selective membranes (ISMs) that consist of two layers, an outside thin polymeric sensing layer and an inner conducting polymer layer, are introduced here. This voltammmetric ISM can be used for sensing application within two modes: a stripping mode and a potentiometric mode. Transitions between the two modes and concentration limit for each mode are both experimentally explored and theoretically modelled by finite difference method. Simulation agrees well with experimental data. Besides its sensing application, this voltammetric thin layer ISM can also be applied for probing ion-ionophore interactions inside the membrane. Valinomycin is firstly put forward here as a model ionophore, for which formal complex formation constants with potassium and sodium are easily determined. Other molecular receptors that exihibit reversible binding kinetics are also investigated.