Volume: 3, 2024
3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: T002
DOI: https://doi.org/10.24326/ICDSUPL3.T002
Published online: 24 April 2024
ICDSUPL, 3, T002 (2024)
Composite materials as novel methods for modifying solid contact ion-selective electrodes
Klaudia Morawska1*, Cecylia Wardak1
1 Department of Analytical Chemistry, Faculty of Chemistry, University of Marie Curie- Sklodowska, Maria Curie-Sklodowska 3, 20-031 Lublin, Poland
* Corresponding author: klaudia.morawska@mail.umcs.pl
Abstract
Ion-selective electrodes (ISEs) are quite common sensors used in potentiometric measurements. They have been quite popular since the 70s, and their design has been constantly modified to achieve the most prosperous sensor. Among ISEs, the widest group is ion-selective electrodes with a solid contact – compared to classical electrodes, the internal electrolyte was eliminated. This resulted in an improvement of some of the parameters, the measurement became simpler, the storage and transport of the sensors became much easier, and the lifetime was extended. However, this was not an ideal solution, as the removal of the internal electrolyte, on the other hand, contributed to the deterioration of the stability and potential reversibility of ISEs. The panacea for these drawbacks turned out to be the intermediate layer, which provides good ion-electron conductivity, which in turn has a beneficial effect on both the reversibility and stability of the potential, but also on the electrical parameters of the electrodes, i.e. electrical capacitance and membrane resistance. An intermediate layer characterized by high hydrophobicity also contributed to reduce the probability of the appearance of a water layer between the polymeric membrane and the internal electrode. There are many materials used in the role of a solid contact. The most popular single-component materials include carbon materials such as carbon nanotubes and nanofibers, conductive polymers, metal and metal oxide nanoparticles, and ionic liquids, among others. Recently composite materials, i.e. materials, which consist of at least two components, are becoming popular. Over the past few years it has been proven, that the use of a solid contact material in composite form has a much more positive effect on the performance of ISEs than the use of a single component, of which the composite is made up. The presentation will explain why it is so important to use a solid contact, what composite materials are, and what types of these materials are known and utilized. The talk will end with the presentation of research results on the impact of the composite material obtained based on multiwalled carbon nanotubes and other components such as metal oxide nanoparticles or polyaniline nanofibers on the most important parameters of selected ionselective electrodes with solid contact, i.e. the slope of the characteristics, the limit of detection and the range of linearity, stability, and reversibility of the potential.
Keywords: solid contact, ion-selective electrodes, potentiometry, composite materials, composites
How to cite
K. Morawska, C. Wardak, 2024. Composite materials as novel methods for modifying solid contact ion-selective electrodes. In: 3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL3.T002