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Au@Pt Core-Shell Nanoparticles as Solid Contacts in Ion Selective Electrodes for Ammonium Detection
AuthorZaeimian, Masoumeh S.
Electrical and Biomedical Engineering
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In this thesis, we present a novel ion selective electrode for ammonium detection in human perspiration. Ion selective electrodes provide the sensing capability to measure a specific ion in a sample. This makes them applicable in many areas, such as environmental monitoring, clinical analysis, and process control. The proposed ion-selective electrode contains solid contact instead of internal solutions as is the case for conventional ion selective electrodes. This property of the proposed electrode makes it smaller and maintenance-free.So far, different kinds of material have been used as solid contacts in ion selective electrodes. In this work, we propose the use of gold (Au) and Platinum (Pt) for the solid contact of the ion selective electrode. Since, Au@Pt core-shell nanoparticles exhibit simple particle synthesis, high stability, and large surface of particle for high electrochemical activities, using them as a transducer section in an ion selective electrode for ammonium detection is proposed in this work. To this end, we synthesized these two elements as nanoparticles with a core-shell structure. The core is made of Au and Pt forms the surrounding dendritic shell with high surface area. The utilized approach reduces the complexity of Au@Pt synthesis to one step of synthesis and helps in consuming less Platinum.Finally, the test results for different ISE configurations and various concentrations of ammonium solutions show that the proposed method has good response time and stability characteristics compared to other configurations. Furthermore, selectivity, light and pH test results demonstrated suitability of the proposed ion selective electrode for real-world applications.