Design and performance of some microflow-cell potentiometric transducers

Area of Science:

• Electrochemistry
• Sensor Technology
• Analytical Chemistry

Background:

• Potentiometric transducers are crucial for chemical sensing.
• Existing designs may have limitations in flow analysis applications.
• Development of compatible and efficient transducers is needed.

Purpose of the Study:

• To design and compare three potentiometric transducers: ISFET, solid-state Ag/AgCl, and miniaturized classical Ag/AgCl.
• To assess their suitability for multiparameter flow analysis.
• To evaluate sensor performance based on different fabrication technologies.

Main Methods:

• Fabrication of ion-selective field-effect transistor (ISFET) and Ag/AgCl electrode transducers.
• Construction of transducers compatible with a pre-designed flow-cell housing.
• Preparation of potassium-selective microsensors using plasticized PVC and polysiloxane membranes with valinomycin.
• Performance characterization of the developed microsensors.

Main Results:

• Three distinct potentiometric transducer designs were successfully fabricated.
• Transducers exhibited compatibility with flow-cell housing and facilitated flow analysis.
• Potassium-selective microsensors demonstrated measurable performance.
• Comparative analysis of transducer usefulness for multiparameter flow analysis was achieved.

Conclusions:

• The developed potentiometric transducers offer viable options for flow analysis.
• Fabrication complexity and cost vary among the designs.
• Performance data supports the selection of appropriate transducers for specific multiparameter sensing tasks.