The light-addressable potentiometric sensor for multi-ion sensing and imaging.

Area of Science:

• Semiconductor device physics
• Chemical sensing technology
• Analytical chemistry

Background:

• Light-addressable potentiometric sensors (LAPS) are semiconductor devices utilizing an electrolyte-insulator-semiconductor structure.
• LAPS offer the capability for spatially resolved measurements through individually addressable sensing points on a single chip.
• Modification of these sensing points allows for the detection of multiple analytes simultaneously.

Purpose of the Study:

• To describe the instrumentation and application of LAPS for multi-ion sensing.
• To demonstrate the potential of LAPS for chemical imaging.
• To introduce potentiometric imaging of microfluidic channels as a novel LAPS application.

Main Methods:

• Fabrication of LAPS with an electrolyte-insulator-semiconductor structure.
• Individual addressing of multiple sensing points on the LAPS surface using a light beam.
• Modification of sensing points with different materials for multi-analyte detection.
• Application of LAPS for potentiometric imaging of microfluidic channels.

Main Results:

• Demonstration of LAPS for simultaneous detection of multiple ions.
• Successful implementation of potentiometric imaging for analyzing microfluidic systems.
• Validation of LAPS as a versatile platform for multi-analyte sensing and spatial chemical analysis.

Conclusions:

• LAPS technology provides a robust platform for multi-analyte sensing and chemical imaging.
• The ability to individually address sensing points enhances sensor multiplexing capabilities.
• Potentiometric imaging of microfluidic channels represents a significant advancement in sensor applications.