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Actively Driven Light-Addressable Sensor/Actuator System for Automated pH Control for the Integration in

Rene Welden^1,2, Anirban Das³, Steffi Krause³

¹Institute of Nano- and Biotechnologies (INB), Aachen University of Applied Sciences, Heinrich-Mußmann-Str. 1, Jülich 52428, Germany.

|March 6, 2024

Summary

This study introduces light-controlled semiconductor sensors and electrodes for microfluidic systems, enabling precise pH gradient generation and measurement without internal components.

Keywords:

lab-on-a-chip light-addressable electrode light-addressable potentiometric sensor microfluidic setup pH-change detection

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Area of Science:

Microfluidics
Chemical Sensing
Semiconductor Devices

Background:

Microfluidic systems face challenges integrating internal sensors and actuators.
External control of microfluidic environments is crucial for biological and chemical applications.

Purpose of the Study:

To demonstrate a microfluidic system with externally controlled, light-addressable sensors and actuators.
To enable precise spatial and temporal control of pH gradients within microchannels.

Main Methods:

Integration of a light-addressable potentiometric sensor (Al/Si/SiO2/Si3N4) for pH measurement.
Incorporation of light-addressable electrodes (glass/SnO2:F/TiO2) for photoelectrocatalytic pH control.
Simultaneous operation of sensor and electrode within a microfluidic setup under static and dynamic flow.

Main Results:

Achieved pH changes up to ΔpH 3.52 under dynamic flow conditions.
Demonstrated tailored pH gradients perpendicular to flow (ΔpH 1.42).
Showcased stepwise pH increase via synchronous light-addressable electrode illumination.

Conclusions:

Externally light-controlled semiconductor devices offer a viable solution for advanced microfluidic control.
The developed system allows for precise generation and monitoring of pH gradients in microfluidic channels.
This technology has potential applications in lab-on-a-chip devices and chemical analysis.