Compact Paper-Based Quasi-Solid-State Organic Electrochemical Transistor (QSS-OECT) for Sensing Hydrogen Peroxide

Area of Science:

• Organic electronics
• Biosensors
• Transistor technology

Background:

• Organic electronics offer biocompatible and cost-effective alternatives to traditional materials.
• Organic electrochemical transistors (OECTs) provide in situ signal amplification crucial for electrochemical biosensing.
• Existing OECTs often require larger sample volumes and complex configurations.

Purpose of the Study:

• To develop a compact, paper-based, quasi-solid-state OECT (QSS-OECT) with a vertically stacked design.
• To demonstrate the device's high performance in electrochemical sensing applications.
• To enable low-volume sample detection for versatile biosensing platforms.

Main Methods:

• Fabrication of a thick-film, paper-based QSS-OECT with integrated gate and channel.
• Electrochemical activation via pulsed gate voltage for device characterization.
• Application of the OECT for hydrogen peroxide (H2O2) detection.

Main Results:

• Achieved high transconductances up to 12.4 mS through electrochemical activation.
• Demonstrated sensitive detection of H2O2 with a sensitivity of 3.5 ± 0.3 mA/dec.
• Enabled detection using minimal sample volumes (1 μL) and in flow regimes.

Conclusions:

• The compact vertical configuration significantly reduces sample volume requirements.
• The high transconductance and sensitivity of the QSS-OECT are suitable for advanced biosensing.
• This technology presents opportunities for integration into low-cost sensors and biowearable platforms.