Highly Sensitive Glucose Sensor Based on Organic Electrochemical Transistor with Modified Gate Electrode.

Area of Science:

• Electrochemistry
• Nanotechnology
• Biosensors

Background:

• Organic electrochemical transistors (OECTs) offer potential for biosensing applications.
• Efficient detection of hydrogen peroxide (H2O2) is crucial for glucose sensing.
• Platinum nanoparticles (Pt NPs) exhibit excellent catalytic properties.

Purpose of the Study:

• To develop a highly sensitive chip-based glucose sensor by integrating an OECT with a microfluidic channel.
• To investigate the role of glucose oxidase (GOx) and Pt NPs in enhancing glucose detection.
• To achieve a low detection limit and rapid response time for glucose monitoring.

Main Methods:

• Fabrication of an OECT with a gate electrode functionalized with GOx and Pt NPs.
• Integration of a polydimethylsiloxane (PDMS) microfluidic channel with the OECT.
• Utilized a bias-free two-step dip coating method for Pt NP deposition followed by UV-Ozone treatment.

Main Results:

• The developed sensor demonstrated extremely high sensitivity and a low detection limit of 0.1 μM for glucose.
• The Pt NPs significantly enhanced the catalytic oxidation of H2O2, improving sensor performance.
• The integrated microfluidic channel enabled rapid detection (~1 min) with minimal analyte consumption (30 μL).

Conclusions:

• The OECT-based glucose sensor with Pt NPs is a promising platform for sensitive and rapid glucose detection.
• The sensor's compact size, high sensitivity, and low detection limit support its potential for portable and real-time applications.
• This technology holds potential for noninvasive glucose monitoring in various applications.