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A Printable OECT for Simple Integration in Nitrocellulose-Based Assays.

Martina Cicolini1,2, Ali Solgi3, Lorenzo Vigna1,2

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Summary
This summary is machine-generated.

This study presents a novel printable Organic Electrochemical Transistor (OECT) for sensitive, quantitative point-of-care diagnostics. The device enhances lateral flow assays by providing reliable detection of analytes like dopamine.

Keywords:
3D printed electronicsOECTadditive manufacturingorganic semiconductorspaper-based sensors, PEDOT:PSS

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Paper-based biosensors, particularly lateral flow assays (LFAs), offer accessible point-of-care (POC) diagnostics but suffer from low sensitivity and qualitative results.
  • Organic Electrochemical Transistors (OECTs) provide high sensitivity, low voltage operation, and biological compatibility, making them promising for advanced biosensing.
  • There is a need for quantitative, sensitive diagnostic tools that can complement existing POC methods like LFAs.

Purpose of the Study:

  • To develop a printable Organic Electrochemical Transistor (OECT) integrated onto a cellulose membrane for biochemical sensing.
  • To create a microfluidic platform that protects the OECT's active components while enabling sample interaction.
  • To evaluate the OECT's performance in detecting dopamine (DA) oxidation for quantitative POC diagnostics.

Main Methods:

  • Fabrication of a printable OECT using dispense-printed silver electrodes, a PEDOT:PSS channel and gate, and a solid-state electrolyte on a cellulose membrane.
  • Design of a passive microfluidic system with a hydrophobic barrier to isolate the OECT's dry area from the liquid sample.
  • Utilized an extended gate design where only the PEDOT:PSS gate interacts with the analyte in the sample, preventing contamination.

Main Results:

  • The printable OECT demonstrated sensitivity to dopamine (DA) oxidation, with a limit of detection of 0.01 mM.
  • Significant variations in transfer characteristics, transconductance, and on/off ratio were observed upon DA oxidation.
  • The device achieved a maximum transconductance of approximately 4 mS, indicating high performance.

Conclusions:

  • The developed printable OECT system provides a sensitive and quantitative method for biochemical sensing at the point-of-care.
  • This technology can be integrated into affordable biochemical assays to enhance the reliability of LFAs.
  • The OECT offers a promising platform for developing next-generation diagnostic tools that provide quantitative results.