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Enhancing Conductivity in 3D Organic Electrochemical Transistors with PEDOT-Tetramethacrylate Integration
Viktorija Reinikovaite1,2, İpek Sarıer3, Martin Jönsson-Niedziółka2
1State Research Institute Center for Physical Sciences and Technology, Vilnius 10257, Lithuania.
ACS Materials Letters
|June 29, 2026
Summary
Researchers developed a novel conductive hydrogel composite for bioelectronics. This material enhances conductivity and biocompatibility, paving the way for advanced organic electrochemical transistors (OECTs) and other bioelectronic devices.
Area of Science:
- Materials Science
- Biomedical Engineering
- Electrochemistry
Background:
- Electroconductive hydrogels are crucial for bioelectronic applications due to their conductivity and biocompatibility.
- Existing conductive hydrogels face challenges like PEDOT aggregation, low conductivity, and cytotoxicity.
- Mimicking the extracellular matrix is key for seamless integration in biological systems.
Purpose of the Study:
- To create a homogeneous, conductive, and cytocompatible hydrogel composite for organic electrochemical transistors (OECTs).
- To overcome limitations of current conductive hydrogels, specifically aggregation, conductivity, and cell toxicity.
- To establish a foundation for next-generation bioelectronics through advanced hydrogel development.
Main Methods:
- Synthesized a three-component hydrogel composite using methacrylated gelatin (GelMA), PEDOT:PSS, and tetramethacrylated PEDOT:TOS (PEDOT-TMA:TOS).
- Characterized the hydrogel's electrochemical performance, including impedance, sheet resistance, and conductivity.
- Fabricated and tested OECTs using the developed hydrogel composite and performed live/dead assays for cytocompatibility.
Main Results:
- Achieved a five-order impedance reduction, sheet resistance of 1.53 kΩ sq-1, and conductivity of 2.9 S m-1.
- Fabricated OECTs demonstrated a threshold voltage of 0.216 V, transconductance of 2.1 mS, and an on/off ratio of 156.7.
- Live/dead assays confirmed excellent cytocompatibility, attributed to efficient radical scavenging during cross-linking.
Conclusions:
- The developed hydrogel composite offers superior electrochemical performance and cytocompatibility compared to existing materials.
- This 3D conductive hydrogel network is suitable for cellular integration, addressing key challenges in bioelectronics.
- The findings provide a foundation for advanced bioelectronic devices such as sensors, neural interfaces, and tissue engineering scaffolds.
