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Thermal Processing Creates Water-Stable PEDOT:PSS Films for Bioelectronics.

Siddharth Doshi1, Margaux O A Forner2, Pingyu Wang1

  • 1Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA.

Advanced Materials (Deerfield Beach, Fla.)
|March 3, 2025
PubMed
Summary
This summary is machine-generated.

High-temperature baking makes PEDOT:PSS films water-stable for bioelectronics. This simple thermal treatment enhances volumetric capacitance and enables 3D patterning without compromising performance.

Keywords:
conductive polymerselectrochemical transistorsimplantable probeslaser patterningpolymer processing

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Area of Science:

  • Bioelectronics
  • Materials Science
  • Organic Electronics

Background:

  • Organic mixed ionic-electronic conductors, like PEDOT:PSS, are crucial for bioelectronic devices due to their mechanical and biocompatible properties.
  • PEDOT:PSS is widely used for its conductivity and processability but suffers from water dispersibility, limiting its use in biological environments.
  • Current methods to improve water stability, such as chemical cross-linking with (3-glycidyloxypropyl)trimethoxysilane (GOPS), often reduce electrical performance.

Purpose of the Study:

  • To develop a simple and effective method for enhancing the water stability of PEDOT:PSS films for bioelectronic applications.
  • To investigate the impact of thermal treatment on the stability and electrical properties of PEDOT:PSS.
  • To explore the potential of thermal treatment for fabricating 3D microstructures of PEDOT:PSS.

Main Methods:

  • Thin films of PEDOT:PSS were subjected to high-temperature baking (>150 °C) for a short duration (≈ 2 min).
  • Water stability was assessed in vitro and in vivo over extended periods (>20 days).
  • Volumetric capacitance was measured and compared to chemically cross-linked films.
  • Focused femtosecond laser was used to apply thermal energy for direct patterning of 3D microstructures.

Main Results:

  • Heat-treated PEDOT:PSS films demonstrated water stability comparable to chemically cross-linked films.
  • The thermal treatment maintained film performance for over 20 days in both in vitro and in vivo conditions.
  • Elimination of insulating cross-linkers resulted in a threefold increase in volumetric capacitance.
  • Direct patterning of 3D PEDOT:PSS microstructures was achieved using a femtosecond laser.

Conclusions:

  • High-temperature, short-duration baking is an effective method to achieve water stability in PEDOT:PSS films for bioelectronics.
  • Thermal treatment offers superior volumetric capacitance compared to chemical cross-linking methods.
  • This fabrication technique is compatible with existing manufacturing workflows and various substrates, facilitating rapid adoption in bioelectronics.
  • The method enables precise 3D patterning of PEDOT:PSS, expanding its application potential.