Semipermeable Membrane-Mediated Hydrogen Bonding Interface for Fabricating High-Performance Pure PEDOT:PSS Hydrogels

Area of Science:

• Materials Science
• Polymer Chemistry
• Bioelectronics

Background:

• Conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hydrogels are promising for bioelectronic interfaces due to their mechanical and electrochemical properties.
• Improving PEDOT:PSS hydrogel performance often requires inducing phase separation, but simple, mild fabrication methods are challenging.
• The intrinsic core-shell microstructure of PEDOT:PSS presents challenges for performance enhancement.

Purpose of the Study:

• To develop a straightforward and mild strategy for fabricating high-performance pure PEDOT:PSS hydrogels.
• To control the hierarchical distribution of PEDOT and PSS phases within the hydrogel.
• To enhance the mechanical and electrochemical properties of PEDOT:PSS hydrogels for bioelectronic applications.

Main Methods:

• Utilized a semipermeable membrane to create a hydrogen bonding interface for controlled phase separation.
• Leveraged ethanol's attraction to PSS to accumulate it at the engineered interface.
• Facilitated PEDOT aggregation via π-π conjugation and subsequent removal of the separated PSS phase.

Main Results:

• Achieved controllable hierarchical two-phase distribution of PEDOT and PSS.
• Formed pure PEDOT:PSS hydrogels with significantly improved mechanical and electrochemical performances.
• Demonstrated a simple, mild, and effective strategy for PEDOT:PSS hydrogel fabrication.

Conclusions:

• The semipermeable membrane-mediated hydrogen bonding interface provides a universal and effective strategy for designing conductive hydrogels.
• This method enables controlled phase separation, leading to enhanced hydrogel properties.
• The developed PEDOT:PSS hydrogels are suitable for advanced bioelectronic applications.