Supramolecular Conductive Hydrogels With Homogeneous Ionic and Electronic Transport.

Area of Science:

• Materials Science
• Polymer Chemistry
• Bioelectronics

Background:

• Mechanically resilient hydrogels are crucial for bridging biology and electronics.
• Electronically conductive polymers, like poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), are used in supramolecular hydrogels.
• Inhomogeneous morphologies of PEDOT:PSS limit mechanical properties and ion-electron interactions.

Purpose of the Study:

• To achieve supramolecular conductive hydrogels with homogeneous ionic and electronic transport.
• To overcome limitations of inhomogeneous conducting polymers in bioelectronic interfaces.
• To develop advanced materials for improved bioelectronic devices.

Main Methods:

• Homogeneous incorporation of a hydrophilic self-doped conducting polymer, S-PEDOT.
• Polymerization of S-PEDOT within a supramolecular polymer network template.
• Utilizing high-binding affinity host-guest crosslinks for network mediation.

Main Results:

• Achieved hydrogels with high toughness (620 kJ m⁻³), stretchability (>1000%), softness (10.5 kPa), and conductivity (5.8 S cm⁻¹).
• Demonstrated superior mechanical and transport properties compared to inhomogeneous PEDOT:PSS hydrogels.
• Exhibited higher charge injection capacitance and lower skin impedance than commercial electrodes.

Conclusions:

• Homogeneous conductive hydrogels offer enhanced performance for bioelectronic interfaces.
• The developed material architecture enables fully dryable and reswellable electronic devices, improving reusability and handling.
• This approach presents a promising direction for future conductive hydrogel synthesis and bioelectronic applications.