Lanternarene-Based Self-Sorting Double-Network Hydrogels for Flexible Strain Sensors.

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Conductive flexible hydrogels are crucial for wearable sensors but often suffer from poor mechanical properties.
• Limitations in mechanical strength hinder the widespread application of conductive polymers in flexible electronics.

Purpose of the Study:

• To fabricate a double network hydrogel with enhanced conductivity and mechanical properties.
• To explore the potential of lantern[33]arene-based hydrogen organic framework nanofibers in hydrogel construction.
• To develop advanced materials for flexible strain sensors capable of monitoring human motion.

Main Methods:

• Fabrication of a double network hydrogel using a self-sorting process.
• Incorporation of cationic polyacrylamide as a flexible network and lantern[33]arene-based hydrogen organic framework nanofibers as a rigid network.
• Utilizing kirigami cutting to enhance hydrogel stretchability.

Main Results:

• The hydrogel achieved a conductivity of 0.25 S m-1.
• Demonstrated superior mechanical properties: Young's modulus of 31.9 MPa, fracture elongation of 487%, and toughness of 6.97 MJ m-3.
• Kirigami-processed hydrogel showed significantly improved stretchability for sensor applications.

Conclusions:

• A novel double network hydrogel strategy using lanternarene was successfully developed.
• The developed hydrogel exhibits excellent conductivity and mechanical robustness for flexible electronics.
• This work expands the application of macrocycle hydrogels in wearable strain sensors and flexible electronics.