Self-Healing and Antifreezing/Antidrying Conductive Eutectohydrogel-Based Biosignal Monitoring Multisensors with...

Area of Science:

• Materials Science
• Polymer Chemistry
• Wearable Electronics

Background:

• Wearable electronic devices require advanced materials with enhanced durability and functionality.
• Existing materials often lack self-healing, antifreezing, and antidrying capabilities, limiting their application range.
• Conductive hydrogels are promising for wearable applications but face challenges in stability and longevity.

Purpose of the Study:

• To develop a novel self-healing, antifreezing, and antidrying conductive eutectohydrogel.
• To investigate the material's mechanical properties and electrochemical performance.
• To demonstrate the potential of this eutectohydrogel in wearable multifunctional sensors and supercapacitors.

Main Methods:

• Incorporation of trehalose and phytic acid into a polyacrylamide network to create reversible cross-linkers.
• Utilizing a deep eutectic solvent combined with water to achieve air stability and antifreezing/antidrying characteristics.
• Fabrication of self-healing strain sensors, temperature sensors, electrocardiogram electrodes, and supercapacitors using the synthesized eutectohydrogel.

Main Results:

• The eutectohydrogel achieved a self-healing efficiency of 90.7% and exhibited tunable mechanical properties (Young's modulus: 140.9 kPa, strain at break: 352.8%).
• Devices fabricated with the hydrogel demonstrated stable performance over a wide temperature range (-20 to 50 °C) and recovered functionality after self-healing.
• A vertically integrated patch device successfully detected body movements using stored energy, even after complete bisection and self-healing.

Conclusions:

• The novel conductive eutectohydrogel offers a versatile platform for durable and long-lasting wearable electronic devices.
• The material's unique combination of self-healing, antifreezing, and antidrying properties addresses key limitations in current wearable technology.
• This research highlights significant potential for advanced hydrogels in next-generation flexible wearable sensors and energy storage devices.