A Highly Tough and Strain-Sensitive MXene Hydrogel Sensor Enabling Integrated Wearable Electronics with Body...

Area of Science:

• Materials Science
• Wearable Electronics
• Sensor Technology

Background:

• MXene hydrogel sensors offer flexibility and stimuli sensitivity for wearable electronics.
• Existing MXene sensors suffer from aggregation and oxidation, compromising performance.

Purpose of the Study:

• To develop robust MXene hydrogel sensors with improved mechanical properties and long-term stability.
• To enhance strain sensitivity and conductivity for advanced wearable applications.

Main Methods:

• In situ polymerization and non-covalent interactions were employed to create the hydrogel matrix.
• Dopamine-grafted carboxymethyl cellulose sodium (DA@CMC) was introduced to improve anti-oxidation and adhesion.

Main Results:

• The developed hydrogel sensors achieved 1100% stretchability and 5374 J m^-2 fracture energy.
• Sensors demonstrated a fast response time (102 ms) and wide sensing scope (0-800% strain) with excellent anti-oxidation and conductivity.
• System-level integration with a multicolor display enabled real-time visual motion monitoring.

Conclusions:

• This work presents a novel approach to creating highly stretchable and tough MXene hydrogel sensors.
• The enhanced sensors show significant potential for body-conformable wearable electronics with visual functionalities.