Highly sensitive, anti-freezing and stretchable hydrogels with modified MXene for multifunctional applications
Xiang-Shu Hu1, Xin Jing1, Jing-Wen Mei1
1Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou 412007, China; National & Local Joint Engineering Research Center for Advanced Packaging Material and Technology, Hunan University of Technology, Zhuzhou 412007, China.
Food Chemistry
|April 2, 2025
Summary
This study introduces a novel, frost-resistant hydrogel for low-temperature sensors. Modified MXene and ethylene glycol (EG) enhance conductivity and prevent freezing, enabling reliable performance in cold environments.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sensor Technology
Background:
- Hydrogels are promising for sensors due to tunable properties but fail at low temperatures.
- High water content leads to freezing, compromising conductivity and mechanical integrity.
- Existing hydrogels have limited applications in cold environments.
Purpose of the Study:
- To develop a novel hydrogel system with enhanced low-temperature performance.
- To improve hydrogel conductivity and frost resistance for sensor applications.
- To demonstrate the hydrogel's utility in detecting human motion and ammonia.
Main Methods:
- Fabrication of a polyacrylamide (PAM) hydrogel with a binary solvent (water/ethylene glycol).
- Incorporation of polyvinyl alcohol (PVA) and modified MXene as conductive filler.
- Evaluation of hydrogel properties including freezing point, conductivity, and sensor performance.
Main Results:
- The hydrogel achieved a freezing point of -36.9 °C with robust frost resistance.
- Modified MXene significantly enhanced conductivity, maintaining performance at low temperatures.
- The hydrogel sensors showed high sensitivity, rapid responsiveness, and accuracy for motion and ammonia detection.
Conclusions:
- MXene-enhanced hydrogels offer exceptional low-temperature stability and functionality.
- The developed hydrogel system is suitable for cold-environment sensor applications.
- Potential applications include raw meat freshness detection and human motion tracking in cold conditions.
