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Biaxially Stretchable Rare Earth-Polymer Multicolor Fluorescent Hydrogel for Human Motion Monitoring and Dynamic
Miaomiao Liu1, Zihan Hao1, Yajuan Li1
1Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, and College of Science, Hebei University of Science and Technology, Yuxiang Road 26, Shijiazhuang, 050080, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|October 22, 2025
Summary
This study introduces a novel lanthanide-coordinated agarose hydrogel with enhanced mechanical strength and rapid response. This smart hydrogel offers dual functions for flexible sensing and dynamic encryption, advancing wearable devices and information security.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Smart hydrogels offer stimulus-responsive properties for diverse applications.
- Limitations in mechanical properties and responsiveness hinder current hydrogel applications.
- Developing adaptable hydrogels with optical responses is a key challenge.
Purpose of the Study:
- To fabricate a smart hydrogel with enhanced mechanical adaptability and optical-response capabilities.
- To investigate the synergistic reinforcement mechanisms within the hydrogel.
- To establish a mechanical-optical synergistic encryption system.
Main Methods:
- One-pot photopolymerization to synthesize lanthanide-coordinated agarose hydrogel (4HBA-PEI-AGA@Ln3+).
- Characterization of mechanical properties (tensile strength, strain) and conductivity.
- Evaluation of response characteristics (GF, response time) and fluorescence stability under strain.
Main Results:
- Achieved high tensile strength (110 kPa) and strain (1530%) with synergistic reinforcement.
- Demonstrated high conductivity (4.34 mS cm-1) and rapid response (100 ms).
- Maintained elasticity and fluorescence stability under biaxial tensile testing (8100% area strain).
Conclusions:
- The developed hydrogel exhibits superior mechanical and responsive properties.
- The hydrogel enables real-time electrical sensing and monitoring of complex movements.
- A novel mechanical-optical synergistic encryption system was established for advanced anti-counterfeiting.
