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Highly Stretchable, Fast Self-Healing, Self-Adhesive, and Strain-Sensitive Wearable Sensor Based on Ionic Conductive
Ruirui Li1, Jie Ren1, Minmin Zhang1
1Chemistry & Chemical Engineering College, Key Lab of Polymer Materials of Ministry of Education of Ecological Environment, Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Northwest Normal University, Lanzhou 730070, PR China.
This study presents a new conductive hydrogel with excellent stretchability, self-healing, and transparency for wearable human-motion sensors. The material demonstrates high sensitivity and durability for real-time monitoring of various body movements.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Conductive hydrogels are ideal for wearable human-motion sensors due to their skin-like properties.
- Achieving multiple functionalities like stretchability, toughness, and self-healing in a simple manner remains a challenge.
Purpose of the Study:
- To develop a multifunctional conductive hydrogel with enhanced properties for wearable strain sensors.
- To explore the synergistic effects of various components for improved performance.
Main Methods:
- A two-step method was employed using chitosan (CS), oxidized hyaluronic acid (OHA), hydroxypropyl methylcellulose (HPMC), poly(acrylic acid) (PAA), tannic acid (TA), and Al3+.
- Dynamic imine bonds, metal coordination bonds, and hydrogen bonds were utilized to form the hydrogel network.
Main Results:
- The hydrogel exhibited excellent tensile properties (3168% elongation), toughness (0.79 MJ/m3), and rapid self-healing (95.5% in 30 min).
- It demonstrated high transparency (98.5%), good adhesion, and excellent sensing performance (GF=4.12, low detection limit, fast response/recovery).
- The hydrogel successfully monitored human movements when used in wearable sensors.
Conclusions:
- The developed CS/OHA/HPMC/PAA/TA/Al3+ hydrogel offers a promising platform for advanced wearable strain sensors.
- Its combination of conductivity, mechanical properties, and biocompatibility opens avenues for diverse biomedical applications.
