Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 4, Issue 11, Pages 5199-5207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.2c00867
Keywords
ionic hydrogel; graphene; 3D printing technique; wearable device; human-machine interface
Funding
- Key-Area Research and Development Program of Guangdong Province [2020B090923003]
- Civil Aerospace Technology Research Project [B0108]
- Experiments for Space Exploration Program
- Qian Xuesen Laboratory, China Academy of Space Technology [TKTSPY-2020-01-04]
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This study introduces a stretchable, highly conductive, and self-adhesive ionic hydrogel fabricated with an LCD light-curing 3D printing technique. The hydrogel exhibits outstanding electrical conductivity, excellent stretchability, and strong adhesion performance. It can be used in the manufacturing of flexible wearable devices and monitoring human movements and physiological signals.
Ionic hydrogels are conductive and stretchable, showing great potential for applications in flexible wearable devices. However, poor mechanical and electrical properties, low manufacturing precision, and lack of self-adhesion severely limit their practical applications in hydrogel wearable devices. Herein, we propose a stretchable, highly conductive, and self-adhesive ionic hydrogel fabricated with an LCD light-curing 3D printing technique. 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), 4-hydroxybutyl acrylate (HBA), and graphene are incorporated to prepare the printable ion-conductive hydrogel. The results show that this hydrogel exhibits outstanding electrical conductivity (0.0487 S/cm), excellent linear sensitivity (GF = 1.86 within 100% strain), amazing stretchability (1200% strain), and strong adhesion performance with various materials. Furthermore, the HBA-AMPS-graphene (HAG) hydrogel-based flexible wearable devices can monitor various human movements from tiny scale (breathing and speaking) to large scale (such as elbow and knee joint movement). Most significantly, the hydrogel wearable devices can capture the signals of pulse beating and breathing, which are so light that they are hard to be monitored. Our printable ionized hydrogel wearable devices promise applications in motion monitoring, health detection, human-machine interface, and so on.
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