Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 12, Pages 14625-14635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c03213
Keywords
dual network hydrogel; self-healing; host-guest interaction; dynamic borate ester bonds; biocompatibility; strain sensor
Funding
- National Natural Science Foundation of China [21978180]
- ceshigo
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Hydrogel-based flexible strain sensors have great potential in various applications such as body movement tracking and disease diagnosis. By utilizing dual network hydrogels, researchers have developed composite hydrogels with self-healing, biocompatibility, stretchability, and high sensitivity, which can be used for monitoring human motions and respiratory movements.
Hydrogel-based flexible strain sensors have shown great potential in body movement tracking, early disease diagnosis, noninvasive treatment, electronic skins, and soft robotics. The good self-healing, biocompatible, sensitive and stretchable properties are the focus of hydrogel-based flexible strain sensors. Dual network (DN) hydrogels are hopeful to fabricate self-healing hydrogels with the above properties. Here, multifunctional DN hydrogels are prepared via a combination of host-guest interaction of beta-cyclodextrin and ferrocene with dynamic borate ester bonds of poly(vinyl alcohol) and borax. Carbon nanotubes are used to endow the DN hydrogels with good conductivity. The obtained DN composite hydrogels possess good biocompatibility, stretchability (436%), fracture strength (41.0 KPa), self-healing property (healing efficiency of 95%), and high tensile strain sensitivity (gauge factor of 5.9). The DN composite hydrogels are used as flexible strain sensors to detect different human motions. After cutting, the healed hydrogels also can monitor human motions and have good stability. In addition, the hydrogel sensors may track the respiratory movement of a pig lung in vitro. This work exhibits new ideas and approaches to develop multifunctional self-healing hydrogels for constructing flexible strain sensors.
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