期刊
ACS APPLIED POLYMER MATERIALS
卷 3, 期 4, 页码 1899-1911出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.0c01430
关键词
PDA-Fe; conductive hydrogel; multifunctional; photothermal; sensor
资金
- National Natural Science Foundation of China [51773124, 52073183]
- Sichuan Ministry of Science, Technology Project [2018GZ0322]
This study successfully incorporated polydopamine-Fe nanoparticles into a hydrogel, achieving high elasticity, strength, self-healing property, and electrical conductivity enhancement. These features make it potentially useful in flexible strain sensors for broad applications.
Flexible hydrogel strain sensors have received increased attention due to their potential applications in human-machine interfaces, soft robotics, and electronic skin. However, it still remains a challenge to prepare a multifunctional conductive hydrogel integrating high stretchability, strength, and self-healing property. Here, melanin-inspired polydopamine-Fe (PDA-Fe) nanoparticles were successfully incorporated into the hydrogel, with hydrophobic association serving as dynamic physical cross-linking. The hydrogel exhibited ultrahigh stretchability (1900%) and toughness (1.24 MPa), rapid recovery, self-healing property, photothermal effect, and thermal stability. PDA-Fe enhanced the electrical conductivity of the gel, making it potentially useful for application in flexible strain sensors. The PDA-Fe hydrogel strain sensor showed a broad sensing range (350%), high sensitivity (GF = 3.7), a fast response time, and reliable durability, which could enable detection of large (bending of the finger, elbow, and knee) and subtle (pronunciation) human movements. Therefore, the strategy will shed light on preparation of a multifunctional conductive hydrogel for broad applications.
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