期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 10, 期 20, 页码 6657-6666出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c00463
关键词
injectable conductive hydrogel; photopolymerization; skin-inspired packaging; strain sensor; durability
资金
- National Natural Science Foundation of China [21801157, 51808328]
- Shandong Provincial Natural Science Foundation [ZR2017BB054]
- Innovation Pilot Project of the Integration of Science, Education and Industry of Shandong Province [2020KJCZD06]
- Foundation of the State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences) [ZR20210101, ZR20200101]
Inspired by the delamination structures of skin, researchers have developed a packaged hydrogel strain sensor (PHSS) that combines high sensitivity, linear sensing, good transparency, and conformal adhesion. The PHSS is able to accurately detect human motion and electrophysiological signals. Through the packaging strategy, the sensor's lifespan is increased, and the external hydrogel film allows for reusability.
Flexible hydrogel-based sensors have attracted considerable interest for their potential applications in human motion detection, physiological monitoring, and electronic skin. However, the durability of hydrogel sensors is seriously hindered due to inevitable water evaporation and the lack of reusability. Herein, inspired by the skin's delamination structures that perform sensing and barrier functions, packaged hydrogel strain sensors (PHSSs) were fabricated by employing injectable conductive hydrogel wires as strain sensing elements and another photopolymerizable hydrogel film as an external packaging layer. Thanks to the packaging strategy, multiple properties of the high sensitivity (GF = 1.63 at a strain range of 0-100%), linear sensing property (R-2 > 0.99), good transparency (similar to 85% transmittance), and conformal adhesion (0.24-1.53 kPa) were integrated into one PHSS, which was further demonstrated to possess the capability of detecting human motions and electrophysiological signals precisely. More importantly, the enhanced lifespan (2.5 times) was achieved as a result of water evaporation inhibition by packaging, while the swelling property of the external hydrogel film endowed the PHSS with good reusability (reused for three cycles). This study provides a new strategy for fabricating sustainable hydrogel-based electronics.
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