Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 10, Pages 12531-12540Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00819
Keywords
dual network hydrogel; topological entanglement; low hysteresis; epidemic sensor; self-adhesive
Funding
- Key Project of Guangzhou Science and Technology Plan Project [201904020034]
- National Natural Science Foundation of China [52073099]
- China Postdoctoral Science Foundation [2020M682701]
- Fundamental Research Funds for the Central Universities, SCUT [2019MS139]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011148]
- Guangdong Project of R&D Plan in Key Areas [2020B010180001]
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The PAa hydrogel exhibits low modulus, excellent stretchability, high compression, rapid recovery, and self-adhesion, making it promising for applications in epidemic electronics.
Dual-network conductive hydrogels have drawn wide attention in epidemic electronics such as epidemic sensors and electrodes because of their inherent low Young's modulus, high skin-compliance, and tunable mechanical strength. However, it is still full of challenges to gain a dual-network hydrogel with high stretchability, low hysteresis, and skin-adhesive performance simultaneously. Herein, to address this issue, a novel dual-network hydrogel (denoted as PAa hydrogel) with polyacrylamide as the first network and topologically entangled polydopamine as the secondary network was prepared through a facile gel-phase in situ self-polymerization and soaking treatment. Benefiting from the topological enhancement as well as the synergetic effects of hydrogen bonds and metal coordination bonds, low modulus (similar to 10 kPa), excellent stretchability (1090.8%), high compression (90%), negligible hysteresis (eta = 0.019, energy loss coefficient), rapid recovery in seconds, and self-adhesion are obtained in the PAa hydrogels. To demonstrate their practical use, a states-independent and skin-adhesive epidemic sensor was successfully attached on human skin for motion detection. What is more, by using the hydrogel as an epidemic electrode, electromyogram signals were accurately detected and wirelessly transmitted to a smart phone. This work offers a new insight to understand the strengthening mechanism of dual network hydrogels and a design strategy for both epidemic sensors and electrodes.
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