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摘要
Hydrogel sensors have succeeded in achieving a seamless connection between biology and electronics, but these materials are often plagued by problems such as poor mechanical properties and the need for external power or batteries. In this article, we use polyvinyl alcohol (PVA), acrylonitrile (AN), sodium p-styrene sulfonate (NaSS), acrylamide (AAm) as raw materials, N,N′ -methylene bisacrylamide (MBA) as a crosslinker to prepare a polyacrylonitrile-based self-powered hydrogel (PVA-PAN). Its performance was characterized by infrared spectrum, mechanical property test and mechanical-electric response performance test. The results showed that the dipole interaction between the PAN chains and the hydrogen bond between PVA and PAN segments promoted the PAN to the planar zigzag conformation, and the maximum piezoelectric coefficient d33 was 32 p/CN. It has a similar young’s modulus value to skin (0.08–5.49 MPa) and good stretchability (97%–408%). Due to the stress-induced polarization effect, the self-powered hydrogel can generate an electrical output of about 60 mV. The V-T curve shows that the hydrogel can accurately detect various human activities (such as joint movement, and step frequency) through the change of voltage signal. In this study, the hydrogel sensor has the advantages of easy preparation, low cost, high elasticity and self-power, which provides theoretical guidance for its application in artificial skin, human health detection, medical diagnosis and other fields. ? 2022 The authors.
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