Skin-like transparent polymer–hydrogel hybrid pressure sensor with pyramid microstructures

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Abstract

Soft biomimetic electronic devices primarily comprise an electronic skin (e-skin) capable of implementing various wearable/implantable applications such as soft human–machine inter-faces, epidermal healthcare systems, and neuroprosthetics owing to its high mechanical flexibility, tissue conformability, and multifunctionality. The conformal contact of the e-skin with living tissues enables more precise analyses of physiological signals, even in the long term, as compared to rigid electronic devices. In this regard, e-skin can be considered as a promising formfactor for developing highly sensitive and transparent pressure sensors. Specifically, to minimize the modulus mismatch at the biotic–abiotic interface, transparent-conductive hydrogels have been used as electrodes with exceptional pressing durability. However, critical issues such as dehydration and low compatibility with elastomers remain a challenge. In this paper, we propose a skin-like transparent polymer– hydrogel hybrid pressure sensor (HPS) with microstructures based on the polyacrylamide/sodium-alginate hydrogel and p-PVDF-HFP-DBP polymer. The encapsulated HPS achieves conformal contact with skin due to its intrinsically stretchable, highly transparent, widely sensitive, and anti-de-hydrative properties. We believe that the HPS is a promising candidate for a robust transparent epidermal stretchable-skin device.

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Kang, K., Jung, H., An, S., Baac, H. W., Shin, M., & Son, D. (2021). Skin-like transparent polymer–hydrogel hybrid pressure sensor with pyramid microstructures. Polymers, 13(19). https://doi.org/10.3390/polym13193272

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