Issue 46, 2023

A robust conductive organohydrogel with adhesive and low-hysteresis properties for all-weather human motion and wireless electrocardiogram sensing

Abstract

Traditional conductive hydrogels often have problems, such as a limitation of the operating temperature, low adhesion and sensitivity, and unsatisfactory durability, which seriously hinder the development of conductive hydrogel sensors for practical all-weather applications. In this work, we proposed a novel multifunctional ionic conductive organohydrogel: PAM-Gly-LiCl-TA (OH-PLT). The OH-PLT hydrogel is based on a PAM polymer network containing glycerol/water with certain additives, including tannic acid and LiCl. The OH-PLT hydrogel demonstrated good mechanical properties with a strain at break of 560%, maximum breaking strength of 78 kPa, and low hysteresis of ∼10%. Meanwhile, this organohydrogel exhibited an excellent electrical conductivity (1.04 S m−1) and a highest sensitivity at 150% strain (GF = 7.54). Further, OH-PLT showed a wide working window (−30 °C to 40 °C) and long-term moisture retention (>7 days) under a room environment. Moreover, it possessed strong UV resistance (98.7%) and a high level of transparency (>80%). Finally, the developed hydrogel sensor could directly adhere to skin for human motion monitoring in all weather conditions and wirelessly monitor ECG signals in performing activities. This work provides a robust and feasible organohydrogel with a strong environmental adaptability, which indicates it could be a great potential candidate for flexible sensor applications.

Graphical abstract: A robust conductive organohydrogel with adhesive and low-hysteresis properties for all-weather human motion and wireless electrocardiogram sensing

Supplementary files

Article information

Article type
Paper
Submitted
08 Oct 2023
Accepted
04 Nov 2023
First published
07 Nov 2023

J. Mater. Chem. C, 2023,11, 16135-16142

A robust conductive organohydrogel with adhesive and low-hysteresis properties for all-weather human motion and wireless electrocardiogram sensing

Y. Zhao, Q. Zhao, S. Peng, H. Zhou and L. Yang, J. Mater. Chem. C, 2023, 11, 16135 DOI: 10.1039/D3TC03651K

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