Cited by 349Advanced Sensor and Energy Harvesting MaterialsHydrogels: synthesis, properties, applicationsAdvanced Materials and Mechanics

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A flexible, adhesive and self-healable hydrogel-based wearable strain sensor for human motion and physiological signal monitoring

Xia, Shan, Song, Shixin, Jia, Fei, Gao, Guanghui·2019·Journal of Materials Chemistry B

DOI 10.1039/c9tb01039d

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Abstract

The advent of hydrogel-based strain sensors has attracted immense research interest in artificial intelligence, wearable devices, and health-monitoring systems. However, the integration of the synergistic characteristics of good mechanical properties, self-adhesiveness, self-healing capability and high strain sensitivity for fabricating hydrogel-based strain sensors is still a challenge. Here, a multifunctional conductive hydrogel composed of a polyacrylamide (PAAm)/chitosan (CS) hybrid network is fabricated for wearable strain sensors. The PAAm network is cross-linked by hydrophobic associations, and the CS network is ionically cross-linked by carboxyl-functionalized multi-walled carbon nanotubes (c-MWCNTs). These two networks are further interlocked by physical entanglement and hydrogen bond interactions. The obtained hydrogels exhibit excellent flexibility, puncture resistance and self-healing capability because of the efficient energy dissipation of the dynamic cross-linking network. Moreover, the hydrogels exhibit self-adhesive behavior on various materials, including polytetrafluoroethylene, wood, glass, aluminum, rubber and skin. Notably, the hydrogels can be applied as soft human-motion sensors for real-time and accurate detection of both large-scale and small human activities, including joint motions, speaking, breathing, and even subtle blood pulsation. Therefore, it is anticipated that the flexible, self-adhesive, self-healing and conductive hydrogel-based strain sensor will have promising applications in artificial intelligence, soft robots, biomimetic prostheses, and personal health care.

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Authors: Xia, S., Song, S., Jia, F., & Gao, G.
Affiliations: Advanced Institute of Materials Science (JP)
Corresponding author: Jia, Fei
Gao, Guanghui
ORCID: Xia, Shan
Song, Shixin
Jia, Fei
Gao, Guanghui
Venue: Journal of Materials Chemistry B
Publisher: Royal Society of Chemistry (RSC)
Published: 2019
Volume: 7
Issue: 30
Pages: 4638-4648
ISSN: 2050-750X (ISSN-L)
2050-7518
DOI: 10.1039/c9tb01039d
OpenAlex: W2955424780
Cited by: 349
References: 40
Citations by year: 2026: 30 · 2025: 47 · 2024: 62 · 2023: 59 · 2022: 57 · 2021: 52 · 2020: 37 · 2019: 5
FWCI: 13.29
Type: journal article
Language: en
Open access: closed
Licence: rsc.li/journals-terms-of-use (am, 541 d)
Locations: Journal of Materials Chemistry B (publishedVersion)
PubMed (publishedVersion)
Funders: National Natural Science Foundation of China (51703012, 51873024)
Department of Science and Technology of Jilin Province (20180101207JC, 20180201021G)
Topics: Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
Physical Sciences › Materials Science › Biomaterials › Hydrogels: synthesis, properties, applications
Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
Keywords: conductive hydrogels, wearable strain sensors, self-healing hydrogels, self-adhesion, polyacrylamide, chitosan, multi-walled carbon nanotubes, hydrophobic association, human motion monitoring, physiological monitoring, soft robotics
MeSH terms: Wearable Electronic Devices, Polyacrylamides, Acrylic Resins, Humans, Hydrogen Bonding, Monitoring, Physiologic, Motion, Sprains and Strains, Hydrogels, Chitosan

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A flexible, adhesive and self-healable hydrogel-based wearable strain sensor for human motion and physiological signal monitoring

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