Self-healing, anti-freezing, adhesive and remoldable hydrogel sensor with ion-liquid metal dual conductivity for biomimetic skin

Flexible wearable sensors assembled from conductive hydrogels have received great attention due to their wide application in human-machine interfaces, medical and healthcare detection. However, the traditional conductive gel needs to be attached to the application surface with external force, and on...

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Veröffentlicht in:Composites science and technology Jg. 203; S. 108608
Hauptverfasser: Zhou, Zixuan, Qian, Chunhua, Yuan, Weizhong
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Barking Elsevier Ltd 08.02.2021
Elsevier BV
Schlagworte:
Biomimetics
Compressive strength
Conductivity
Electrical resistivity
Electronic devices
Fatigue strength
Freeze thaw cycles
Gallium
Human motion
Hydrogels
Liquid metals
Man-machine interfaces
Mechanical properties
Medical diagnosis
Multifunctional composites
Multifunctional properties
Polymers
Polyvinyl alcohol
Self-healing
Sensitivity
Sensors
Service life
Smart materials
Strain gauges
Tannic acid
Voice recognition
Wearable computers
Wearable technology
Self-healing
Multifunctional properties
Multifunctional composites
Polymers
Smart materials
ISSN:0266-3538, 1879-1050
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Zusammenfassung:Flexible wearable sensors assembled from conductive hydrogels have received great attention due to their wide application in human-machine interfaces, medical and healthcare detection. However, the traditional conductive gel needs to be attached to the application surface with external force, and only respond to the single strain stimulus. Moreover, due to the existence of water, ordinary hydrogels cannot work at below zero temperatures, which severely limits the application of hydrogel-based flexible electronic devices. The flexible wearable epidermal sensors assembled by ultra-sensitive polyvinyl alcohol-tannic acid-eutectic gallium-indium (PVA-TA-EGaIn) hydrogels with adhesiveness, rapid self-healing, high electrical conductivity and mechanical properties, and temperature sensitivity. The rigid conductive hydrogel prepared by freeze-thaw cycles shows outstanding tensile/compressive strength (1.13 MPa/4.59 MPa) and toughness (1.9 MJ/m3), and reveals excellent fatigue resistance. It also exhibited high conductivity (3.63 S m−1) and strain sensitivity (gauge factor = 2.59). In addition, the hydrogels maintained good flexibility and conductivity at −10 °C. Besides, the PVA-TA-EGaIn hydrogels shows remoldability, which greatly prolongs the service life of the gel. The composite hydrogels show the potential of building the next generation of multifunctional hydrogel-based flexible wearable sensors in human motion monitoring, voice recognition and medical diagnosis. [Display omitted] •The high conductivity of the hydrogel was supplied by NaCl and EGnIn.•The hydrogel displayed outstanding self-healing and anti-freezing performance.•The hydrogel was endowed with self-adhesiveness and remoldability.•The flexible multifunctional sensors could be used as smart biomimetic skin.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2020.108608