Recent progress in conductive self‐healing hydrogels for flexible sensors

Tao, Qin; Liao, Wenyu; Yu, Li; Zhu, Junhui; Wu, Meng; Peng, Qiyu; Han, Linbo; Zeng, Hongbo

doi:10.1002/pol.20210899

Cited by 52 publications

(27 citation statements)

References 140 publications

(222 reference statements)

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“…The self-healing performance of hydrogels is also a focus of researchers [ 79 – 81 ]. In the current research, most self-healing hydrogels have been able to meet the needs of wearable devices.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide composite hydrogels for wearable devices

2022

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For graphene oxide (GO) composite hydrogels, a two-dimensional GO material is introduced into them, whose special structure is used to improve their properties. GO contains abundant oxygen-containing functional groups, which can improve the mechanical properties of hydrogels and support the application needs. Especially, the unique-conjugated structure of GO can endow or enhance the stimulation response of hydrogels. Therefore, GO composite hydrogels have a great potential in the field of wearable devices. We referred to the works published in recent years, and reviewed from these aspects: (a) structure of GO; (b) factors affecting the mechanical properties of the composite hydrogel, including hydrogen bond, ionic bond, coordination bond and physical crosslinking; (c) stimuli and signals; (d) challenges. Finally, we summarized the research progress of GO composite hydrogels in the field of wearable devices, and put forward some prospects.

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Section: Introductionmentioning

confidence: 99%

Graphene oxide composite hydrogels for wearable devices

2022

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“…Conductive hydrogels that transport either electrons or ions have great promise to serve as soft bioelectrodes to mimic bioelectric signal transport or electrically bridge electronic devices and biotissues. 4,5 Interface interactions are needed to provide robust device−tissue adhesion. 1,3 This is particularly significant for implants in dynamic organs like stomach, heart, and lung.…”

Section: Introductionmentioning

confidence: 99%

“…Most hydrogels are soft, stretchable, and biocompatible and allow accommodation of flexible electronics in or on the surface of biotissues. Conductive hydrogels that transport either electrons or ions have great promise to serve as soft bioelectrodes to mimic bioelectric signal transport or electrically bridge electronic devices and biotissues. , Interface interactions are needed to provide robust device–tissue adhesion. , This is particularly significant for implants in dynamic organs like stomach, heart, and lung. Moreover, strong adhesion also reduces interface impedance for bioelectrodes to collect bioelectrical signals or to provide electrical stimulation to the brain or neurons.…”

Section: Introductionmentioning

confidence: 99%

Hydrogel–Tissue Interface Interactions for Implantable Flexible Bioelectronics

Cong

2022

Langmuir

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Hydrogels have emerged as multifunctional interface materials between implantable bioelectronic devices and biotissues. The soft and wet materials with low and alterable mechanical properties can match the mechanical, chemical, electrical, and biological properties of biotissues and thus diminish the mechanical and electrical mismatch. Interactions at the hydrogel−biotissue and hydrogel−device interfaces have attracted broad research interest. Great efforts have been devoted to establishing instant, strong, and conformal adhesion at the interface by chemical bonding, electrostatic interaction, hydrogen bonding, supramolecular recognition, hydrophobic association, and even topological entanglements at the interfaces. This Perspective provides a brief account of representative progress on the hydrogel−tissue adhesive that forms seamless and conformal interface adhesion and applications in implantable devices for physiological, cardiac, and neuronal signal collection and electrical stimulation. Major challenges such as wet adhesion and the stability of the adhesive hydrogel−tissue interface are identified for examination in future investigations.

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“…Due to the excellent biocompatibility and flexibility, conductive hydrogels have aroused extensive attention in wearable sensors, [1][2][3][4][5][6] electronic skins, 7,8 energy storage devices, 9,10 and so forth. As the high water content makes the hydrogels easy to freeze at low temperature, their mechanical and conductive performance will thus be seriously affected.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐stretchable, anti‐freezing conductive hydrogels crosslinked by strong hydrogen bonding for flexible sensors

Yu-rong

et al. 2022

Journal of Polymer Science

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Conductive hydrogel has shown unparalleled potential in flexible electronics. However, water-based hydrogels will inevitably face deteriorated mechanical strength and ionic transport ability in low temperature, which may severely hinder their wide-range application. To address the problem, we herein introduced a natural zwitterionic osmolyte (proline) and ammonium chloride (NH 4 Cl) as the anti-freezing agent into a physically cross-linked polyvinylpyrrolidone (PVP)/polyacrylamide (PAAm) hydrogel (PA gel), as inspired by the nature-gifted anti-freezing ability. The resulting conductive hydrogel demonstrated high stretchability (up to 3305%), and excellent ion-conductivity (up to 11.8 S/m) and could withstand a low temperature (À40 C). Moreover, the gelbased sensor showed sensitive dynamic response to different tensile rates and tensile strain. It is expected that the plant-inspired anti-freezing hydrogel will provide more possibilities for the application in flexible sensors.

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Recent progress in conductive self‐healing hydrogels for flexible sensors

Cited by 52 publications

References 140 publications

Graphene oxide composite hydrogels for wearable devices

Graphene oxide composite hydrogels for wearable devices

Hydrogel–Tissue Interface Interactions for Implantable Flexible Bioelectronics

Ultra‐stretchable, anti‐freezing conductive hydrogels crosslinked by strong hydrogen bonding for flexible sensors

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