A bionic tactile plastic hydrogel-based electronic skin constructed by a nerve-like nanonetwork combining stretchable, compliant, and self-healing properties

Pan, Xiaofeng; Wang, Qinhua; He, Pan; Li, Kai; Ni, Yonghao; Chen, Lihui; Ouyang, Xinhua; Huang, Liulian; Wang, Hongping; Xü, Dianguo

doi:10.1016/j.cej.2019.122271

Cited by 191 publications

(100 citation statements)

References 52 publications

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“…Ag/TA/CNC nanocomplexes endow antibacterial, electric conductivity, adhesivity and super stretchability (> 4000 %) [63] PVA/CNF/TA CNF/TA improved mouldability, stretchable (> 2000 %) and endow antibacterial and antioxidant properties [64] PVA/TA-coated CNC TA/CNC endow the toughness & adhesivity [65] PVA/CNF, LN NPs both CNF and LN NPs improved the viscoelastic properties [66,67] PVA/HEC, glycerol, LN both HEC and LN improved stretchability, adhesivity and viscoelastic properties. Fe(III) increased the conductivity and adhesivity [68] GG/glycerol/PC-coated CNF/Fe(III) strain sensor PC/CNF boost mechanical properties and adhesivity while Fe(III) improved conductivity and adhesivity [69] PVA/Glycerol/PC/rGO strain sensor PC/rGO improved mechanical property, conductivity, adhesivity and mimicking the human skin touch feeling feature [70] PVA/CNF-PPy strain sensor CNF/PPy nanocomplex endow high electroconductivity, strength, plasticity, viscoelasticity, and stretchability. [71] PVA/CNF-PAni-…”

Section: Sclgmentioning

confidence: 98%

“…This research groups also incorporated proanthocyanins/reduced graphene oxide (PC/rGO) composite with a nerve-like nano-network to the glycerol/PVA/B hydrogel system to obtain a bionic tactile PC/rGO/PVA hydrogel. [70] The presence of PC/rGO created conductivity in hydrogel along with mimicking the human skin touch feeling feature in the hydrogel. PC was first reduced GO into rGO and the SEM images showed the presence of a coated thin layer of PC on the surface of graphene sheets which formed a nerve-like nanonetwork, similar to pressure sensing systems of human skin.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

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Self‐healing Polyol/Borax Hydrogels: Fabrications, Properties and Applications

Seidi

Jin

Han

et al. 2020

The Chemical Record

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Self-healing polyol/borax hydrogels have found great applications in various areas; especially in sensors, flexible electronics and biomedical fields. In this review, fabrication and characteristics of various types of borax-based hydrogels are discussed. Mechanical properties and self-healing behaviors of these hydrogels are strongly affected by the types of polyol, ratio of polyol:borax, and concentration of each component. Incorporation of highly polar nanofillers (such as cellulose nanofibers) into hydrogels and fabrication of double-network structures have been employed as the promising strategies for improving the mechanical properties. Other additives have also been examined to generate nanocomposite hydrogels for a wide variety of uses; e. g. polyphenols for developing adhesives, conducting polymers, and hybrid structures based on carbon nanotubes and graphenes for electroconductivity, Ag and ZnO nanoparticles for antibacterial property, and quantum dots for fluorescence.

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Section: Sclgmentioning

confidence: 98%

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Self‐healing Polyol/Borax Hydrogels: Fabrications, Properties and Applications

Seidi

Jin

Han

et al. 2020

The Chemical Record

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“…Ion conductive hydrogels consist of a large number of free ions in a 3D polymer network with similar flexibility as biological systems, making them ideal candidates for wearable flexible devices. In recent studies of self-healing ionic conductive hydrogel flexible sensors, conductive ions such as Fe 3+ , [124,125] Na + , [126][127][128][129] [110] glycerol-plasticized polyvinyl alcohol-borax (PVA-borax) / 0.05 [111] polyvinyl alcohol, phenylboronic acid grafted alginate, and polyacrylamide 1.1 × 10 −2 0.064 [112] polyvinyl alcohol and borax / 0.23 [74] Carbon nanotubes polyacrylamide /chitosan hybrid / 0.06 [113] hydrophobic associated polyacrylamide hydrogel / 0.3 [114] Polyacrylamide hydrogels 0.5 0.91 [115] Silver nanoparticles polyion complex/polyaniline hybrid / 3. Al 3+ , [130] ammonium persulfate, [131] sulfuric acid, [132] and lithium chloride [133,134] have been reported.…”

Section: Conductivity Of Hydrogel Flexible Sensormentioning

confidence: 99%

Flexible Self‐Repairing Materials for Wearable Sensing Applications: Elastomers and Hydrogels

Zhou

Dong

et al. 2020

Macromol. Rapid Commun.

100

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related operations, and destroy the operation of the whole equipment (system). Bao and his colleagues developed a novel self-healing and mechanical force-sensing flexible sensor using micro-structured elastomeric dielectrics, which served as a foundation to improve the stability and lifetime of flexible sensors. [8] Self-healing flexible materials can be divided into two categories, one is solvent-less or water-free after curing and high degree of polymerization of elastomers, such as polyamide, polyurethane, etc., the other is hydrogels, low degree of polymerization, structural cross-linking. In self-healing flexible elastomer sensors, the structure of elastomer is mostly linear structure or semi-cross-linked structure; the elastomer of cross-linked structure is poor flexibility and fragile due to its high degree of polymerization. The elasticity of semi-crosslinked structure has excellent resilience and great potential in the field of flexible flexural sensors. In the past two years, self-healing flexible hydrogels have attracted extensive attention due to their excellent stretchability and resilience, as well as outstanding performance in the preparation of sensors with high sensitivity and fast response. [9,10] Sensors with elastomers and hydrogels as flexible matrices face great difficulties in conductivity, which affects the sensitivity and stability of the sensors. Filling conductive materials is the most commonly method, in which organic conductive polymers (polyaniline, [11] polypyrrole [12]) are filled to construct conductive networks, and good interfacial compatibility results in uniform conductive polymer elastomers, but the inherent color fillers affect the transparency of flexible sensors, limiting their applications in the biomedical field. [13-17] Flexible materials filled with inorganic conductive particles (graphene, nano-silver wire) have high conductivity, but phase separation between filler and matrix usually reduces the tensile, toughness and fatigue resistance, and even affects the self-healing ability of flexible materials. Modified fillers are often required to improve affinity for flexible matrices and inhibit phase separation. However, many hydrogel matrices are intrinsically weak and cannot withstand cyclic loadings. [18] Although surface modified fillers can improve strength and toughness, it is difficult to compensate for the inherent weaknesses. For self-healing flexible elastomers, conductive flexible materials can still be endowed with conductivity by scraping or printing conductive particles on the Flexible pressure and strain sensors have great potential for applications in wearable and implantable devices, soft robots, and artificial skin. The introduction of self-healing performance has made a positive contribution to the lifetime and stability of flexible sensors. At present, many self-healing flexible sensors with high sensitivity have been developed to detect the signal of organism activity. The sensitivity, reliability, and stability of self-healing flexible sensors depend...

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“…Flexible electrodes can be fabricated utilizing a variety of different technologies, such as conventional printing technology [ 14 , 15 ], high-resolution lithography patterning [ 16 ], electrostatic flocking technology [ 17 ], and so on. At present, more and more flexible electrodes can measure multiple physiological signals simultaneously [ 18 , 19 , 20 , 21 , 22 ]. Fused sensor information helps the doctor make a more accurate diagnosis [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…The conductive adhesive layer in some flexible dry electrodes, fusing the conductive and adhesive layer, can offer stable skin-electrode contact to decrease motion artifacts [ 25 , 26 ]. Moreover, the plastic hydrogel-based electronic skin fabricated by Xiaofeng Pan et al fused all the three layers and was completely soft and deformable [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Wearable Flexible Dry Electrode Based on Cowhide for ECG Measurement

et al. 2021

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The electrocardiogram (ECG) electrode, as a sensor, is an important part of the wearable ECG monitoring device. Natural leather is rarely used as the electrode substrate. In this paper, wearable flexible silver electrodes based on cowhide were prepared by sputtering and brush-painting. A signal generator, oscilloscope, impedance test instrument, and ECG monitor were used to build the test platform evaluating the performance of electrodes with six subjects. The lossless waveform transmission can be achieved with our electrodes. Therefore, the Pearson’s correlation coefficient calculated with input waveform and output waveform of the electrodes based on the top grain layer (GLE) and the split layer (SLE) of cowhide were 0.997 and 0.998 at 0.1 Hz respectively. The skin electrode impedance (Z) was tested, and the parameters of the equivalent circuit model of the skin electrode interface were calculated by a fitting method, indicating that the Z of the prepared electrodes was comparable with the standard gel electrode when the skin is moist enough. The signal-to-noise ratio of the ECG of the GLE and the SLE were 1.148 and 1.205 times that of the standard electrode in the standing posture, which meant the ECG measured by our electrodes was basically consistent with that measured by the standard electrode.

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A bionic tactile plastic hydrogel-based electronic skin constructed by a nerve-like nanonetwork combining stretchable, compliant, and self-healing properties

Cited by 191 publications

References 52 publications

Self‐healing Polyol/Borax Hydrogels: Fabrications, Properties and Applications

Self‐healing Polyol/Borax Hydrogels: Fabrications, Properties and Applications

Flexible Self‐Repairing Materials for Wearable Sensing Applications: Elastomers and Hydrogels

A Novel Wearable Flexible Dry Electrode Based on Cowhide for ECG Measurement

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