Multiple hydrogen bonds reinforced conductive hydrogels with robust elasticity and ultra-durability as multifunctional ionic skins

Fan

ACS Appl. Mater. Interfaces

et al. 2023

100

Conductive hydrogels are ideal for flexible sensors, but it is still a challenge to produce such hydrogels with combined toughness, selfadhesion, self-healing, anti-freezing, moisturizing, and biocompatibility properties. Herein, inspired by natural skin, a highly stretchable, strainsensitive, and multi-environmental stable collagen-based conductive organohydrogel was constructed by using collagen (Col), acrylic acid, dialdehyde carboxymethyl cellulose, 1,3-propylene glycol, and AlCl 3 . The resulting organohydrogel exhibited excellent tensile (strain >800%), repeatable adhesion (>10 times), self-healing [self-healing efficiency (SHE) ≈ 100%], anti-freezing (−60 °C), moisturizing (>20 d), and biocompatible properties. This organohydrogel also possessed good electrical conductivity (σ = 3.4 S/m) and strain-sensitive properties [GF (gauge factor) = 13.65 with the maximal strain of 400%]. Notably, the organohydrogel had a considerable low-temperature self-healing performance (SHE = 88% at −24 °C) and rapid underwater selfhealing property (SHE = 92%, self-healing time <20 min). This type of strain sensor could not only accurately and continuously monitor the large-scale motions of the human body but also provide an accurate response to the human tiny motions. This work not only proposes a development strategy for a multifunctional conductive organohydrogel with multiple environmental stability but also provides potential research value for the construction of biomimetic electronic skin.

Section: Introductionmentioning

confidence: 99%

Collagen-Based Organohydrogel Strain Sensor with Self-Healing and Adhesive Properties for Detecting Human Motion

Fan

ACS Appl. Mater. Interfaces

et al. 2023

100

“…Since the P(AM 3 -APBA 0.06 )XLG 1.0 /CNTs hydrogel was formed by multiple non-covalent bonds, most of the broken microstructures could reconstruct with enough resting time after the removal of external stress. 51,52 We then evaluated the hysteresis performances of the P(AM 3 -APBA 0.06 )XLG 1.0 /CNTs hydrogel in the tensile study with different strains. It was detected that the residual strain was 5.6%, 7.6%, 8.3%, 9.5%, 10.8%, 12.4%, and 14.7% for the strain of 100%, 200%, 300%, 400%, 500%, 600%, and 700% (Fig.…”

Section: Mechanical Properties Of P(am-apba)xlg/cnts Hydrogelsmentioning

confidence: 99%

Nanocomposite conductive hydrogels with Robust elasticity and multifunctional responsiveness for flexible sensing and wound monitoring

et al. 2023

Self Cite

“…Shen et al [15] reported an advanced hydrogel-based I-skin by free radical polymerization of Nacryloyl phenylalanine (APA) and acrylic acid (AA) in the presence of ferric chloride (FeCl3). APA promotes formation of multiple hydrogen-bonding interactions.…”

Section: Adhesive Hydrogel Sensormentioning

confidence: 99%

Research progress of flexible hydrogel sensor

2023

ACSS

With the advent of the intelligent era, the development of wearable devices has gradually attracted people's attention, and the demand for flexible sensors with the advantages of lightweight and portability has also increased significantly. The flexible sensors prepared by traditional methods have some disadvantages, such as limited ductility, poor durability, insufficient biocompatibility, weak mechanical properties, and complex manufacturing process. Compared with traditional materials, hydrogels have excellent flexibility, extensibility, fracture toughness, conductivity and biocompatibility, making them an ideal choice for flexible wearable sensors. The development of flexible hydrogel sensor is reviewed in this paper.