A flexible hydrogel tactile sensor with low compressive modulus and dynamic piezoresistive response regulated by lignocellulose/graphene aerogels

Zhou, Hang; Zheng, Li; Meng, Qingyu; Tang, Ruixin; Wang, Zhaosong; Dang, Baokang; Shen, Xiaoping; Zhang, Jiayi

doi:10.1039/d1tc02762j

Cited by 14 publications

(14 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tensile and compressive moduli determined at different strains are shown to be low (10 4 Pa) for all hybrid hydrogels (Figure f), i.e. , a small stress can lead to a large deformation and, thus, electrical signal change, which is beneficial to usages in wearable devices for highly sensitive subtle pressure responsiveness. ,, …”

Section: Resultsmentioning

confidence: 99%

“…The tensile and compressive moduli determined at different strains are shown to be low (10 4 Pa) for all hybrid hydrogels (Figure 3f), i.e., a small stress can lead to a large deformation and, thus, electrical signal change, which is beneficial to usages in wearable devices for highly sensitive subtle pressure responsiveness. 4,13,25 Sensing Capacity Evaluation. Considering the high conductivity of the ternary hybrid hydrogels (with LM contents over the 0.3 wt % threshold), two sensing assembly configuration models, piezoresistive and capacitive patterns, were designed and compared.…”

Section: Synergistic Stabilization Effect During Preparationmentioning

confidence: 99%

“…Flexible pressure sensors have been implemented in robotics, wearable health-monitoring devices, , and various human–machine interfaces by detecting ambient changes of applied stress or strain. Generally, four types of configurations including piezoresistive, capacitive, mechanochromic, and triboelectric devices have been applied to fabricate tactile sensing units, the array of which further achieves real-time large-area sensing .…”

Section: Introductionmentioning

confidence: 99%

“…For, example, fully physically linked agar/poly( N -hydroxyethyl acrylamide) double-network hydrogels with super bulk toughness (0.18–1.62 MJ m –3 ), elastic modulus (0.3–2.4 MPa), and interfacial toughness (5200 J m –2 ) could be generated via a simple heating–cooling photopolymerization method for strong adhesion . Quite differently, for hydrogels applied as tactile or deformation sensors, immediate toughness recovery (without resting) and low Young’s modulus (easy deformation) are much more significant to achieve competitive responsive repeatability and sensitivity. ,, …”

Section: Introductionmentioning

confidence: 99%

“…24 Quite differently, for hydrogels applied as tactile or deformation sensors, immediate toughness recovery (without resting) and low Young's modulus (easy deformation) are much more significant to achieve competitive responsive repeatability and sensitivity. 4,13,25 To enhance the conductivity of hydrogels, the strategy of embedding conductive fillers in the hydrogel network is the most used. However, traditional conductive nanofillers such as silver nanowires 26 and graphene nanosheets 27 suffer from a few latent deficiencies caused by their intrinsic nature like rigidity, difficulty in dispersion, too deep color, etc.…”

Section: ■ Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Multifunctional Ternary Hybrid Hydrogel Sensor Prepared via the Synergistic Stabilization Effect

Tang

Meng

Wang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Since highly stretchable hydrogels have demonstrated their promising applications in flexible tactile sensors and wearable devices, the current challenge has been imposed on stretchable and multifunctional electronics. Here, we report a multifunctional sensor composed of a liquid metal (LM) nanodroplet-adhered self-assembled polymeric network, anionic carboxymethylcellulose (CMC), and cationic polyacrylamide (PAAm). The synergistic effect, zeta potential reduction, by CMC and macromolecules enveloped by LM contributes to the stabilization of the ternary system during preparation and, thus, the homogenization of the products. By engineering and optimizing the ternary hybrid hydrogels, excellent extensibility (tensile strain near 300%), readily reversible hysteresis loops, and accessible deformability (low modulus of 104 Pa) are afforded. The fabricated sensor exhibits a high tensile strain gauge factor of around 0.7 and a high compressive stress sensitivity of up to 0.12 kPa–1, a fast response time below 125 ms, and a high stability and precision in usage. In a series of practical scenarios, the assembled sensor displays distinguished abilities to monitor bodily motions, record electrocardiograms, authenticate handwriting, discern temperature, and infer materials, making them highly promising for multifunctional intelligent soft sensing.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Synergistic Stabilization Effect During Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multifunctional Ternary Hybrid Hydrogel Sensor Prepared via the Synergistic Stabilization Effect

Tang

Meng

Wang

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

Cellulose Gel Mechanoreceptors – Principles, Applications and Prospects

Shen

Zhao

Xie

et al. 2023

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

In order to effectively harness varieties of mechanical waves or vibrations for the purpose of monitoring and/or powering, developments in responsive materials and conversion technologies are taking place driven by the world's current and future demands. One of the most popular novelties of the last two decades is represented by hydrogel-or ionogel-based flexible iontronics which constitute a wide family of innovative smart (self-powered) mechanoreceptors relevant for various applications such as personal health care, identity and safety monitoring, intelligent human-machine operation interfaces, underwater listening and communication, and so on. Cellulosic gels (CGs), as a promising green substitute for fossil fuel-derived materials, are extensively studied due to the possibility to choose between different cellulose types and to formulate networks chemically or physically, according to the adaptability requirements for each target application. The aim of this review is to showcase the cellulose structural versatility and to provide a summary of the principles during the formulation of CGs used for mechanosensing and mechanical energy scavenging, as well as their practical applications. Such an outlook of current challenges and overall prospects will serve as a stimulus for research on CG-based mechanoreceptors in the future.

show abstract

Elastomeric polymers for conductive layers of flexible sensors: Materials, fabrication, performance, and applications

Huang

Peng

et al. 2023

Aggregate

View full text Add to dashboard Cite

In the wave of the Internet era created by computer and communication technology, flexible sensors play an important role in accurately collecting information owing to their excellent flexibility, ductility, freeform bending or folding, and versatile structural shapes. By endowing elastomeric polymers with conductivity, researchers have recently devoted extensive efforts toward developing high‐performance flexible sensors based on elastomeric conductive layers and exploring their potential applications in diverse fields ranging from project manufacturing to daily life. This review reports the recent advancements in elastomeric polymers used to make conductive layers, as well as the relationships between elastomeric polymers and the performance and application of flexible sensors are comprehensively summarized. First, the principles and methods for using elastomeric polymers to construct conductive layers are provided. Then, the fundamental design, unique properties, and underlying mechanisms in different flexible sensors (pressure/strain, temperature, humidity) and their related applications are revealed. Finally, this review concludes with a perspective on the challenges and future directions of high‐performance flexible sensors.

show abstract

A flexible hydrogel tactile sensor with low compressive modulus and dynamic piezoresistive response regulated by lignocellulose/graphene aerogels

Abstract: Elastic polyion hydrogels (EPIH) as pressure sensors require to be microstructurally modified or micropatterned to improve the sensitivity of the parallel-plate sensing conﬁgurations. In this work, we designed a novel...

Cited by 14 publications

References 32 publications

Multifunctional Ternary Hybrid Hydrogel Sensor Prepared via the Synergistic Stabilization Effect

Multifunctional Ternary Hybrid Hydrogel Sensor Prepared via the Synergistic Stabilization Effect

Cellulose Gel Mechanoreceptors – Principles, Applications and Prospects

Elastomeric polymers for conductive layers of flexible sensors: Materials, fabrication, performance, and applications

Contact Info

Product

Resources

About