A low-modulus, adhesive, and highly transparent hydrogel for multi-use flexible wearable sensors

Yu, Dongyang; Teng, Yanhua; Zhou, Ninghong; Xu, Yiting; Wang, Xiaobei; Lin, Xiuling; Wang, Qingping; Xue, Chunlai

doi:10.1016/j.colsurfa.2022.130752

Cited by 16 publications

(5 citation statements)

References 50 publications

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“…As shown in Figure d,e, similar signals were detected when the volunteer said words and swallowed regularly, which showed that the highly sensitive sensor could also detect small pressure response signals. In addition, the response time, sensitivity, and detecting range of DHP were compared with other reported literature studies − as shown in Figure f, which showed that DHP exhibited an excellent all-around performance with rapid response time, high sensitivity and a broad detecting range. The above data indicated that through a new preparation method based on the ion gradient induced by the electrostatic field, an integrated capacitor sensor with a sandwich-like structure had been produced.…”

Section: Resultsmentioning

confidence: 94%

“…Wearable sensing performance of DHP sensor. Real-time capacitance signals recorded in detecting (a) different bend–release finger motions, (b) objects of different modulus, (c) wrist pulse, (d) speaking, (e) swallowing, (f) response time, sensitivity, and pressure range of DHP with other reported sensors, 1 (ref ), 2 (ref ), 3 (ref ), 4 (ref ), 5 (ref ), 6 (ref ), 7 (ref ).…”

Section: Resultsmentioning

confidence: 99%

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An Integrated Capacitive Pressure Sensor Based on Gradient Charge Distribution with High Sensitivity and Fast Response

Zhou,

Xu,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Hydrogel-based electronic skin (E-skin) has attracted great research interest because of their promising applications in skin-attachable devices for health monitoring, prosthetics, and robotics. However, the design and fabrication of hydrogel-based E-skin devices with desirable mechanical properties, alongside simultaneous high sensitivity and a broad detection range, remains a significant challenge. In this study, we successfully synthesize an integrated capacitive sensor based on a gradient charge distribution hydrogel with a sandwich-like structure (cation-rich layer, dielectric layer, and anion-rich layer). This synthesis is accomplished via a process entailing the migration of ions in solution under a high-voltage electrostatic field, followed by UV curing. Fluorescent nanospheres are utilized to mimic ion motion, as indicated by the alterations in fluorescence intensity and micromorphology observed on both sides of the hydrogel. The capacitive sensor exhibits impressive mechanical performance, with a compressive strength of 987 kPa at 70% compression strain. Besides, owing to the electrical double layer (EDL) constructed by the ion gradient and the nanospine structure fabricated on the hydrogel surface, the sensor achieves both high sensitivity (increased by more than 20 times) and wide detection range at the same time. Moreover, the flexible sensors demonstrate fast response time (31 ms), allowing for immediate detection of both subtle and robust physiological activities. This strategy provides a convenient method to fabricate gradient-ion hydrogels and develops the applications in monitoring subtle vital signals and human movements.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

An Integrated Capacitive Pressure Sensor Based on Gradient Charge Distribution with High Sensitivity and Fast Response

Zhou,

Xu,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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show abstract

“…1c. It is evident that, in comparison to other materials with low modulus, high conductivity, and adhesion, [48][49][50][51][52][53][54] our SCCF has maintained a high level across the three dimensions.…”

Section: Resultsmentioning

confidence: 95%

An ultra-soft conductive elastomer for multifunctional tactile sensors with high range and sensitivity

Yin,

Chen,

Yin

et al. 2024

Mater. Horiz.

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“…As reported in the literature, 38 the response time of hydrogel-based sensors was obtained via applying transient strains. In practical operation, the strain sensor was connected to a Keithley 2450 source meter to collect the current response under various deformations at an applied voltage of 1.0 V. The time interval for responding to a sudden loading/releasing of pressure on the sensor was expressed as the response time.…”

Section: Mechanical and Adhesive Performancementioning

confidence: 99%

Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

Yue,

Zhai,

Zhang

et al. 2024

ACS Appl. Electron. Mater.

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Herein, a poly(N-isopropylacrylamide)-based conductive composite hydrogel system coenhanced by clay and polydopamine-modified MXene was synthesized to achieve strain and temperature sensibility simultaneously. The noncovalently cross-linked network via MXene, clay, and polymer chains endowed the synthesized hydrogel with excellent mechanical properties (tensile strength at a break of 117 kPa and elongation at a break of 1723%). This hydrogel also exhibits strong adhesion and good electrical conductivity (0.13 S/m). Regarding the sensing properties, its temperature sensitivity is 2.749 °C−1 , while its strain detection limit is as low as 0.05%. Based on the unique characteristics of the prepared hydrogel, the as-assembled sensor can detect stress and temperature simultaneously, exhibiting great application potential in human physiological monitoring.

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A low-modulus, adhesive, and highly transparent hydrogel for multi-use flexible wearable sensors

Cited by 16 publications

References 50 publications

An Integrated Capacitive Pressure Sensor Based on Gradient Charge Distribution with High Sensitivity and Fast Response

An Integrated Capacitive Pressure Sensor Based on Gradient Charge Distribution with High Sensitivity and Fast Response

An ultra-soft conductive elastomer for multifunctional tactile sensors with high range and sensitivity

Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

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