Stretchable, Adhesive, Self-Healable, and Conductive Hydrogel-Based Deformable Triboelectric Nanogenerator for Energy Harvesting and Human Motion Sensing

Li, Dong; Wang, Mingxu; Wu, Jiajia; Zhu, Chunhong; Shi, Jian; Morikawa, Hideaki

doi:10.1021/acsami.1c23176

Cited by 121 publications

(73 citation statements)

References 59 publications

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“…It can be concluded that the sensitivity of both the voltage and resistance responses of the Pp-250 improved after mixing the two fillers. Compared with other research results, ,,,,,− the Pp-250 prepared by us has more advantages in response time and recovery time indexes and can achieve a fast and sensitive response (Figure g).…”

Section: Resultsmentioning

confidence: 64%

“…Hydrogels are flexible materials with three-dimensional cross-linked hydrophilic polymer networks. − Conductive hydrogels combine the electrical properties of conductive materials with the flexibility and biocompatibility of hydrogels and have been widely used in flexible sensors, − wearable electronic devices, electronic skin, and other fields. In recent years, wearable sensors based on conductive hydrogels have attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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Conductive hydrogels have attracted attention because of their wide application in wearable devices. However, it is still a challenge to achieve conductive hydrogels with high sensitivity and wide frequency band response for smart wearable strain sensors. Here, we report a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors. The composite hydrogel consists of cross-linked chitosan quaternary ammonium salt (CHACC) as the hydrogel matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) as the piezoelectric filler. A one-pot thermoforming and solution exchange method was used to synthesize the CHACC/PEDOT: PSS/PVDF-TrFE hydrogel. The hydrogel-based strain sensor exhibits very high sensitivity (GF: 19.3), fast response (response time: 63.2 ms), and wide frequency range (response frequency: 5−25 Hz), while maintaining excellent mechanical properties (elongation at break up to 293%). It can be concluded that enhanced strain-sensing properties of the hydrogel are contributed to both greater change in the relative resistance under stress and wider response to dynamic and static stimulus by adding PVDF-TrFE. This has a broad application in monitoring human motion, detecting subtle movements, and identifying object contours and a hydrogel-based array sensor. This work provides an insight into the design of composite hydrogels based on piezoelectric and piezoresistive sensing with applications for wearable sensors.

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Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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“…2 b). Wang et al [ 28 ] used polyacrylamide/polyacrylic acid/graphene/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hydrogel incorporated with CNTs and polydimethylsiloxane (PDMS) to fabricate TENG, which can be used to monitor human activities and harvest energy from human motion. Piezoelectric sensors mostly require inorganic materials to synthesize piezoelectric composites to improve their performance, which is still a major challenge.…”

Section: Physical Sensormentioning

confidence: 99%

Skin-Attachable Sensors for Biomedical Applications

Hua

Jiang

Xie

et al. 2022

Biomedical Materials & Devices

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With the growing concern about human health issues, especially during the outbreak of the COVID-19 pandemic, the demand for personalized healthcare regarding disease prevention and recovery is increasing. However, tremendous challenges lie in both limited public medical resources and costly medical diagnosis approaches. Recently, skin-attachable sensors have emerged as promising health monitoring platforms to overcome such difficulties. Owing to the advantages of good comfort and high signal-to-noise ratio, skin-attachable sensors enable household, real-time, and long-term detection of weak physiological signals to efficiently and accurately monitor human motion, heart rate, blood oxygen saturation, respiratory rate, lung and heart sound, glucose, and biomarkers in biomedical applications. To further improve the integration level of biomedical skin-attachable sensors, efforts have been made in combining multiple sensing techniques with elaborate structural designs. This review summarizes the recent advances in different functional skin-attachable sensors, which monitor physical and chemical indicators of the human body. The advantages, shortcomings, and integration strategies of different mechanisms are presented. Specially, we highlight sensors monitoring pulmonary function such as respiratory rate and blood oxygen saturation for their potential usage in the COVID-19 pandemic. Finally, the future development of skin-attachable sensors is envisioned.

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“…Flexible electronic devices such as wearable sensors, − nanogenerators, , and flexible batteries , have attracted social-level attention, because of their portability and wide range of applications. Various strain and pressure-based wearable sensors have been fabricated to fulfill the requirements of diverse application scenarios. , Notably, hydrogel-based flexible electronics have been widely studied, because of their versatility, mechanical compliance, and good biocompatibility .…”

Section: Introductionmentioning

confidence: 99%

Bio-Inspired Instant Underwater Adhesive Hydrogel Sensors

Guo

Sun

et al. 2022

ACS Appl. Mater. Interfaces

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Underwater adhesion plays an essential role in soft electronics for the underwater interface. Although hydrogel-based electronics are of great interest, because of their versatility, water molecules prevent hydrogels from adhering to substrates, thus bottlenecking further applications. Herein, inspired by the barnacle proteins, MXene/PHMP hydrogels with strong repeatable underwater adhesion are developed through the random copolymerization of 2-phenoxyethyl acrylate, 2-methoxyethyl acrylate, and N-(2-hydroxyethyl) acrylamide with the presence of MXene nanosheets. The hydrogels are mechanically tough (elastic modulus of 32 kPa, fracture stress of 0.11 MPa), and 2-phenoxyethyl acrylate (PEA) with aromatic groups endows the hydrogel with nonswelling property and prevents water molecules from invading the adhesive interface, rendering the hydrogels an outstanding adhesive behavior toward various substrates (including glass, iron, polyethylene terephthalate (PET), porcine). Besides, dynamic physical interactions allow for instant and repeatable underwater adhesion. Furthermore, the MXene/PHMP hydrogels exhibit a high conductivity (0.016 S/m), fast responsiveness, and superior sensitivity as a strain sensor (gauge factor = 7.17 at 200%–500% strain) and pressure sensor (0.63 kPa–1 at 0–70 kPa). The underwater applications of bionic hydrogel-based sensors have been demonstrated, such as human motion, pressure sensing, and holding objects. It is anticipated that the instant and repeatable underwater adhesive hydrogel-based sensors extend the underwater applications of hydrogel electronics.

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Stretchable, Adhesive, Self-Healable, and Conductive Hydrogel-Based Deformable Triboelectric Nanogenerator for Energy Harvesting and Human Motion Sensing

Cited by 121 publications

References 59 publications

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Skin-Attachable Sensors for Biomedical Applications

Bio-Inspired Instant Underwater Adhesive Hydrogel Sensors

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