Human motion recognition by a shoes-floor triboelectric nanogenerator and its application in fall detection

Wang, Zhen; Gao, Jianshu; Lu, Fuqi; Wang, Fang; You, Zhongyuan; Huang, Mei; Liu, Xiufeng; Li, Yunliang; Liu, Ying

doi:10.1016/j.nanoen.2023.108230

Cited by 32 publications

(16 citation statements)

References 45 publications

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“…The signals of H − in molecular chains of raw BIIR almost disappeared after the reaction with alkylimidazoles. The low signal intensities of H 4 and H 6 detected in the spectra of BIIR were assigned to allylic halide functionality. , Meanwhile, the new signals of H − indicated the successful grafting reaction of BI into BIIR molecular chains. , Owing to the aggregation behavior of ionic pairs, the formation of ionic clusters led to the creation of a dynamic ionic cross-linking network in the system (proved by the curing test in Figure S1).…”

Section: Results and Discussionmentioning

confidence: 96%

“…Flexible and wearable strain sensors have shown tremendous potential for various emerging fields, such as soft robotic skin, , human–machine interface, − health diagnosis, , human motion detection, − and so forth. For these sensors to function as smart wearables, high strain sensitivity under both small and large strains is necessary to accurately monitor physiological activity-induced deformations, such as heartbeats and pulse, as well as substantial human activity-induced deformations, such as muscle and joint movements.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Interface between Conductive Fillers and Elastomeric Ionomers for Highly Sensitive and Stretchable Strain Sensors toward Human Motion Detection

Dai

et al. 2023

ACS Appl. Polym. Mater.

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Flexible elastomer-based wearable sensors have gained tremendous attention due to their potential application in personal health diagnosis and human motion detection. However, challenges persist in achieving high sensitivity, stretchability, and antibacterial properties simultaneously. Herein, ionic crosslinked bromide butyl rubber (BIIR) filled with ionic liquid butylimidazole (BI)modified conductive carbon black (BCCB) is rationally designed and then fabricated into high-performance strain sensors by a facile solution mixing method. The BI not only ion-cross-linked the BIIR but also formed a strong interface between BIIR and conductive carbon black (CCB) through π−cation interactions, which facilitated the uniform dispersion of CCB throughout the BIIR matrix, leading to the formation of a conductive filler network. Based on the synergistic effect of the ionic cross-linking network and conductive filler network, the prepared BCCB/BIIR exhibited a low percolation threshold (1.75 wt %), high electrical conductivity (21.3 S/m), high tensile strength (4.9 MPa) and elongation at break >1200%, high sensitivity with gauge factor values of 9.41 at strains levels within 5% and 2048.89 at high strain levels, and excellent durability under cyclic working conditions. As a result, the BCCB/BIIR can be used as sensors for detecting both weak and large deformations induced by human activities, such as pulse, swallowing, and muscle and joint movements. Additionally, the sensor demonstrated over 99% antibacterial efficacy against Escherichia coli and Staphylococcus aureus, which can improve wearable comfort. The results suggest that the developed method provides a practical and large-scale production approach for fabricating high-performance sensors.

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Section: Results and Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Enhanced Interface between Conductive Fillers and Elastomeric Ionomers for Highly Sensitive and Stretchable Strain Sensors toward Human Motion Detection

Dai

et al. 2023

ACS Appl. Polym. Mater.

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“…A number of sensing technologies and data protocols generally for smart wears have been developed over the years. These sensing technologies include piezoelectricity (Akerfeldt et al , 2014), piezoresistive sensing (Huang et al , 2008), resistive sensing (Kim et al , 2018), impedance, capacitance, inductance (Christopoulos et al , 2014), triboelectric nanogenerator (Wang et al , 2023) and fiber optics (Fresnel reflection and fiber Bragg grating; Raji et al , 2019b). Others include ultrasonic sensing, Global Positioning System (GPS), radio frequency identification technology (RFID) information grid (Duroc and Tedjini, 2018), accelerometers, inertial measurement units (IMUs), Bluetooth for connectivity and reverse electrowetting and so on.…”

Section: Applicable Sensing Technologiesmentioning

confidence: 99%

Review of development trends in smart shoe applications

Raji,

Han,

et al. 2024

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Purpose At the moment, in terms of both research and commercial products, smart shoe technology and applications seem not to attract the same magnitude of attention compared to smart garments and other smart wearables such as wrist watches and wrist bands. The purpose of this study is to fill this knowledge gap by discussing issues regarding smart shoe sensing technologies, smart shoe sensor placements, factors that affect sensor placements and finally the areas of smart shoe applications. Design/methodology/approach Through a review of relevant literature, this study first and foremost attempts to explain what constitutes a smart shoe and subsequently discusses the current trends in smart shoe applications. Discussed in this study are relevant sensing technologies, sensor placement and areas of smart shoe applications. Findings This study outlined 13 important areas of smart shoe applications. It also uncovered that majority of smart shoe functionality are physical activity tracking, health rehabilitation and ambulation assistance for the blind. Also highlighted in this review are some of the bottlenecks of smart shoe development. Originality/value To the best of the authors’ knowledge, this is the first comprehensive review paper focused on smart shoe applications, and therefore serves as an apt reference for researchers within the field of smart footwear.

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“…Wearable electronics and wireless communication network gain the rapid development, which is making a difference in the lifestyle of people. − The stretchable and flexible energy devices that provide energy for the mobile wearable devices and wireless communication network are more significative, gaining widespread attention. − The traditional batteries with disadvantages of large size, inadequate safety, unsatisfactory flexibility, and frequent recharging have not met the requirements of wearable electronics. , Thus, it is highly necessary to develop a smart, integrated, and flexible power supply. Triboelectric nanogenerators (TENGs), based on the coupling of triboelectrification and electrostatic induction, can effectively scavenge the manifold high-entropy mechanical energy and generate electrical energy. − Furthermore, the one-dimensional fiber-based TENGs (F-TENGs) arise rapidly to break through the limitations of the traditional airtight film-based TENGs for the wearable applications. ,− The F-TENG possesses the characteristics of good breathability, comfort, and flexibility, which make it more suitable to wear. , Accompanied by human body motion, F-TENGs can successfully harvest biomechanical energy.…”

Section: Introductionmentioning

confidence: 99%

Core–Sheath Fiber-Based Triboelectric Nanogenerators for Energy Harvesting and Self-Powered Straight-Arm Sit-Up Sensing

Jing

Huang

et al. 2023

ACS Omega

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Fiber-based triboelectric nanogenerators (F-TENGs), a green and sustainable energy-harvesting and transformation technology, hold great potential in the areas of portable energy harvesters and smart wearable sensors. Herein, the core–sheath structure F-TENGs (CF-TENGs) are developed by using continuous production equipment. The CF-TENGs, consisting of an elastic conductive fiber (core layer) and silicone rubber (sheath layer), can simultaneously accomplish stable reversible strain and excellent electrical output performance. High outputs (an open-circuit voltage of 17.5 V and a short-circuit current of 0.1 μA at a frequency of 1 Hz) can be attained when the CF-TENGs (a length of 5 cm) are contacted with a nylon fabric. The CF-TENGs not only act as self-powered sensors for applications in motion monitoring but also efficiently transfer mechanical energy into electric energy. As self-powered wearable sensors, the CF-TENGs can accurately indicate various human physiological movements. Moreover, they can be applied on straight-arm sit-up sensing to achieve standardized sport testing. Importantly, a CF-TENG-based weaved fabric presents high electrical performance to meet requirements as an energy harvester. These CF-TENGs provide a significant insight to facilitate the development of fiber-based triboelectric applications.

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Human motion recognition by a shoes-floor triboelectric nanogenerator and its application in fall detection

Cited by 32 publications

References 45 publications

Enhanced Interface between Conductive Fillers and Elastomeric Ionomers for Highly Sensitive and Stretchable Strain Sensors toward Human Motion Detection

Enhanced Interface between Conductive Fillers and Elastomeric Ionomers for Highly Sensitive and Stretchable Strain Sensors toward Human Motion Detection

Review of development trends in smart shoe applications

Core–Sheath Fiber-Based Triboelectric Nanogenerators for Energy Harvesting and Self-Powered Straight-Arm Sit-Up Sensing

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