Human joint enabled flexible self-sustainable sweat sensors

Li, Hu; Chang, Tianrui; Gai, Yansong; Liang, Kui; Jiao, Yanli; Li, Dengfeng; Jiang, Xinran; Wang, Yan; Huang, Xingcan; Wu, Han; Liu, Yiming; Li, Jian; Bai, Ye; Geng, Kai; Zhang, Nianrong; Hua, Meng; Huang, Danqiong; Li, Zhou; Yu, Xinge; Chang, Lingqian

doi:10.1016/j.nanoen.2021.106786

Cited by 47 publications

(38 citation statements)

References 64 publications

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“…Influenced by motion artifacts, hydrogels with weak extensibility have low monitoring accuracy when applied to the skin. 14,15 Besides, the presence of additional adhesives in e-skin can significantly hinder the signal transmission sensitivity. 16 Therefore, it is very important to prepare self-adhesive conformal hydrogels with good extensibility.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

et al. 2022

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“…In addition to the physical-related sensory information, relevant physiological parameters also play an important role in monitoring people’s daily health conditions and can be utilized as a valuable reference for medical diagnosis in smart homes. , Based on this consideration, Li et al developed a self-sustainable wearable sweat sensor as depicted in Figure . Different from the above-mentioned works that use mechanical sensors based on piezoelectric/triboelectric materials for physiological information monitoring, the flexible PENG unit in this work is to collect the biomechanical energy of human joint movements during daily activities, which can be further utilized as the power source of the sweat sensor array, i.e ., ion-selective electrodes, to achieve a battery-free system.…”

Section: Wearable Devicesmentioning

confidence: 99%

“…In this regard, self-sustained devices and systems that can operate independently without external power supplies are highly promising and desirable. Energy harvesters are the key enabler for such self-sustained systems, since they can scavenge the ambient available energy and convert it into electricity as the power source. − Differentiated by the transducing mechanisms, energy harvesters can be classified into different types, e.g ., photovoltaic or solar cell based on the photovoltaic effect, thermoelectric generator (TEG) based on the Seebeck effect, − pyroelectric nanogenerator (PyENG) based on the pyroelectric effect, , electromagnetic generator (EMG) based on the electromagnetic induction, − piezoelectric nanogenerator (PENG) based on the piezoelectric effect, − triboelectric nanogenerator (TENG) based on the contact electrification and electrostatic induction, − etc . Since its first invention in 2012, TENG has been vastly investigated and proven as a highly promising energy harvesting technology for ubiquitous mechanical energy harvesting (human activities, vibration, wave, wind, rain, etc .…”

Section: Introductionmentioning

confidence: 99%

Progress of Advanced Devices and Internet of Things Systems as Enabling Technologies for Smart Homes and Health Care

et al. 2022

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In the Internet of Things (IoT) era, various devices (e.g., sensors, actuators, energy harvesters, etc.) and systems have been developed toward the realization of smart homes/buildings and personal health care. These advanced devices can be categorized into ambient devices and wearable devices based on their usage scenarios, to enable motion tracking, health monitoring, daily care, home automation, fall detection, intelligent interaction, assistance, living convenience, and security in smart homes. With the rapidly increasing number of such advanced devices and IoT systems, achieving fully self-sustained and multimodal intelligent systems is becoming more and more important to realize a sustainable and all-in-one smart home platform. Hence, in this Review, we systematically present the recent progress of the development of advanced materials, fabrication techniques, devices, and systems for enabling smart home and health care applications. First, advanced polymer, fiber, and fabric materials as well as their respective fabrication techniques for large-scale manufacturing are discussed. After that, functional devices classified into ambient devices (at home ambiance such as door, floor, table, chair, bed, toilet, window, wall, etc.) and wearable devices (on body parts such as finger, wrist, arm, throat, face, back, etc.) are presented for diverse monitoring and auxiliary applications. Next, the current developments of self-sustained systems and intelligent systems are reviewed in detail, indicating two promising research directions in this field. Last, conclusions and outlook pinpointed on the existing challenges and opportunities are provided for the research community to consider.

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“…Nevertheless, their standalone operation requires renewable, sustainable, and portable power sources. − Commercial electronics mostly rely on batteries as a power source; however, batteries have several disadvantages, such as their limited lifetime and the fact that their production and use entail the generation of large amounts of waste. Therefore, there is a growing interest in the development of self-powered devices − to be used as portable power systems and overcome the aforementioned challenges. Various self-powered devices based on piezoelectric, piezoresistive, and triboelectric materials have so far been developed.…”

Section: Introductionmentioning

confidence: 99%

Elastic and Skin-Contact Triboelectric Nanogenerators and Their Applicability in Energy Harvesting and Tactile Sensing

Pratap

Gogurla

Kim

2022

ACS Appl. Electron. Mater.

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Skin-actuated self-powered devices based on triboelectric nanogenerators (TENGs) have recently garnered increasing attention, as they can be used to develop electronic skins for healthcare, robotic intelligence, and human interface devices. TENGs typically require tribonegative materials to enable the top layers to either be in contact with or be insulated from other specific materials, resulting in suboptimal performance under practical conditions. Here, we describe the fabrication of a soft, transparent, flexible, stretchable, and skin-actuated TENG device using nanostructured polydimethylsiloxane with a silver nanowire transparent contact as a power source to activate commercial small electronic devices. The nanostructured TENG exhibited a high open-circuit voltage of ∼128 V upon contact with the human skin. This value was substantially higher than that of a TENG with no nanostructure (∼51.6 V), which was attributed to a higher effective contact area in the former. An ∼266 μW/ cm 2 power density could be achieved with the nanostructured TENG upon finger touch stimulation. The resulting electrical output power was then used to activate small commercial electronic devices such as light-emitting diodes. Additionally, due to its high transparency and signal response, the developed TENG was successfully implemented as a sensory platform to build a 3 × 3 keypad. The TENG devices were affixed to several objects to monitor daily activities and harvest biomechanical energy. Our findings suggest that the skin-stimulated elastomer-based TENG developed herein could open possibilities in the development of wearable sensors and power sources.

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Human joint enabled flexible self-sustainable sweat sensors

Cited by 47 publications

References 64 publications

Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

Progress of Advanced Devices and Internet of Things Systems as Enabling Technologies for Smart Homes and Health Care

Elastic and Skin-Contact Triboelectric Nanogenerators and Their Applicability in Energy Harvesting and Tactile Sensing

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