A Self‐Powered Sensor Mimicking Slow‐ and Fast‐Adapting Cutaneous Mechanoreceptors

Chun, Kyoung Yong; Son, Young Jun; Jeon, Eun Seok; Lee, Se-Han; Han, Chang Soo

doi:10.1002/adma.201706299

Cited by 139 publications

(103 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thanks to the superior sensitivity and signal‐to‐noise ratio, representative radial artery pressure waveforms without any signal amplification and postprocessing clearly indicate three wave components: percussion wave, tidal wave and diastolic wave (P 1 , P 2 , and P 3 ). As common parameters for diagnosis of arterial stiffness, the calculated radial artery augmentation index (AI r = P 2 /P 1 ) and radial diastolic augmentation index (DAI = P 3 /P 1 ) are 0.50 and 0.23 on average, respectively, for a 28‐year‐old female, showing good agreements with reference values . Interestingly, SPS can also provide a basic pulse signal that can induce ballistocardiogram (BCG) with characteristic signs of H, I, J, K, and L by applying slight pressure (Figure S13a, Supporting Information).…”

Section: Resultsmentioning

confidence: 76%

Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture

Wang

Guan

Huang

et al. 2018

Adv Funct Materials

191

168

View full text Add to dashboard Cite

A soft piezoresistive sensor with its unique characteristics, such as human skin, light weight, and multiple functions, yields a variety of possible practical applications to skin-attachable electronics, human-machine interfaces, and electronic skins. However, conventional filler-matrix piezoresistive sensors often suffer from unsatisfactory sensitivity or insufficient measurement range, as well as significant cross-correlation between out-of-plane pressure and in-plane extension. Here, a stretchable piezoresistive sensor (SPS) is realized by combining a hierarchically porous sensing element with a multimodulus device architecture via a full 3D printing process. As a result, the sensor exhibits high sensitivity (5.54 kPa −1 ), large measurement range (from 10 Pa to 800 kPa), limited cross-correlation, and excellent durability. Meanwhile, benefiting from the porous structure and mechanical mismatch design, which efficiently distributes the stress away from the sensing element, the device experiences only 7% resistance change at 50% stretching. This approach is employed to rapidly program and readily manufacture stylish, all-in-one, functional devices for various applications, demonstrating that the technique is promising for customized stretchable electronics.

show abstract

Section: Resultsmentioning

confidence: 76%

Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture

Wang

Guan

Huang

et al. 2018

Adv Funct Materials

191

168

View full text Add to dashboard Cite

show abstract

“…The high‐adhesion v‐AuNW e‐skin motivates us to sense the surface texture. Up to now, most of the reported literatures employed pressure sensor as the sensing component for discerning texture . However, attention should be paid that, based on friction formula,F f = µN , where F f is the resistive force of friction, µ is the coefficient of friction, and N is the perpendicular force, the resulting frictional force is proportional to the applied force .…”

Section: Resultsmentioning

confidence: 99%

Embedding Pinhole Vertical Gold Nanowire Electronic Skins for Braille Recognition

Ling

Gong

Zhai

et al. 2019

Small

View full text Add to dashboard Cite

In this context, it is crucial to improve the interfacial adhesion in order to achieve durability of current e-skin devices for real-world applications. One approach is to introduce interfacial structuring by embedding gold nanopiles into PDMS substrate, which increased its adhesive strength to 2.6 MPa due to the interlocking surface. [19] Another strategy is to introduce chemical modification in order to promote interfacial chemical bonding. A binder polymer (e.g., poly(dopamine)) has been used to promote bonding interactions between silver nanowire and PDMS, which was found to enhance durability under repeating stretching. [20] We have recently also found (3-aminopropyl) trimethoxysilane (APTMS) can efficiently promote the bonding between standing gold nanowires with Ecoflex substrates, leading to exceptionally high stretchability. [21,22] Despite of encouraging progress made so far, interfacial adhesion remains a technical challenge particularly considering the complexity of various filler materials and type of substrates.Here, we report a robust strategy to obtain e-skin patches simply by embedding vertically aligned standing gold nanowires (v-AuNWs) into PDMS. Compared to the stretchable conductor that is typically percolation networks uniformly dispersed in 3D elastomeric matrix, our v-AuNWs are vertically embedded in PDMS surface, more like 2D system yet with efficient electron transport pathways. This may in principle save material usage to achieve comparable conductivity. Unlike lying-down mode percolation network of gold nanowires reported earlier, [5,[23][24][25] our v-AuNWs were vertically grown and closely packed, with each NW connecting its neighboring NWs. A more specific comparison table between lying-down gold nanowire and our v-AuNWs in terms of strain sensitivity, stretchability, conductivity, and adhesion energy were listed in Table S1 in the Supporting Information. Besides, the v-AuNWs allow for control of surface topology by controlling seed concentration and nanowire height. With self-assembled pinhole v-AuNWs films, we could reach a high adhesion of 2.41 MPa. This enables the demonstrations of our v-AuNW-based e-skin in braille recognition. Considering the advantages of using gold in biomedical applications including high chemical inertness, biocompatibility, bandgap matching with p-type semiconductor, and wide electrochemical sensing window, [26] our pinhole v-AuNW embedding strategy may find additional applications in next-generation soft electronics.Electronic skins (e-skins) have the potential to be conformally integrated with human body to revolutionize wearable electronics for a myriad of technical applications including healthcare, soft robotics, and the internet of things, to name a few. One of the challenges preventing the current proof of concept translating to real-world applications is the device durability, in which the strong adhesion between active materials and elastomeric substrate or human skin is required. Here, a new strategy is reported to embed vertically aligned stan...

show abstract

“…Additionally, self-powered patchable sensor platforms to monitor the physiological signals in human activities, [287] such as pulse wave, [288] sweat, [289] respiration, [290] etc. would bring patients comfort and convenience for real-time health care in daily life without the adhesive electrodes or connecting wires.…”

Section: Self-powered Sensors: Beyond Naturementioning

confidence: 99%

The Evolution of Flexible Electronics: From Nature, Beyond Nature, and To Nature

et al. 2020

View full text Add to dashboard Cite

The flourishing development of multifunctional flexible electronics cannot leave the beneficial role of nature, which provides continuous inspiration in their material, structural, and functional designs. During the evolution of flexible electronics, some originated from nature, some were even beyond nature, and others were implantable or biodegradable eventually to nature. Therefore, the relationship between flexible electronics and nature is undoubtedly vital since harmony between nature and technology evolution would promote the sustainable development. Herein, materials selection and functionality design for flexible electronics that are mostly inspired from nature are first introduced with certain functionality even beyond nature. Then, frontier advances on flexible electronics including the main individual components (i.e., energy (the power source) and the sensor (the electric load)) are presented from nature, beyond nature, and to nature with the aim of enlightening the harmonious relationship between the modern electronics technology and nature. Finally, critical issues in next-generation flexible electronics are discussed to provide possible solutions and new insights in prospective exploration directions.

show abstract

A Self‐Powered Sensor Mimicking Slow‐ and Fast‐Adapting Cutaneous Mechanoreceptors

Cited by 139 publications

References 39 publications

Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture

Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture

Embedding Pinhole Vertical Gold Nanowire Electronic Skins for Braille Recognition

The Evolution of Flexible Electronics: From Nature, Beyond Nature, and To Nature

Contact Info

Product

Resources

About