Dynamic Pressure Mapping of Personalized Handwriting by a Flexible Sensor Matrix Based on the Mechanoluminescence Process

Wang, Xiandi; Zhang, Hanlu; Yu, Ruomeng; Dong, Lin; Peng, Dengfeng; Zhang, Aihua; Zhang, Yan; Liu, Hong; Pan, Caofeng; Wang, Zhong Lin

doi:10.1002/adma.201405826

Cited by 532 publications

(412 citation statements)

References 34 publications

(9 reference statements)

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“…Besides, static pressure mapping has been achieved in these devices, while dynamic pressure detections are rarely explored. [ 33 ] Therefore, it is exigent to develop a novel fl exible pressure sensing system in cost-effective manners through simple fabrication process to detect static/dynamic pressure distributions with high sensitivity, fast response and pragmatic spatial resolution.In this work, we design and fabricate a fl exible/wearable multifunctional sensor array with low costs and simple fabrication processes for highly-sensitive contact/pressure/strain detections. The PDMS/Ag/Ecofl ex/Ag/PDMS sandwichstructured sensor array possesses impressive stretchability by taking advantage of serpentine-shaped [ 34,35 ] Ag electrodes, which show insignifi cant resistance changes under stretching, compressing and torsions.…”

mentioning

confidence: 99%

Flexible, Stretchable and Wearable Multifunctional Sensor Array as Artificial Electronic Skin for Static and Dynamic Strain Mapping

Zhao

Hua

et al. 2015

Adv Elect Materials

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248

183

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and triboelectric [25][26][27][28][29] sensing mechanisms. Poor stretchability/fl exibility of piezoresistive and piezoelectric devices has been a signifi cant obstacle to wearable electronic skins, since most of these devices are commonly assembled on stiff substrates. [ 1,8 ] Capacitive-change based pressure sensors featuring with high sensitivity, negligible temperature fl uctuations [ 2 ] and imposing stretchability, have drawn tremendous research interests and been implemented in several confi gurations, including microstructured rubber layers, [ 13,15,30 ] polymer transistors, [ 1,31 ] self-healing composites [ 32 ] and orderly array inorganic nanowires. [ 8,14,19,20 ] However, most of these previously reported devices suffer from complicated fabrication process, high costs and low yields, preventing them from mass productions and practical applications in the future. Besides, static pressure mapping has been achieved in these devices, while dynamic pressure detections are rarely explored. [ 33 ] Therefore, it is exigent to develop a novel fl exible pressure sensing system in cost-effective manners through simple fabrication process to detect static/dynamic pressure distributions with high sensitivity, fast response and pragmatic spatial resolution.In this work, we design and fabricate a fl exible/wearable multifunctional sensor array with low costs and simple fabrication processes for highly-sensitive contact/pressure/strain detections. The PDMS/Ag/Ecofl ex/Ag/PDMS sandwichstructured sensor array possesses impressive stretchability by taking advantage of serpentine-shaped [ 34,35 ] Ag electrodes, which show insignifi cant resistance changes under stretching, compressing and torsions. Fast response (ca. 100 ms) mapping of both static and dynamic contact/pressure/strain distributions are demonstrated, with detection limit of 6 Pa and stretching up to 70%. By monitoring the capacitance changes of the sensor array, a linear response to external pressures is derived based on capacitive sensing working mechanism. Featuring with low-cost, easy-fabrication, linear-response and high reliability, these sensor arrays may become promising candidate for highly-sensitive force detections, gesture controls, imaging of spatial pressure distributions, and fi nd potential applications in advanced robotics, human-machine interfaces, next-generation prosthetics and healthcare monitoring devices.Artifi cial electronic skin consists of mechanically fl exible and stretchable sensor networks that can accommodate irregular surfaces and spatially map/quantify various stimuli, such as strains, pressures, and temperatures to imitate the human somatosensory system. Here, a fl exible/wearable multifunctional sensor array is designed and fabricated in a cost-effective manner through simple fabrication procedures for highly-sensitive contact/ pressure/strain detections. Composed of PET-based Ag serpentine-shaped electrodes, the sensor array is implemented for static and dynamic mapping of spatial contact/pressure/strain distributions in ...

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confidence: 99%

Flexible, Stretchable and Wearable Multifunctional Sensor Array as Artificial Electronic Skin for Static and Dynamic Strain Mapping

Zhao

Hua

et al. 2015

Adv Elect Materials

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248

183

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“…Because of their non-centrosymmetric crystal structures, both phosphors show piezoelectricity, i.e., an internal electric field arises due to the application of stress. ZnS:1%Mn 2+ is very sensitive to friction and is applicable in dynamic pressure mapping, especially above 10 MPa [7], but the response to extension was not reported yet, which could reveal interesting physics of ML.…”

Section: Resultsmentioning

confidence: 99%

Mechanoluminescent Materials: A New Way to Analyze Stress by Light

Feng

Michels

Lamberti

et al. 2018

The 18th International Conference on Experimental Mechanics

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Abstract:The monitoring of stress changes in structural components under various kinds of dynamical loading is crucial for the assessment of their integrity and lifetime. In addition to many methodologies available, such as strain gauges, optical fiber sensors, X-Ray diffraction and digital image correlation, we introduce a novel non-contact method to visualize stress distributions based on mechanoluminescence (ML). ML is a phenomenon occurring in some materials that emit light upon an applied stress level. In this paper, we develop the ML material (Ca0.4Sr0.6)Al2Si2O8:1%Eu 2+ ,1%Ho 3+ , a glow-in-the-dark material, to visualize stress distribution in a disc, as well as the stress field of an ultrasonic transducer. The properties of defects in the ML phosphors, which are responsible for ML in this material, are vital for stress visualization.

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“…74 The core of the piezophotonic property is a piezoelectric‐induced photon‐emission process. The electron energy band of piezoelectric ZnS is tilted by the piezopotential under pressure, which can promote the excitation of Mn 2+ ions, and the following de‐excitation gives rise to photon emission in the form of yellow light with an intensity positively correlated to the applied pressure.…”

Section: High‐performance E‐skin: Design and Fabricationmentioning

confidence: 99%

Recent Progress in Electronic Skin

et al. 2015

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The skin is the largest organ of the human body and can sense pressure, temperature, and other complex environmental stimuli or conditions. The mimicry of human skin's sensory ability via electronics is a topic of innovative research that could find broad applications in robotics, artificial intelligence, and human–machine interfaces, all of which promote the development of electronic skin (e‐skin). To imitate tactile sensing via e‐skins, flexible and stretchable pressure sensor arrays are constructed based on different transduction mechanisms and structural designs. These arrays can map pressure with high resolution and rapid response beyond that of human perception. Multi‐modal force sensing, temperature, and humidity detection, as well as self‐healing abilities are also exploited for multi‐functional e‐skins. Other recent progress in this field includes the integration with high‐density flexible circuits for signal processing, the combination with wireless technology for convenient sensing and energy/data transfer, and the development of self‐powered e‐skins. Future opportunities lie in the fabrication of highly intelligent e‐skins that can sense and respond to variations in the external environment. The rapidly increasing innovations in this area will be important to the scientific community and to the future of human life.

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Dynamic Pressure Mapping of Personalized Handwriting by a Flexible Sensor Matrix Based on the Mechanoluminescence Process

Cited by 532 publications

References 34 publications

Flexible, Stretchable and Wearable Multifunctional Sensor Array as Artificial Electronic Skin for Static and Dynamic Strain Mapping

Flexible, Stretchable and Wearable Multifunctional Sensor Array as Artificial Electronic Skin for Static and Dynamic Strain Mapping

Mechanoluminescent Materials: A New Way to Analyze Stress by Light

Recent Progress in Electronic Skin

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