Natural Plant Materials as Dielectric Layer for Highly Sensitive Flexible Electronic Skin

Wan, Yongbiao; Qiu, Zhiguang; Huang, Jun; Yang, Jingyi; Wang, Qi; Lü, Peng; Yang, Junlong; Zhang, Jianming; Huang, Shaobin; Wu, Zhigang; Guo, Chuan Fei

doi:10.1002/smll.201801657

Cited by 157 publications

(160 citation statements)

References 35 publications

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“…The sensing performance of the flexible capacitive pressure sensor is evaluated in Figure . The sensitivity of a capacitive sensor is given by

\frac{δ (\frac{normalΔ C}{C_{0}})}{δ P}

where C 0 represents initial capacitance, ∆ C corresponds to capacitance change ( C − C 0 ), and P is the compressive pressure applied . Figure S1 (Supporting Information) shows the relative change in capacitance of samples, in the range of 0–145 kPa.…”

Section: Resultsmentioning

confidence: 99%

“…Especially communication of home service robots and artificial limbs with human beings is carried out via friendly human–machine interaction . An ideal e‐skin is expected to be highly flexible, sensitive, lightweight, easy to fabricate, inexpensive, and should be capable of performing like the natural skin, which feels tactile pressures ranging from light touches (0–10 kPa) to object handling levels (10–100 kPa) . Generally, e‐skin pressure sensors use piezoresistive, piezocapacitive, piezoelectric, and triboelectric sensing mechanisms to transduce applied pressure into an electrical signal.…”

Section: Introductionmentioning

confidence: 99%

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Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

Asghar

Zhou

et al. 2020

Adv Materials Technologies

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Flexible pressure sensors are highly desirable in artificial intelligence, health monitoring, and soft robotics. Microstructuring of dielectrics is the common strategy employed to improve the performance of capacitive type pressure sensors. Herein, a novel, low‐cost, large‐area compatible, and mold‐free technique is reported in which magnetically grown microneedles are self‐assembled from a film of curable magnetorheological fluid (CMRF) under the influence of a vertical curing magnetic field (Bcuring). After optimizing the microneedles' fabrication parameters, i.e., magnetic particles' (MPs') concentration and Bcuring intensity, piezocapacitive sensors capable of wide range pressure sensing (0–145 kPa) with ultrafast response time (50 ms), high cyclic stability (>9000 cycles), as well as very low detection limit (1.9 Pa) are obtained. Sensor properties are found dependent on microneedles' fabrication parameters that are controllable, produce variable‐sized microneedles, and allow to govern sensing properties according to desired applications. Finally, the sensor is employed in holding a bottle with different weights, human breath, and motion monitoring, which demonstrate its great potential for the applications of human–machine interaction, human health monitoring, and intelligent soft robotics.

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“…The sensing performance of the flexible capacitive pressure sensor is evaluated in Figure . The sensitivity of a capacitive sensor is given by

\frac{δ (\frac{normalΔ C}{C_{0}})}{δ P}

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

Asghar

Zhou

et al. 2020

Adv Materials Technologies

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show abstract

“…The sensor also has a remarkable frequency‐dependent and temperature‐dependent response (Figure S10, Supporting Information), which is a typical phenomenon in iontronic devices. [ 30 ]…”

Section: Figurementioning

confidence: 99%

Highly Transparent and Flexible Iontronic Pressure Sensors Based on an Opaque to Transparent Transition

et al. 2020

Self Cite

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Human–computer interfaces, smart glasses, touch screens, and some electronic skins require highly transparent and flexible pressure‐sensing elements. Flexible pressure sensors often apply a microstructured or porous active material to improve their sensitivity and response speed. However, the microstructures or small pores will result in high haze and low transparency of the device, and thus it is challenging to balance the sensitivity and transparency simultaneously in flexible pressure sensors or electronic skins. Here, for a capacitive‐type sensor that consists of a porous polyvinylidene fluoride (PVDF) film sandwiched between two transparent electrodes, the challenge is addressed by filling the pores with ionic liquid that has the same refractive index with PVDF, and the transmittance of the film dramatically boosts from 0 to 94.8% in the visible range. Apart from optical matching, the ionic liquid also significantly improves the signal intensity as well as the sensitivity due to the formation of an electric double layer at the dielectric‐electrode interfaces, and improves the toughness and stretchability of the active material benefiting from a plasticization effect. Such transparent and flexible sensors will be useful in smart windows, invisible bands, and so forth.

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“…However, due to the incompressible and viscoelastic of the elastomeric dielectrics, the sensitivity and response time of capacitive‐type mechanical sensors are still limited. To address this challenge, researchers developed dielectric materials with microstructures (eg, pores, pyramids, microcylinders, microspheres, beads, and needles) (Figure C‐G). As shown in Figure C, an ultralow limit (0.1 Pa) pressure sensor based on a microporous dielectric elastomer was reported .…”

Section: Skin‐inspired Mechanical Sensorsmentioning

confidence: 99%

Physical sensors for skin‐inspired electronics

Zhang

Wang

et al. 2019

InfoMat

166

136

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Skin, the largest organ in the human body, is sensitive to external stimuli.In recent years, an increasing number of skin-inspired electronics, including wearable electronics, implantable electronics, and electronic skin, have been developed because of their broad applications in healthcare and robotics.Physical sensors are one of the key building blocks of skin-inspired electronics. Typical physical sensors include mechanical sensors, temperature sensors, humidity sensors, electrophysiological sensors, and so on. In this review, we systematically review the latest advances of skin-inspired mechanical sensors, temperature sensors, and humidity sensors. The working mechanisms, key materials, device structures, and performance of various physical sensors are summarized and discussed in detail. Their applications in health monitoring, human disease diagnosis and treatment, and intelligent robots are reviewed. In addition, several novel properties of skin-inspired physical sensors such as versatility, self-healability, and implantability are introduced. Finally, the existing challenges and future perspectives of physical sensors for practical applications are discussed and proposed. K E Y W O R D Selectronics skin, flexible electronics, humidity sensors, mechanical sensors, temperature sensors, wearable sensors

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Natural Plant Materials as Dielectric Layer for Highly Sensitive Flexible Electronic Skin

Cited by 157 publications

References 35 publications

Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

Highly Transparent and Flexible Iontronic Pressure Sensors Based on an Opaque to Transparent Transition

Physical sensors for skin‐inspired electronics

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