Highly Sensitive and Bendable Capacitive Pressure Sensor and Its Application to 1 V Operation Pressure‐Sensitive Transistor

Joo, Yi-Seok; Yoon, Jaeyoung; Ha, Jewook; Kim, Tae-Hoon; Lee, Seung Hwan; Lee, Byeongmoon; Pang, Changhyun; Hong, Yongtaek

doi:10.1002/aelm.201600455

Cited by 84 publications

(70 citation statements)

References 28 publications

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“…The high sensitivity and low‐voltage operation of our flexible OTFT sensors using the novel PAA:PEG dielectric are much better than those of the devices in previous reports . We summarized some representative works on OTFT‐based pressure sensors and compared our results with them (as shown in Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 96%

“…To date, considerable efforts have been made to fabricate OTFT‐based pressure sensors by designing dielectric/electrode materials, using new semiconductors, and optimizing device structures . With a lamination technique, microstructured polydimethylsiloxane (PDMS) was integrated into OTFTs as a dielectric, resulting in active pressure sensors with high sensitivity and fast response .…”

Section: Introductionmentioning

confidence: 99%

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Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Liu

Yin

Wang

et al. 2018

Adv Funct Materials

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Organic thin-film transistors (OTFTs) can provide an effective platform to develop flexible pressure sensors in wearable electronics due to their good signal amplification function. However, it is particularly difficult to realize OTFT-based pressure sensors with both low-voltage operation and high sensitivity. Here, controllable polyelectrolyte composites based on poly(ethylene glycol) (PEG) and polyacrylic acid (PAA) are developed as a type of highcapacitance dielectrics for flexible OTFTs and ultrasensitive pressure sensors with sub-1 V operation. Flexible OTFTs using the PAA:PEG dielectrics show good universality and greatly enhanced electrical performance under a much smaller operating voltage of −0.7 V than those with a pristine PAA dielectric. The low-voltage OTFTs also exhibit excellent flexibility and bending stability under various bending radii and long cycles. Flexible OTFT-based pressure sensors with low-voltage operation and superhigh sensitivity are demonstrated by using a suspended semiconductor/dielectric/gate structure in combination with the PAA:PEG dielectric. The sensors deliver a record high sensitivity of 452.7 kPa −1 under a low-voltage of −0.7 V, and excellent operating stability over 5000 cycles. The OTFT sensors can be built into a wearable sensor array for spatial pressure mapping, which shows a bright potential in flexible electronics such as wearable devices and smart skins.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Liu

Yin

Wang

et al. 2018

Adv Funct Materials

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show abstract

“…For instance, many reported flexible e‐skins exhibited a saturated response in medium‐high pressure regime, leading to poor discrimination . There are typically four types of e‐skins based on the sensing mechanism, including resistive, capacitive, piezoelectric, and triboelectric types . Particularly, capacitive e‐skins present advantages of simple device construction, fast response time, low power consumption, and higher sensitivity than other sensors, and are thereby widely explored .…”

Section: Introductionmentioning

confidence: 99%

Ionic Skin with Biomimetic Dielectric Layer Templated from Calathea Zebrine Leaf

Qiu

Wan

Zhou

et al. 2018

Adv Funct Materials

257

260

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Flexible electronic skins (e-skins) with high sensitivity and broad-range pressure sensing are highly desired in artificial intelligence, and humanmachine interaction. Capacitive-type e-skins have a simple configuration, but the change in dimensions of the dielectric layer is often quite limited, although introducing surface microstructures might improve the sensitivity in some extent. Moreover, such surface structures typically require costly microfabrication methods to fabricate. Here, a low-cost microstructured ionic gel (MIG) with uniform cone-like surface microstructures for highperformance capacitive e-skins is reported. The MIG film is templated from a Calathea zebrine leaf using soft lithography, and sandwiched by two flexible electrodes. The device exhibits a low limit of detection down to 0.1 Pa, a ultrahigh sensitivity of 54.31 kPa −1 in the low pressure regime (<0.5 kPa), and the sensitivity keeps larger than 1 kPa −1 over a broad-range pressure from 0.1 Pa to 115 kPa. Electric double layers (EDL) form on both the top and bottom interfaces, and the area of EDL of the rough interface increases as the cones are compressed. Such ionic skins with biomimetic gel templated Calathea zebrine leaf allow for sensitive tactile sensing in the applications of human-machine interaction.

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“…E‐skins based on capacitive, [ 10 ] piezoresistive, [ 11,12 ] piezoelectric, [ 13 ] and triboelectric [ 14 ] sensing mechanisms have been demonstrated. Capacitive e‐skins are particularly promising because they have a simple design, high sensitivity, fast response up to the limit of viscoelasticity, high accuracy, less drift, and very low limit of detection.…”

Section: Figurementioning

confidence: 99%

Plant‐Based Biodegradable Capacitive Tactile Pressure Sensor Using Flexible and Transparent Leaf Skeletons as Electrodes and Flower Petal as Dielectric Layer

Elsayes

Sharma

Yiannacou

et al. 2020

Advanced Sustainable Systems

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In biomedical sciences, there is demand for electronic skins with highly sensitive tactile sensors, having applications in patient monitoring, human–machine interfaces, and on‐body sensors. In clinical applications, it would be especially beneficial if the sensors would be disposable. Here, an all plant‐material‐based biodegradable capacitive tactile pressure sensor for disposable electronic skins is reported. Silver‐nanowire‐coated leaf skeletons are used as breathable and flexible electrodes while freeze‐dried rose petals are used as the dielectric layer. The leaf skeleton electrodes have a rough fractal‐like architecture, which provides good adhesion to the silver nanowires and maintains interconnections between the silver nanowires when the electrodes are bent. The electrodes display low constant resistance up to curvature of 800 m−1. The rose petal dielectric layer has a multiscale 3D cell wall microstructure, which compresses elastically when subjected to pressure. The fabricated sensor can respond to pressures ranging from 0.007 to at least 60 kPa, with a maximum sensitivity of ≈0.08 kPa−1. The signal is stable for at least 5000 pressure cycles, after an initial break‐in period. Owing to the all biomaterial constituents, the sensor is biodegradable under aqueous conditions. The sensor is successfully applied as an e‐skin in touch sensing and gesture monitoring.

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Highly Sensitive and Bendable Capacitive Pressure Sensor and Its Application to 1 V Operation Pressure‐Sensitive Transistor

Cited by 84 publications

References 28 publications

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing

Ionic Skin with Biomimetic Dielectric Layer Templated from Calathea Zebrine Leaf

Plant‐Based Biodegradable Capacitive Tactile Pressure Sensor Using Flexible and Transparent Leaf Skeletons as Electrodes and Flower Petal as Dielectric Layer

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