Enhanced Sensitivity of Iontronic Graphene Tactile Sensors Facilitated by Spreading of Ionic Liquid Pinned on Graphene Grid

Kim, Sang Woo; Lee, Seung−Chul; Hwang, Jinhyun; Lee, Eunho; Cho, Kilwon; Kim, Sung Jin; Kim, Do Hwan; Lee, Wi Hyoung

doi:10.1002/adfm.201908993

Cited by 40 publications

(22 citation statements)

References 40 publications

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“…For instance, Guo et al achieved a graded intrafillable architecture-based iontronic PPS with unprecedently high sensitivity ( S min > 220 kPa −1 ) and a broad pressure regime (0.08 Pa–360 kPa) [ 23 ]. Kim et al developed the top floating electrode for iontronic PPS with greatly enhanced sensitivity [ 20 ]. Additionally, recently introducing the remarkable interfacial capacitance for PPS by electrical double layer (EDL) effect is also an effective strategy [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, recently introducing the remarkable interfacial capacitance for PPS by electrical double layer (EDL) effect is also an effective strategy [ 24 ]. For example, Pan et al introduced the iontronic PPS based on the EDL capacitive materials [ 21 , 25 , 26 ], such as graphene [ 20 ], silver [ 21 ], and Au [ 23 ]. Thanks to its high areal capacitance (up to nF or even near µF), the EDL-based iontronic sensor showed much higher sensitivity and broader sensing range than traditional PPS.…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive Pseudocapacitive Iontronic Pressure Sensor with Broad Sensing Range

Gao

Wang

et al. 2021

Nano-Micro Lett.

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Highlights The iontronic pressure sensor achieved an ultrahigh sensitivity (Smin > 200 kPa−1, Smax > 45,000 kPa−1). The iontronic pressure sensor exhibited a broad sensing range of over 1.4 MPa. Pseudocapacitive iontronic pressure sensor using MXene was proposed. ABSTRACT Flexible pressure sensors are unprecedentedly studied on monitoring human physical activities and robotics. Simultaneously, improving the response sensitivity and sensing range of flexible pressure sensors is a great challenge, which hinders the devices’ practical application. Targeting this obstacle, we developed a Ti3C2Tx-derived iontronic pressure sensor (TIPS) by taking the advantages of the high intercalation pseudocapacitance under high pressure and rationally designed structural configuration. TIPS achieved an ultrahigh sensitivity (Smin > 200 kPa−1, Smax > 45,000 kPa−1) in a broad sensing range of over 1.4 MPa and low limit of detection of 20 Pa as well as stable long-term working durability for 10,000 cycles. The practical application of TIPS in physical activity monitoring and flexible robot manifested its versatile potential. This study provides a demonstration for exploring pseudocapacitive materials for building flexible iontronic sensors with ultrahigh sensitivity and sensing range to advance the development of high-performance wearable electronics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Pseudocapacitive Iontronic Pressure Sensor with Broad Sensing Range

Gao

Wang

et al. 2021

Nano-Micro Lett.

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“…Compared to conventional capacitive sensors, supercapacitive interfacial IFS based on an EDL can produce an ultrahigh capacitance per unit area up to several µF cm −2 in the sub-MHz spectrum, where the capacitive value increased by more than 1000 times. [30] Generally, the electrode with excess carriers will generate strong electrostatic force. When the ionic material (solid or liquid) contacts the electronic conductor (electrode), the charged electronic conductor will repel the ions with the same charge, whereas the ions with opposite charge are attracted to the electrode surface.…”

Section: Supercapacitive Interface Effectmentioning

confidence: 99%

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Zhao

Wang

Tang

et al. 2022

Adv Funct Materials

109

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Over the past few decades, flexible sensors have been developed from the "electronic" level to the "iontronic" level, and gradually to the "ionic" level. Ionic flexible sensors (IFS) are one kind of advanced sensors that are based on the concept of ion migration. Compared to conventional electronic sensors, IFS can not only replicate the topological structures of human skin, but also are capable of achieving tactile perception functions similar to that of human skin, which provide effective tools and methods for narrowing the gap between conventional electronics and biological interfaces. In this review, the latest research and developments on several typical sensing mechanisms, compositions, structural design, and applications of IFS are comprehensively reviewed. Particularly, the development of novel ionic materials, structural designs, and biomimetic approaches has resulted in the development of a wide range of novel and exciting IFS, which can effectively sense pressure, strain, and humidity with high sensitivity and reliability, and exhibit self-powered, self-healing, biodegradability, and other properties of the human skin. Furthermore, the typical applications of IFS in artificial skin, human-interactive technologies, wearable health monitors, and other related fields are reviewed. Finally, the perspectives on the current challenges and future directions of IFS are presented.

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“…The GO/GO foam‐based capacitive pressure sensor demonstrated a pressure detection limit of ≈0.24 Pa with high sensitivity (≈0.8 kPa −1 ), outperforming GO‐based capacitive pressure sensors using PDMS [ 650,661 ] or air [ 662 ] as the dielectric. Kim et al [ 663 ] designed a novel iontronic graphene tactile sensor, which consisted of a top float graphene electrode and an ionic liquid droplet pinned on the bottom graphene grid. Under external pressure, the ionic liquid rapidly spreads out, causing a capacitance transition (from several pF to more than hundreds of pF) to form an air‐electric double layer at the interface.…”

Section: D Materials‐based Wearable Sensors For Human Health Applicationsmentioning

confidence: 99%

Scalably Nanomanufactured Atomically Thin Materials‐Based Wearable Health Sensors

Zhang

Jiang

2021

Small Structures

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Wearable multimodal sensors could enable the continuous, non‐invasive, precise monitoring of vital human signals critical for remote health monitoring and telemedicine. Atomically thin materials with intriguing physical characteristics, rich chemistry, and extreme sensitivity to external stimuli are attractive for implementing high‐performance wearable sensors. Despite the increased interest and efforts in 2D materials‐based wearable sensors, reducing the manufacturing and integration costs while improving the product performance remains challenging. Previous review articles provided good coverage discussing the material and device aspects of 2D materials‐based wearable devices. However, few reviews discussed the status quo, prospects, and opportunities for the scalable nanomanufacturing of 2D materials wearable sensors for health monitoring. To fill this gap, the recent advances in 2D materials‐based wearable health sensors are reviewed. The structure design, fabrication processing, the mechanisms of 2D materials‐based wearable health sensors, and their applications for human health monitoring are discussed. More significantly, a systematic discussion of the state‐of‐the‐art and technological gaps for enabling future design and nanomanufacturing of 2D materials wearable health sensors are provided. Finally, the challenges and opportunities associated with the scalable nanomanufacturing of 2D wearable health sensors are discussed.

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Enhanced Sensitivity of Iontronic Graphene Tactile Sensors Facilitated by Spreading of Ionic Liquid Pinned on Graphene Grid

Cited by 40 publications

References 40 publications

Highly Sensitive Pseudocapacitive Iontronic Pressure Sensor with Broad Sensing Range

Highly Sensitive Pseudocapacitive Iontronic Pressure Sensor with Broad Sensing Range

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Scalably Nanomanufactured Atomically Thin Materials‐Based Wearable Health Sensors

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