Transparent, Low‐Power Pressure Sensor Matrix Based on Coplanar‐Gate Graphene Transistors

Sun, Qijun; Kim, Do Hwan; Park, Sang Sik; Lee, Nae Yoon; Zhang, Yu; Lee, Jung Heon; Cho, Kilwon; Cho, Jeong Ho

doi:10.1002/adma.201400918

Cited by 191 publications

(141 citation statements)

References 36 publications

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“…In fact, graphene based resistive-type pressure sensors have already been developed121314. A single-layer graphene suspended on a cavity12 was demonstrated to have a pressure sensing range of up to 100 kPa but with a rather small sensitivity (2.66 × 10 −5 kPa −1 ).…”

mentioning

confidence: 99%

A Graphene-Based Resistive Pressure Sensor with Record-High Sensitivity in a Wide Pressure Range

Tian

Shu

Wang

et al. 2015

Sci Rep

439

314

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Pressure sensors are a key component in electronic skin (e-skin) sensing systems. Most reported resistive pressure sensors have a high sensitivity at low pressures (<5 kPa) to enable ultra-sensitive detection. However, the sensitivity drops significantly at high pressures (>5 kPa), which is inadequate for practical applications. For example, actions like a gentle touch and object manipulation have pressures below 10 kPa, and 10–100 kPa, respectively. Maintaining a high sensitivity in a wide pressure range is in great demand. Here, a flexible, wide range and ultra-sensitive resistive pressure sensor with a foam-like structure based on laser-scribed graphene (LSG) is demonstrated. Benefitting from the large spacing between graphene layers and the unique v-shaped microstructure of the LSG, the sensitivity of the pressure sensor is as high as 0.96 kPa−1 in a wide pressure range (0 ~ 50 kPa). Considering both sensitivity and pressure sensing range, the pressure sensor developed in this work is the best among all reported pressure sensors to date. A model of the LSG pressure sensor is also established, which agrees well with the experimental results. This work indicates that laser scribed flexible graphene pressure sensors could be widely used for artificial e-skin, medical-sensing, bio-sensing and many other areas.

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mentioning

confidence: 99%

A Graphene-Based Resistive Pressure Sensor with Record-High Sensitivity in a Wide Pressure Range

Tian

Shu

Wang

et al. 2015

Sci Rep

439

314

View full text Add to dashboard Cite

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“…Furthermore, faster response time, high frequency operation (10 kHz) and solution process compatibility makes it a suitable dielectric material for flexible electronics applications. [42] Sun et al [43] reported a development of coplanar gate graphene field effect transistor matrix comprising ion gel as a gate dielectric for pressure sensing applications.…”

Section: Dielectricmentioning

confidence: 99%

“…The device had a high sensitivity of 0.12 kPa-1, low operation voltage and good mechanical stability. [43] These features are very attractive for e-skin in robotics, where fast, reliable and repeatable response is much desired. [2] Other graphene-based solutions, which can also be used in robotic systems, are flexible and transparent strain sensors, [83] flexible supercapacitors [84] and gas sensors on bendable and soft substrates.…”

Section: Carbon Based Materialsmentioning

confidence: 99%

New materials and advances in making electronic skin for interactive robots

et al. 2015

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Flexible electronics has huge potential to bring revolution in robotics and prosthetics as well as to bring about the next big evolution in electronics industry. In robotics and related applications, it is expected to revolutionise the way with which machines interact with humans, real-world objects and the environment. For example, the conformable electronic or tactile skin on robot's body, enabled by advances in flexible electronics, will allow safe robotic interaction during physical contact of robot with various objects. Developing a conformable, bendable and stretchable electronic system requires distributing electronics over large non-planar surfaces and movable components. The current research focus in this direction is marked by the use of novel materials or by the smart engineering of the traditional materials to develop new sensors, electronics on substrates that can be wrapped around curved surfaces. Attempts are being made to achieve flexibility/stretchability in e-skin while retaining a reliable operation. This review provides insight into various materials that have been used in the development of flexible electronics primarily for e-skin applications.

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“…In particular, the selection of suitable active materials plays an important role in dominating the performance of sensors. To date, various materials, including carbon nanotubes (CNTs) [11,[26][27][28][29][30], graphene [31][32][33][34][35][36][37][38][39][40], carbon black [41][42][43][44][45], conductive polymers [16,[46][47][48], metal nanoparticles (NPs) and nanowires [21,[49][50][51][52][53][54][55], semiconductors [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58].…”

Section: Introductionmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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Transparent, Low‐Power Pressure Sensor Matrix Based on Coplanar‐Gate Graphene Transistors

Cited by 191 publications

References 36 publications

A Graphene-Based Resistive Pressure Sensor with Record-High Sensitivity in a Wide Pressure Range

A Graphene-Based Resistive Pressure Sensor with Record-High Sensitivity in a Wide Pressure Range

New materials and advances in making electronic skin for interactive robots

Advanced carbon materials for flexible and wearable sensors

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