Construction of sandwich-like porous structure of graphene-coated foam composites for ultrasensitive and flexible pressure sensors

Zhao, Li; Fei, Qiang; Dai, Shou-Wei; Shen, Shi-Chang; Huang, Yun-Zhuo; Huang, Neng-Jian; Zhang, Guodong; Guan, Li-Zhi; Gao, Jiefeng; Song, Yihu; Tang, Long‐Cheng

doi:10.1039/c9nr02672j

Cited by 125 publications

(71 citation statements)

References 70 publications

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“…From the above examples we can see that most of the capacitive tactile sensors have mainly focused on pressure or strain sensors that transduce physical touch into electronic signals, which cannot fulfill the demands of E-skin applications. Indeed, in addition to a position-sensing capability through contact, a 3D-sensing capability for the recognition of 3D shapes and the distance of approaching objects before contact occurs is significantly important both in wearable electronics applications and in the robotics field [ 53 ]. Furthermore, plausible mimics of multifunctional human skin will require multimodal detection, including temperature, humidity, and pressure, integrated into a single pixel [ 54 ].…”

Section: How To Improve the Performance Of Graphene-based Tactile Sensors?mentioning

confidence: 99%

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

et al. 2019

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HIGHLIGHTS• Tremendous progress has been advanced by research into graphene and its derivatives with great benefits toward low-cost, portable, and real-time tactile sensors/electronic skin.• The review presented herein direct future efforts aimed at high-quality graphene-based tactile sensors and their implications for the wider scientific community.• The paper also are informative regarding some basic and crucial issues regarding graphene and its derivatives, such as charge-transport principles, doping/trapping behaviors, correlations between structure/morphology and properties/functions.ABSTRACT Skin is the largest organ of the human body and can perceive and respond to complex environmental stimulations. Recently, the development of electronic skin (E-skin) for the mimicry of the human sensory system has drawn great attention due to its potential applications in wearable human health monitoring and care systems, advanced robotics, artificial intelligence, and human-of graphene materials; (2) state-of-the-art protocols recently developed for high-performance tactile sensing, including representative examples; and (3) perspectives and current challenges for graphene-based tactile sensors in E-skin applications. A summary of these cutting-edge developments intends to provide readers with a deep understanding of the future design of high-quality tactile sensing devices and paves a path for their future commercial applications in the field of E-skin.

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Section: How To Improve the Performance Of Graphene-based Tactile Sensors?mentioning

confidence: 99%

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

et al. 2019

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“…Multi‐walled carbon nanotube (MWCNTs) is relatively cheaper with similar properties while the highly entangled structure makes them difficult for fabrication of composite thin‐films. Zhao et al fabricated a high‐performance pressure sensor via constructing a unique conductive/insulating/conductive sandwich‐like porous structure with ultra‐sensitivity. Interpenetration of the conductive reduce graphene oxide network throughout the porous insulating interlayer produces a highly efficient transition from the non‐conductive to the conductive state, the pressure sensor has a sensitivity of 0.67kPa‐1 (<1.5kPa), fast response/recovery time (∼10ms and ∼16 ms) and outstanding mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Non‐oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra‐high flexibility and sensitivity

Meng

Liu

Cai

et al. 2019

Polymers for Advanced Techs

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It remains challenging to prepare wearable strain and pressure sensors with excellent mechanical properties, ultra‐high flexibility and sensitivity. Electrically conductive graphene platelets (GnPs) with high structural integrity are used in making a composite film fabricated using robust fabrication techniques. The gauge factor for the strain is up to 100 at 0%‐5% strain and 50 at 5%‐30% strain, and the sensitivity to pressure is 2.7×10‐2 kPa‐1 between 0 and 10 kPa and 1.5×10‐4 kPa‐1 between 300 and 1000 kPa. In addition, the flexible sensor demonstrates good repeatability and durability after 1000 cycles of tensile and compression tests. The flexible sensor has fast response ability and a wide operating temperature range, suggesting the excellent response to temperature. The flexible sensor is applied in monitoring several human motions as a wearable device with high accuracy. The ability to detect strain, pressure and temperature of the flexible sensor extends its applications to multifunctional wearable devices.

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“…For all strategies, the resultant micro-structuring has a limited level of tailoring. Incorporation of sponges [ 192 , 193 , 194 , 195 , 196 , 197 , 198 , 199 ], foams [ 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 ], paper [ 208 , 209 , 210 , 211 , 212 ], and natural or synthetic fabrics (such as cotton, leather, silk, polyamide fabric, polyester fabric, polypropylene fabric, polyurethane fibers, and tissue paper) [ 32 , 123 , 134 , 213 , 214 , 215 , 216 , 217 , 218 , 219 , 220 , 221 , 222 , 223 ] that are afterwards chemically modified to become conductive, typically by carbonization [ 123 , 196 , 216 ] or by dip-coating with rGO [ 192 , 195 , 219 , 221 ], graphene [ 134 , 223 ], CNTs of different types [ 209 , <...>…”

Section: Pressure Sensorsmentioning

confidence: 99%

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

Santos

Fortunato

Martins

et al. 2020

Sensors

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Electronic skin (e-skin), which is an electronic surrogate of human skin, aims to recreate the multifunctionality of skin by using sensing units to detect multiple stimuli, while keeping key features of skin such as low thickness, stretchability, flexibility, and conformability. One of the most important stimuli to be detected is pressure due to its relevance in a plethora of applications, from health monitoring to functional prosthesis, robotics, and human-machine-interfaces (HMI). The performance of these e-skin pressure sensors is tailored, typically through micro-structuring techniques (such as photolithography, unconventional molds, incorporation of naturally micro-structured materials, laser engraving, amongst others) to achieve high sensitivities (commonly above 1 kPa−1), which is mostly relevant for health monitoring applications, or to extend the linearity of the behavior over a larger pressure range (from few Pa to 100 kPa), an important feature for functional prosthesis. Hence, this review intends to give a generalized view over the most relevant highlights in the development and micro-structuring of e-skin pressure sensors, while contributing to update the field with the most recent research. A special emphasis is devoted to the most employed pressure transduction mechanisms, namely capacitance, piezoelectricity, piezoresistivity, and triboelectricity, as well as to materials and novel techniques more recently explored to innovate the field and bring it a step closer to general adoption by society.

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Construction of sandwich-like porous structure of graphene-coated foam composites for ultrasensitive and flexible pressure sensors

Abstract: A simple strategy is developed to fabricate ultrasensitive and flexible pressure sensors via constructing a sandwich-like graphene based porous structure.

Cited by 125 publications

References 70 publications

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

Non‐oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra‐high flexibility and sensitivity

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

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