Unprecedented sensitivity towards pressure enabled by graphene foam

Zang, Xiaoling; Wang, Xusheng; Yang, Zihao; Wang, Xiaowei; Li, Rui; Chen, Jitao; Ji, Junhui; Xue, Mianqi

doi:10.1039/c7nr05175a

Cited by 42 publications

(23 citation statements)

References 64 publications

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“…Therefore, developing new approaches for preparing graphene foams with satisfactory disorder to fabricate high-performance pressure sensors with acceptable sensitivities, detection limits, response times, and stabilities is significantly important. Due to the consistency of commercial production patterns and methods, the abovementioned templates are difficult to realize because of the highly disordered distributions of pore diameter and pore-wall thickness [ 100 , 101 ]. Furthermore, to some extent, the scaffold materials increase not only the complexity of the sensor structure but also the weight of sensing devices [ 100 ].…”

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

confidence: 99%

“…Furthermore, to some extent, the scaffold materials increase not only the complexity of the sensor structure but also the weight of sensing devices [ 100 ]. Zang and coworkers introduced an ultrasonic dispersion method to solve this problem, and the porous structure was maintained by the freeze-drying process [ 101 ]. Due to the maintenance of the highly disordered structure of the ultrasonically dispersed GO before the freezing process, the RGOF sensors demonstrated an ultrahigh sensitivity of 22.8 kPa −1 , an ultralow detection limit of approximately 0.1 Pa, and a superior separation of 0.2-pascal-scale difference.…”

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

confidence: 99%

“…Inspired by this phenomenon, Wang et al [ 125 ] fabricated a novel self-powered sensing device based on a highly stretchable graphene film and a woven meandering zinc wire. From another point of view, Shi and coworkers found that graphene hybridization could significantly strengthen CNT networks, especially at nanotube junctures, and enhance the resistance to buckling and bundling under cyclic strains up to 20% [ 101 ].

Fig.…”

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

confidence: 99%

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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%

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

confidence: 99%

Fig.…”

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

confidence: 99%

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Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

et al. 2019

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“…GO suspension was obtained as reported in the previous paper. [ 36 ] Expanded graphite (2 g) was mixed with concentrated sulfuric acid (92 g), and the mixture was stirred at a speed of 200 rpm for 24 h. The NaNO 3 (1 g) was added and stirred for 5 min. KMnO 4 (6 g) was very slowly added to the mixture in an ice bath and then stirred at 35 °C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Realizing Long‐Range Orientational Order in Conjugated Polymers via Solventless Polymerization Strategy

Chai

Jiang

et al. 2020

Macro Chemistry & Physics

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Long‐range orientational order in polymers, especially in conjugated polymers (CPs), is of significance in soft matter: from in‐depth understanding of their intrinsic states to fabrication of high‐performance CP‐based devices. However, this field is under‐explored due to lack of approaches to realizing such long‐range order in CPs. Here a universal rule for the synthesis of highly oriented CPs is presented: in a very stable environment with controllable growth rate and size. In order to verify this rule, the growth of highly oriented PPy is realized within the semi‐closed micropores of a graphene foam using a solventless polymerization method at low temperature. These findings provide directions for the construction of ordered CPs. Further explorations of the physical/chemical properties and high‐performance CP‐based device fabrication are anticipated.

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“…In general, porous RGO materials are well known to be sensitive to various stimuli from physical stimuli such as pressure, distance to chemical stimuli such as gas and water vapor, heat, biomolecules. [31][32][33][34][35][36][37][38][39][40][41] In this paper, the key effect factor of reducing the change of UVA photoresponse under various physical/chemical stimuli. By using polydimethylsiloxane (PDMS) as an encapsulation material, we developed a high-performance wearable UVA photodetector, which shows the good device performances under various stimuli and environmental conditions.…”

Section: The Structure and Environmental Stability Of Pdms Encapsulat...mentioning

confidence: 99%

A Wearable Patch Based on Flexible Porous Reduced Graphene Oxide Paper Sensor for Real‐Time and Continuous Ultraviolet Radiation Monitoring

Lee

Hong

Yang

et al. 2021

Adv Materials Technologies

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Real‐time and continuous monitoring of ultraviolet (UV) radiation in daily activity is critical in diverse fields ranging from personal fitness, cosmetics, to medical aspects. Here, a wearable UV monitoring patch that can be easily fixed/removed at desired locations and provide real‐time and continuous UVA levels in daily life is developed. The wearable patch consists of a highly sensitive, flexible graphene sensor for UVA measurement and a multifunctional fabric patch integrated with commercial electronic components for signal processing, wireless transmission. To achieve a high sensitive UVA sensor with high flexibility and long‐term stability, porous reduced graphene oxide (pRGO) papers are fabricated by simple solvent evaporation followed by thermochemical reduction. The flexible UVA sensors based on pRGO papers feature a high UVA photoresponsivity of 125 mA W−1, which is comparable to that of a commercial silicon‐based UV sensor. Furthermore, the polydimethylsiloxane‐encapsulated pRGO (PDMS‐pRGO) sensors exhibit stable UVA photoresponse characteristics that is maintained under severe conditions, such as a large number of bending cycles, thermal heating, and high humidity. The use of wearable patches that enable real‐time, wireless monitoring of personal UVA levels in various practical applications are demonstrated.

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Unprecedented sensitivity towards pressure enabled by graphene foam

Cited by 42 publications

References 64 publications

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

Graphene Nanostructure-Based Tactile Sensors for Electronic Skin Applications

Realizing Long‐Range Orientational Order in Conjugated Polymers via Solventless Polymerization Strategy

A Wearable Patch Based on Flexible Porous Reduced Graphene Oxide Paper Sensor for Real‐Time and Continuous Ultraviolet Radiation Monitoring

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