Superelastic, Macroporous Polystyrene‐Mediated Graphene Aerogels for Active Pressure Sensing

Zhang, Panpan; Lv, Lihua; Cheng, Zhihua; Yuan, Liang; Zhou, Qinhan; Zhao, Yang; Qu, Liangti

doi:10.1002/asia.201600038

Cited by 37 publications

(22 citation statements)

References 44 publications

(23 reference statements)

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“…4d), demonstrating the excellent resilience of 3D silane-b-RGO structures and recoverable stability of the conductive networks. These results show stable response of electrical resistance to cyclic compressive strain and excellent electromechanical sensitivity, enabling applications of these aerogels in flexible electronics, pressure sensors, etc [71].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 92%

Silane bonded graphene aerogels with tunable functionality and reversible compressibility

Guan

Gao

Pei

et al. 2016

Carbon

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 92%

Silane bonded graphene aerogels with tunable functionality and reversible compressibility

Guan

Gao

Pei

et al. 2016

Carbon

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“…The strength could be controlled by changing the polymer concentration. Overall, the initial sensitivity (0.572 kPa −1 ) of the GO‐AgNF‐PI sponge was two times greater than the maximum value (0.31 kPa −1 ) of resistance‐type GO sponges in literature . The operating stress range (0–10 kPa) was wide that can be further expanded by changing the polymer concentration.…”

Section: Introductionmentioning

confidence: 71%

“…However, the addition of polymers caused a decrease in electrical conductivity . The sensitivity, which is the normalized resistance change over pressure difference, was also low (maximum: 0.26 kPa −1 ) over a limited operation range when GO‐polymer sponges were employed as resistance‐type stress sensors in literature …”

Section: Introductionmentioning

confidence: 99%

Silver Nanoflower Decorated Graphene Oxide Sponges for Highly Sensitive Variable Stiffness Stress Sensors

Khan

Ajmal

Bae

et al. 2018

Small

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Soft conductive materials should enable large deformation while keeping high electrical conductivity and elasticity. The graphene oxide (GO)-based sponge is a potential candidate to endow large deformation. However, it typically exhibits low conductivity and elasticity. Here, the highly conductive and elastic sponge composed of GO, flower-shaped silver nanoparticles (AgNFs), and polyimide (GO-AgNF-PI sponge) are demonstrated. The average pore size and porosity are 114 µm and 94.7%, respectively. Ag NFs have thin petals (8-20 nm) protruding out of the surface of a spherical bud (300-350 nm) significantly enhancing the specific surface area (2.83 m g ). The electrical conductivity (0.306 S m at 0% strain) of the GO-AgNF-PI sponge is increased by more than an order of magnitude with the addition of Ag NFs. A nearly perfect elasticity is obtained over a wide compressive strain range (0-90%). The strain-dependent, nonlinear variation of Young's modulus of the sponge provides a unique opportunity as a variable stiffness stress sensor that operates over a wide stress range (0-10 kPa) with a high maximum sensitivity (0.572 kPa ). It allows grasping of a soft rose and a hard bottle, with the minimal object deformation, when attached on the finger of a robot gripper.

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“…To further improve the stability, graphene blended with elastic materials, such as PI [102], polystyrene (PS) [271], natural rubber [104,272] have been investigated for obtaining high-performance flexible sensors. Qin et al [102] mixed GO suspensions with PI precursors, and then carried out freeze-drying and thermal annealing processes to fabricate graphene/PI composites, which presented excellent flexibility, desirable piezoresistive property (Fig.…”

Section: Graphene-based Monoliths For Flexible Sensorsmentioning

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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Superelastic, Macroporous Polystyrene‐Mediated Graphene Aerogels for Active Pressure Sensing

Cited by 37 publications

References 44 publications

Silane bonded graphene aerogels with tunable functionality and reversible compressibility

Silane bonded graphene aerogels with tunable functionality and reversible compressibility

Silver Nanoflower Decorated Graphene Oxide Sponges for Highly Sensitive Variable Stiffness Stress Sensors

Advanced carbon materials for flexible and wearable sensors

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