Porous GNP/PDMS composites with significantly reduced percolation threshold of conductive filler for stretchable strain sensors

Hu, Hailong; Ma, Yalun; Yue, Jianling; Zhang, Fan

doi:10.1016/j.coco.2021.101033

Cited by 21 publications

(11 citation statements)

References 34 publications

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“…Hu et al developed a porous structured GNP-PDMS sensor, in which a self-sacrificing templating method was employed to configurate the segregated conductive network. Their optimal sensor contained 5 wt.% GNP and achieved a GF of 17.5, between 0 and 10% levels [34]. Xu et al manufactured a GNP-based strain sensor using a cost-effective gap coating, which The state-of-the-art is shown in some previous work with strain sensors based on GNP.…”

Section: Cycling Test Monitoringmentioning

confidence: 99%

Wearable Sensors Based on Graphene Nanoplatelets Reinforced Polydimethylsiloxane for Human Motion Monitoring: Analysis of Crack Propagation and Cycling Load Monitoring

et al. 2022

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The use of graphene and other carbon nanoparticles is now of interest for developing chemical (gas and compounds detectors) and physical sensors. In this work, a graphene nanoplatelet (GNP)-PDMS sensor is proposed. More specifically, its strain-sensing capabilities under consecutive cycles as well as the crack propagation mechanisms are widely analyzed. First, an analysis of the electrical properties shows that the increase of the GNP content leads, as expected, to an increase of the electrical conductivity, ranging from values around 10−3 to 1 S/m for 5 and 11 wt.% samples. The analysis of crack propagation monitoring capabilities shows an exceptional sensitivity of the proposed flexible sensors, with a highly exponential behavior of the electrical resistance due to the prevalent breakage of the electrical pathways as crack propagation occurs. Furthermore, the analysis of the electrical response under cyclic load proves a very high robustness, with a similar response when comparing different cycles and an electrical sensitivity that increases when decreasing the GNP content (from 15–25 to 25–50 at 7 and 11 wt.% GNP content, respectively), a fact that is explained by the prevalence of tunneling mechanisms at low contents. Finally, a proof-of-concept of human motion monitoring by the detection of neck, wrist and facial movements is successfully achieved, indicating the high applicability of the proposed sensors.

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Section: Cycling Test Monitoringmentioning

confidence: 99%

Wearable Sensors Based on Graphene Nanoplatelets Reinforced Polydimethylsiloxane for Human Motion Monitoring: Analysis of Crack Propagation and Cycling Load Monitoring

et al. 2022

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“…Typically, at the percolation threshold, graphene forms a continuous network within the polymer matrix; further increases in loading have little effect on reducing resistivity. 44,45 This finding is confirmed by the fact that after 12 repeated impregnation− drying cycles, the sheet resistance of the composites remains essentially unchanged. After magnetic field induction, the establishment of conductive pathways between MGOs may not only occur parallel to the direction of the magnetic field.…”

Section: Oriented Conductive Luminescence Performance and Mechanism A...mentioning

confidence: 77%

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Zhi,

Xu,

et al. 2023

ACS Appl. Nano Mater.

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Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.

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“…Secondly, in region 1 (0–50%), the TCs-1 foam has the highest GF among TPU/CNT foams with various CNT contents, and GFs of porous TPU/CNT sensors decrease with increasing CNT contents above 1 wt%, because conductive networks of TPU/CNT foams approaching the percolation threshold tend to be separated under small structure deformation. 41 In region 2 (160–300%), the GF of porous TCs-1 is 0, while the GFs of TPU/CNT foams with CNT contents above 1 wt% are relatively high and increase with increasing CNT contents. This phenomenon originates from anisotropic pores and dense conductive networks.…”

Section: Resultsmentioning

confidence: 98%

Efficient fabrication of highly stretchable and ultrasensitive thermoplastic polyurethane/carbon nanotube foam with anisotropic pore structures for human motion monitoring

et al. 2023

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Porous GNP/PDMS composites with significantly reduced percolation threshold of conductive filler for stretchable strain sensors

Cited by 21 publications

References 34 publications

Wearable Sensors Based on Graphene Nanoplatelets Reinforced Polydimethylsiloxane for Human Motion Monitoring: Analysis of Crack Propagation and Cycling Load Monitoring

Wearable Sensors Based on Graphene Nanoplatelets Reinforced Polydimethylsiloxane for Human Motion Monitoring: Analysis of Crack Propagation and Cycling Load Monitoring

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Efficient fabrication of highly stretchable and ultrasensitive thermoplastic polyurethane/carbon nanotube foam with anisotropic pore structures for human motion monitoring

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