Thermally and electrically conductive multifunctional sensor based on epoxy/graphene composite

Han, Sensen; Chand, Aron; Araby, Sherif; Cai, Rui; Chen, Shuo; Kang, Hailan; Cheng, Rongqiang; Meng, Qingshi

doi:10.1088/1361-6528/ab5042

Cited by 73 publications

(62 citation statements)

References 59 publications

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“…Graphene has attracted a great attention for fabrication of flexible electronics devices/sensors because of its outstanding properties such as ultra‐high toughness, high elasticity, high electron mobility, and transparency and high electrical conductivity . Compared with CNTs, graphene provide lower cost in fabrication in the epoxy composites .…”

Section: Introductionmentioning

confidence: 99%

A highly flexible, electrically conductive, and mechanically robust graphene/epoxy composite film for its self‐damage detection

Meng

Kenelak

Chand

et al. 2020

J of Applied Polymer Sci

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Advanced functional composites have attracted a great attention for fabricating flexible devices. In this article, the GnP/epoxy composite film was prepared by mixing graphene platelets (GnPs) with epoxy through sonication process. The morphology, mechanical properties, and electrical conductivity of the prepared composites were investigated. As the GnP contents increased from 2.5 to 7.5 vol%, the composites showed an increase in strain sensitivity with the rapid decrease in the strain gauge to 4.4. Additionally, when dynamic movement of the flexible film was performed, at bending and twist angle of 135° and 180°, respectively, steady increase in both resistance changes were detected and compared. The electrical resistance of the flexible was measured over a temperature range of 20–95°C, an increase in temperature lead to a linearly equivalent increase in resistance. The composites can also detect slight pressure changes at 2 kPa compression force with rapid decrease of resistance. Additionally, fatigue test was performed with stable, sensitive, and no distinguishable reading under 2,000 stretching cycles. The composite film exhibits an excellent self‐sensing responds when fracture occurred. Thus, the obtained highly flexible, conductive, and mechanical robust composite sensor can be applied as advanced composites sensors for health monitoring.

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Section: Introductionmentioning

confidence: 99%

A highly flexible, electrically conductive, and mechanically robust graphene/epoxy composite film for its self‐damage detection

Meng

Kenelak

Chand

et al. 2020

J of Applied Polymer Sci

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“…Preparation of GnPs is described elsewhere. 40 Briefly, 0.1 g GIC was heat-treated in a furnace at 700 C for 1 min to induce a thermal shock effect which assisted the subsequent exfoliation. The expanded product was cooled and then dispersed in acetone using ultrasonication for 2 h below 20 C (low temperature assisting the exfoliation process).…”

Section: Preparationmentioning

confidence: 99%

“…Preparation of GnPs is described elsewhere 40 . Briefly, 0.1 g GIC was heat‐treated in a furnace at 700°C for 1 min to induce a thermal shock effect which assisted the subsequent exfoliation.…”

Section: Experiments Detailsmentioning

confidence: 99%

Graphene/nanorubber reinforced electrically conductive epoxy composites with enhanced toughness

Wang

Xue

Guo

et al. 2020

J of Applied Polymer Sci

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Graphene platelets (electrically conductive 2D filler) and rubber nanoparticles (0D soft filler) can work together to develop electrically conductive and toughened epoxy composite adhesives. In this study, complementing effect between graphene platelets (GnPs) and rubber nanoparticles (RnPs) within an epoxy matrix is reported. In the 3-phase composite adhesive, the 2D graphene platelets form global conductive network and rubber nanoparticles provide a viscoelastic phase inside the epoxy, both complementing each other to develop electrically conductive and toughened epoxy composite adhesives. Fracture toughness (K 1c) and critical strain energy release rate (G 1c) of the epoxy were augmented by 422% and 872%, respectively by adding 1 wt% RnPs and it recorded electrical percolation threshold at 0.78 vol% GnP. Also, the Young's modulus and strength of epoxy/1 wt% RnP composite were promoted from 1.57 to 2.32 GPa when 1 wt% GnP is added. Scanning electron microscopy analysis was conducted to investigate the toughening mechanism of epoxy/RnP/GnP and epoxy/GnP composites. Lap shear strength tests on epoxy composite adhesives confirm the reinforcement effect of GnPs and toughness effect of RnPs.

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“…For the purpose of dissipating thermal heat from these devices, materials with enhanced thermal conductivity are strongly recommended 28 . There are publications of nanocomposites based on electrical conductive materials/polymer for thermal conduction 29 – 32 , yet the exposure of electrical conductive materials of electronics and electrical devices may cause the contamination and corrosion, and even the risk of electric shock. Hence, encapsulation with electrical insulating materials is the necessary prerequisite.…”

Section: Introductionmentioning

confidence: 99%

A high performance wearable strain sensor with advanced thermal management for motion monitoring

et al. 2020

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Resistance change under mechanical stimuli arouses mass operational heat, damaging the performance, lifetime, and reliability of stretchable electronic devices, therefore rapid thermal heat dissipating is necessary. Here we report a stretchable strain sensor with outstanding thermal management. Besides a high stretchability and sensitivity testified by human motion monitoring, as well as long-term durability, an enhanced thermal conductivity from the casted thermoplastic polyurethane-boron nitride nanosheets layer helps rapid heat transmission to the environments, while the porous electrospun fibrous thermoplastic polyurethane membrane leads to thermal insulation. A 32% drop of the real time saturated temperature is achieved. For the first time we in-situ investigated the dynamic operational temperature fluctuation of stretchable electronics under repeating stretching-releasing processes. Finally, cytotoxicity test confirms that the nanofillers are tightly restricted in the nanocomposites, making it harmless to human health. All the results prove it an excellent candidate for the next-generation of wearable devices.

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Thermally and electrically conductive multifunctional sensor based on epoxy/graphene composite

Abstract: This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.

Cited by 73 publications

References 59 publications

A highly flexible, electrically conductive, and mechanically robust graphene/epoxy composite film for its self‐damage detection

A highly flexible, electrically conductive, and mechanically robust graphene/epoxy composite film for its self‐damage detection

Graphene/nanorubber reinforced electrically conductive epoxy composites with enhanced toughness

A high performance wearable strain sensor with advanced thermal management for motion monitoring

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