Enhanced Mechanical Properties of Graphene/Copper Nanocomposites Using a Molecular‐Level Mixing Process

Hwang, Jong‐Yeon; Yoon, Taeshik; Jin, Sung Hwan; Lee, Jinsup; Kim, Taek‐Soo; Hong, Soon Hyung; Jeon, Seokwoo

doi:10.1002/adma.201302495

Cited by 636 publications

(316 citation statements)

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“…Many previous studies have focused on designing and fabricating new graphene reinforced metal matrix composites, including aluminum [7][8][9], copper [10,11], magnesium [12], and nickel matrix composites [13,14]. In most cases, it was observed that the mechanical properties were significantly enhanced, even with the addition of a very small amount of graphene.…”

Section: Introductionmentioning

confidence: 99%

“…The tensile strength of a 0.3 wt % graphene nanosheet (GNS)-reinforced Al composite increased by 62% compared with that of the unreinforced matrix [9]. The elastic modulus and yield strength of graphene/copper nanocomposites containing 2.5 vol % reduced graphene oxide were 131 GPa and 284 MPa, which were 1.3 and 1.8 times higher, respectively, compared with those of pure Cu [11]. Kim et al synthesized a metal-graphene nanolayered composite and found that the addition of GNS resulted in an ultra-high strength of 4.0 GPa for a graphene/nickel composite [14].…”

Section: Introductionmentioning

confidence: 99%

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Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

et al. 2018

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Abstract:Graphene is an ideal reinforcement material for metal-matrix composites owing to its exceptional mechanical properties. However, as a 2D layered material, graphene shows highly anisotropic behavior, which greatly affects the mechanical properties of graphene-based composites. In this study, the interaction between an edge dislocation (b = 1/2 (111)) and a pair of graphene nanosheets (GNSs) in GNS reinforced iron matrix composite (GNS/Fe) was investigated using molecular dynamic simulations under simple shearing conditions. We studied the cases wherein the GNS pair was parallel to the (110), (112), and (111) planes, respectively. The results showed that the GNS reinforcement can effectively hinder dislocation motion, which improves the yield strength. The interaction between the edge dislocation and the GNS pair parallel to the (112) plane showed the strongest effect of blocking dislocations among the three cases, resulting in increases in the shear modulus and yield stress of 107% and 1400%, respectively. This remarkable enhancement was attributed to the Orowan "by-passing" strengthening mechanism, whereas cross-slip of dislocation segments was observed during looping around GNSs. Our results might contribute to the development of high-strength iron matrix composites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

et al. 2018

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“…Because the graphene was uniformly dispersed in the solution, it would be the nucleating agent and Cu OH 2 would be adsorbed onto the monolayer grapheme [7], thereby CuO/graphene composites were formed. After standing, the precipitate was filtered, washed and dried to obtain a dried CuO/graphene composite.…”

Section: Gcmm Matecconf/201 4010mentioning

confidence: 99%

Study on Graphene Reinforced Copper Contact Material

Song

2017

MATEC Web Conf.

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Abstract. Cu is widely used to contact materials because of its excellent electrical conductivity and economical efficiency, but its high temperature strength is slightly insufficient. In this paper, the less layers of graphene oxide were dispersed in deionized water by ultrasonic treatment, then copper acetate aqueous solution was added to the graphene oxide suspension with mixing. Then add NaOH aqueous solution into the blend solution. With graphene as a substratum, Cu (OH)2 precipitations were generated so that a molecular level dispersion can be achieved. The precipitations were isolated by filtering, rinsing and drying, and then, these powders were reduced at 400 under a hydrogen atmosphere to form the homogeneously dispersed Cu/graphene composite powders. Sinter powders by spark plasma sintered and we obtained Cu contact materials strengthened by graphene. Under the sintering pressure of 250 Mpa, the hardness of Cu/graphene composite was 171.4 HV, which was 4.3 times than that of annealed copper; the electrical conductivity of Cu/graphene only decreased 5% and can still meet the contact demand.

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“…In biomedical field, graphene have been utilized as scaffolding in tissue engineering, as an internal component of power unit for biomedical devices, in drug delivery and cancer therapy and in biosensors, due to its ultra-high sensitivity, unique morphological characteristics and strong mechanical properties. The unique monoatomic structure of graphene offers remarkable physical properties such as high mechanical strength with 1 TPa Young's Modulus and 130 G Pa tensile strength for single graphene layer (Hwang et al 2013), high transparency of 97.7% for single layer, high conductivity and high carrier mobilities up to 10 5 cm 2 V -1 s -1 , which is 2-3 orders of magnitude higher than the conventional semiconductor such as silicon (Hwang et al 2013). These excellent physical properties are advantageous in biomedical applications, particularly in tissue engineering, where graphene is utilized as a scaffolds for tissue growth (Goenka et al 2014).…”

Section: Introductionmentioning

confidence: 99%