Electrical conductivity maps in graphene nanoplatelet/silicon nitride composites using conducting scanning force microscopy

Ramírez, Carlos; Garzón, Luis; Miranzo, P.; Osendi, M.I.; Ocal, Carmen

doi:10.1016/j.carbon.2011.05.025

Cited by 84 publications

(33 citation statements)

References 32 publications

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“…For the higher filler concentration, E 3 seems to level off (Fig. 3b), and most probably related to the formation of a fully contacted graphene network [8].…”

Section: Resultsmentioning

confidence: 98%

“…Nevertheless, not much attention has been paid to examine their elastic properties [5][6][7], which are fundamental for their structural performance. Actually, this performance can be particularly affected when a preferential orientation of the fillers occurs, such as it happens for graphene/ceramic composites fabricated by SPS [5,8]. It has been shown that the preferred orientation of the graphene layers induces anisotropy of the electrical and thermal properties of Si 3 N 4 /graphene composites [9,10] but also of their elastic constants [6].…”

Section: Introductionmentioning

confidence: 97%

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Elastic properties of silicon nitride ceramics reinforced with graphene nanofillers

et al. 2015

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“…For the higher filler concentration, E 3 seems to level off (Fig. 3b), and most probably related to the formation of a fully contacted graphene network [8].…”

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

Elastic properties of silicon nitride ceramics reinforced with graphene nanofillers

et al. 2015

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“…Both the electrical and mechanical anisotropy seem to increase with the GNP content. The increase in the electrical conductivity σ ⊥ is much higher than the increase in σ // (conductivity in the direction of the SPS compression axis) [8,16].…”

Section: Introductionmentioning

confidence: 89%

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

et al. 2018

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Abstract:The addition of graphene-based nanostructures (GBNs) can improve the inherent fragility of ceramics and provide them with improved electrical and thermal conductivities. However, both the starting material (ceramic matrix and GBNs) and the processing/sintering approach are crucial for the final composite microstructure and properties. This work focuses on the influence of the content and dimensions of the GBN filler (10 and 20 vol%; 3 and~150 layers), the powder-processing conditions (dry versus wet), and the homogenization method (ultrasound sonication versus high-energy planetary ball milling) on GBN/tetragonal zirconia (3YTZP) composites. The microstructure and electrical properties of the spark plasma sintered (SPS) composites were quantified and analyzed. The highest microstructural homogeneity with an isotropic microstructure was achieved by composites prepared with thicker GBNs milled in dry conditions. A high content (20 vol%) of few-layered graphene as a filler maximizes the electrical conductivity of the composites, although it hinders their densification.

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“…Various CMCs with highly oriented graphene-based laments were prepared by the spark plasma sintering (SPS) technique [68]. These composite materials exhibit, besides the expected improved fracture toughness, also signicant anisotropies in electric conductivity [6], thermal conductivity [7,9], elastic stiness and internal friction [10]. Recently, Nieto et al [11] reported on a bulk material consisting purely of the graphene nanoplatelets (GNPs) consolidated together by the SPS.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Elastic and Acoustic Properties of Bulk Graphene Nanoplatelets Consolidated by Spark Plasma Sintering

et al. 2015

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Elastic anisotropy and acoustic attenuation in bulk material consisting of consolidated graphene nanoplatelets are studied. The material was prepared by spark plasma sintering, and exhibits highly anisotropic microstructure with the graphene nanoplatelets oriented perpendicular to the spark plasma sintering compression axis. The complete tensor of elastic constants is obtained using a combination of two ultrasonic methods: the throughtransmission method and the resonant ultrasound spectroscopy. It is shown that the examined material exhibits very strong anisotropy both in the elasticity (the Young moduli in directions parallel to the graphene nanoplatelets and perpendicular to them dier by more than 20 times) and in the attenuation, where the dissipative eect of the internal friction in the graphene nanoplatelets combines with strong scattering losses due to the porosity. The results are compared with those obtained for ceramic-matrix/graphene nanoplatelet composites by the same ultrasonic methods.

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Electrical conductivity maps in graphene nanoplatelet/silicon nitride composites using conducting scanning force microscopy

Cited by 84 publications

References 32 publications

Elastic properties of silicon nitride ceramics reinforced with graphene nanofillers

Elastic properties of silicon nitride ceramics reinforced with graphene nanofillers

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

Anisotropic Elastic and Acoustic Properties of Bulk Graphene Nanoplatelets Consolidated by Spark Plasma Sintering

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