Thermal Conductivity of Copper-Graphene Composite Films Synthesized by Electrochemical Deposition with Exfoliated Graphene Platelets

Jagannadham, K.

doi:10.1007/s11663-011-9597-z

Cited by 150 publications

(65 citation statements)

References 34 publications

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“…(Ref [1][2][3][4][5][6]. While some enhancement of thermal properties of MMCs with carbon nanotubes seem to be attainable (Ref 7), a large-scale manufacturing of graphene reinforced MMCs is accompanied by still difficult-to-overcome problems, mainly related with the occurrence of the agglomeration of graphene phase due to electrostatic forces (Ref 8) and a weak interfacial bonding between the graphene flakes and metal matrix (Ref 9).…”

Section: Introductionmentioning

confidence: 99%

Interaction Between Graphene-Coated SiC Single Crystal and Liquid Copper

Homa

Sobczak

et al. 2018

J. of Materi Eng and Perform

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The wettability of graphene-coated SiC single crystal (C Gn /SiC sc ) by liquid Cu (99.99%) was investigated by a sessile drop method in vacuum conditions at temperature of 1100°C. The graphene layer was produced via a chemical vapor deposition routine using 4H-SiC single crystal cut out from 6¢¢ wafer. A dispensed drop technique combined with a non-contact heating of a couple of materials was applied. The Cu drop was squeezed from a graphite capillary and deposited on the substrate directly in a vacuum chamber. The first Cu drop did not wet the C Gn /SiC sc substrate and showed a lack of adhesion to the substrate: the falling Cu drop only touched the substrate forming a contact angle of h 0 = 121°and then immediately rolled like a ball along the substrate surface. After settling near the edge of the substrate in about 0.15 s, the Cu drop formed an asymmetric shape with the right and left contact angles of different values (h R = 86°and h L = 70°, respectively), while in the next 30 min, h R and h L achieved the same final value of $ 52°. The second Cu drop was put down on the displacement path of the first drop, and immediately after the deposition, it also did not wet the substrate (h = 123°). This drop kept symmetry and the primary position, but its wetting behavior was unusual: both h R and h L decreased in 17 min to the value of 23°and next, they increased to a final value of 65°. Visual observations revealed a presence of $ 2.5-mm-thick interfacial phase layer reactively formed under the second drop. Scanning electron microscopy (SEM) investigations revealed the presence of carbon-enriched precipitates on the top surface of the first Cu drop. These precipitates were identified by the Raman spectroscopy as double-layer graphene. The Raman spectrum taken from the substrate far from the drop revealed the presence of graphene, while that obtained from the first drop displacement path exhibited a decreased intensity of 2D peak. The results of SEM investigations and Raman spectroscopy studies suggest that the presence of graphene layer on the SiC substrate suppresses but does not completely prevent chemical interaction between liquid Cu drop and SiC. Both chemical degradation (etching) and mechanical degradation of the graphene layer during drop rolling due to high adhesion of the Cu drop to the SiC substrate are responsible for mass transfer through the 2nd drop/substrate interface that in turn results in significant changes of structure and chemistry of the drop and the interface.

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Section: Introductionmentioning

confidence: 99%

Interaction Between Graphene-Coated SiC Single Crystal and Liquid Copper

Homa

Sobczak

et al. 2018

J. of Materi Eng and Perform

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“…The results are shown in Figure 1. Peaks associated with graphene film in the sample are not strong enough to be recorded when it is thin because of the lower atomic mass [16][17][18] of carbon. However, peaks associated with several layers of graphene or graphite are found.…”

Section: Resultsmentioning

confidence: 99%

“…Thinner graphene platelets are not easily imaged even in backscattering mode as the signal from the graphene is very weak. [17,18] A higher magnification SEM image of the side surface of the sample collected after polishing is presented in Figure 5. The SEM image is collected in backscattering mode to show graphene platelets and voids.…”

Section: B Scanning Electron Microscopymentioning

confidence: 99%

Thermal Conductivity Changes in Titanium-Graphene Composite upon Annealing

Jagannadham

2015

Metall Mater Trans A

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KASICHAINULA JAGANNADHAMTi-graphene composite films were prepared on polished Ti substrates by deposition of graphene platelets from suspension followed by deposition of Ti by magnetron sputtering. The films were annealed at different temperatures up to 1073 K (800°C) and different time periods in argon atmosphere. The annealed films were characterized by X-ray diffraction for phase identification, scanning electron microscopy for microstructure, energy-dispersive spectrometry for chemical analysis, atomic force microscopy for surface roughness, and transient thermoreflectance for thermal conductivity and interface thermal conductance. The results showed that the interface between the composite film and Ti substrate remained continuous with the absence of voids. Oxygen concentration in the composite films has increased for higher temperature and time of annealing. TiO 2 and TiC phases are formed only in the film annealed at 1073 K (800°C). The thermal conductivity of the composite film decreased with increasing oxygen concentration. The effective thermal conductance of the film annealed at 1073 K (800°C) was significantly lower. The interface thermal conductance between the composite film and the Ti substrate is also reduced for higher oxygen concentration. Formation of microscopic TiO 2 phase bound by interface boundaries and oxygen incorporation is considered responsible for the lower thermal conductance of the Ti-graphene composite annealed at 1073 K (800°C).

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“…One group of very popular materials, which appeared in numerous studies, is represented by carbon materials such as graphene (C Gn ) or carbon nanotubes (CNTs). In recent years, graphene has become a popular reinforcement material for metal matrix composites (Ref [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Cu-Matrix Composites Manufactured Using Cu Powder Coated with Graphene

Babul

Baranowski

Sobczak

et al. 2016

J. of Materi Eng and Perform

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Compact Cu matrix composites reinforced with graphene were prepared by thermochemical processes and cold isostatic pressing. Thermophysical properties were investigated using laser flash analysis, differential scanning calorimetry, and dilatometry. From the results of the measurements, it follows that within the entire investigated temperature range, both the thermal diffusivity and the calculated values therefrom of the thermal conductivity of copper-graphene composites change according to the temperature changes. Above 500°C, abnormal decrease of the thermal diffusivity was registered for sample prepared from pure copper powder. In this case, the elevated temperature of test could cause sintering of copper particles, which were not coated by graphene. The as-received composites had higher thermal diffusivity and the thermal conductivity at the room temperature in comparison to the material obtained by standard pressing of pure copper powder. However, the production methods of some samples could cause their partial sintering. Based on the study, it could not be concluded that graphene only has impacts on the thermophysical properties.

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Thermal Conductivity of Copper-Graphene Composite Films Synthesized by Electrochemical Deposition with Exfoliated Graphene Platelets

Cited by 150 publications

References 34 publications

Interaction Between Graphene-Coated SiC Single Crystal and Liquid Copper

Interaction Between Graphene-Coated SiC Single Crystal and Liquid Copper

Thermal Conductivity Changes in Titanium-Graphene Composite upon Annealing

Thermophysical Properties of Cu-Matrix Composites Manufactured Using Cu Powder Coated with Graphene

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