Specifics of Thermal Transport in Graphene Composites: Effect of Lateral Dimensions of Graphene Fillers

Sudhindra, Sriharsha; Rashvand, Farnia; Wright, Dylan; Barani, Zahra; Drozdov, Aleksey D.; Baraghani, Saba; Backes, Claudia; Kargar, Fariborz; Balandin, Alexander A.

doi:10.1021/acsami.1c15346

Cited by 27 publications

(28 citation statements)

References 97 publications

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“…Due to the weaker sepiolite network, GNPs of H-25 might tend to "wrinkle" more, leading to internal strains and effective particle length reduction and thus potentially reducing their thermal conduction capability. 36 Larger lateral size GNPs dictate higher intrinsic TC, as supported by theoretical calculations, simulations, and experimental evidence: 18,37 it was suggested that with increasing lateral size of graphene, a higher amount of lowfrequency acoustic phonons is excitable, thus enhancing its intrinsic TC. 17,18 However, the highest TC enhancement and TC efficiency were measured for GNPs with the smaller MLD (H-15 GNP) for both base fluids (Figure 5).…”

Section: Resultsmentioning

confidence: 88%

Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions

Cullari

Schleifer

Kogan

et al. 2022

ACS Appl. Mater. Interfaces

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Carbon allotropes of different dimensionality, i.e., 1D-carbon nanotubes, 2D-graphene nanoplatelets, and 3D-graphite, possess high thermal conductivity (TC > 2000 W/m K). They are, therefore, excellent candidates for filler material aiming at increasing the TC of composites used for thermal management. However, preparing aqueous dispersions of these materials is challenging due to their strong van der Waals attraction, leading to aggregation and subsequent precipitation. Reported dispersion methodologies have failed to disperse large microscale fillers, which are essential for efficient thermal management. In this work, we suggest to “kinetically arrest” the dispersion by using sepiolite, a fiberlike clay, that effectively disperses all three carbon dimensionalities. We explore the effect of filler dimensionality and properties (lateral size, thickness, defect density) on the dispersion TC enhancement. Modeling the TC by the effective medium approach allows lumping all the intrinsic properties of the filler into a single parameter termed “effective TC”, providing an accurate prediction of the experimentally measured TC. We show that, by judicious choice of filler, the TC of both water and a water–ethylene glycol mixture can be enhanced by 31% using graphene nanoplatelets of 15 μm in lateral size. We believe that the guidelines obtained in this work provide a useful tool for designing future liquid composites with enhanced thermal properties.

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Section: Resultsmentioning

confidence: 88%

Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions

Cullari

Schleifer

Kogan

et al. 2022

ACS Appl. Mater. Interfaces

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“…As shown in Figure 2c,d, we can find that the flakes of graphene are large and lateral dimensions are above 10 μm through AFM, which has a great influence on TC and anisotropy. 50 At the same time, we measured the thickness of the graphene to calculate the number of graphene layers and randomly selected 100 graphene flakes for the AFM height profile analysis. The statistical results are shown in Figure 2e, and it can be found that about 92% of the graphene flakes were less than 10 layers.…”

Section: Resultsmentioning

confidence: 99%

Graphene/Copper Nanoparticles as Thermal Interface Materials

Sun

Liu

You

et al. 2022

ACS Appl. Nano Mater.

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Recently, graphene was extensively applied in the fields of electronic and thermal management for its extraordinary thermal conductivity (TC). The graphene prepared by venturi-assisted supercritical CO2 (scCO2) exfoliation has lots of advantages such as high quality, few defects, and extremely high in-plane TC and is usually used as thermal interface material (TIM). However, it was difficult to meet the development of three-dimensional integration due to the thermal anisotropy. Herein, we successfully introduced copper nanoparticles into graphene sheets to prepare the graphene nanocopper (Gr/Cu) composites with highly aligned graphene nanoplatelet by a vacuum filtration method. The unique structure of copper nanoparticles can significantly weaken the thermal anisotropy by providing a heat transfer channel for the graphene nanoplatelet. Experimental results revealed that through-plane thermal conductivity of Gr/Cu composites was increased by 2.05 times (5.22 W m–1 K–1) with 20 wt % copper nanoparticles doping and the thermal anisotropy decreased from 247 to 45, which means that there is great potential for TIMs.

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“…fabricated composite materials with different graphene loadings based on mineral oil. [ 184 ] The κ value reached 7.1 W m –1 K –1 , which showed superiority over some commercial products. They also investigated the relationship between thermal contact resistance and graphene loading.…”

Section: The Development In 2d Materials For Thermal Dissipation Appl...mentioning

confidence: 96%

High Thermal Conductivity 2D Materials: From Theory and Engineering to Applications

Tian

Shen

et al. 2022

Adv Materials Inter

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The channel/gate length of transistors is getting close to the physical limit. [1] To meet the requirements of chip performance, advanced design technologies are utilized to bring higher Transistors are getting close to their physical limitation, and complex chip design technologies have made the hotspot problem more serious. Graphene and hBN, as representative 2D semi-metal and dielectric materials, possess excellent thermal conductivities. Intrinsic 2D materials, 2D film materials, and 2D composite materials have been investigated, showing great potential for next-generation thermal-management materials. There are products that have already been commercialized based on graphene and hBN, but many companies seem to be sitting on the fence, and the obstacles toward implementation of these materials need to be specified. Here, high thermal conductivity 2D materials from theory and engineering to applications are reviewed, aiming to provide a comprehensive summary of the current state of the art of this field in order to give an overview and future prospects in application, manufacturing, and commercialization. From the theoretical perspective, the impact factors and development path of 2D materials for thermal dissipation and the engineering aspect of structural design are presented. The prospects and challenges are also tackled, expressing an objective view about future opportunities to build 2D-based heat-dissipation systems.

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Specifics of Thermal Transport in Graphene Composites: Effect of Lateral Dimensions of Graphene Fillers

Cited by 27 publications

References 97 publications

Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions

Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions

Graphene/Copper Nanoparticles as Thermal Interface Materials

High Thermal Conductivity 2D Materials: From Theory and Engineering to Applications

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