Graphene-multilayer graphene nanocomposites as highly efficient thermal interface materials.

By K. Shahil, Alexander A. Balandin. Nano letters (Print), 2012

1,373 citations recorded by the source corpus.

We found that the optimized mixture of graphene and multilayer graphene, produced by the high-yield inexpensive liquid-phase-exfoliation technique, can lead to an extremely strong enhancement of the cross-plane thermal conductivity K of the composite. The "laser flash" measurements revealed a record-high enhancement of K by 2300% in the graphene-based polymer at the filler loading fraction f = 10 vol %. It was determined that the relatively high concentration of the single-layer and bilayer graphene flakes (~10-15%) present simultaneously with the thicker multilayers of large lateral size (~1 μm) were essential for the observed unusual K enhancement. The thermal conductivity of the commercial thermal grease was increased from an initial value of ~5.8 W/mK to K = 14 W/mK at the small loading f = 2%, which preserved all mechanical properties of the hybrid. Our modeling results suggest that graphene-multilayer graphene nanocomposite used as the thermal interface material outperforms those with carbon nanotubes or metal nanoparticles owing to graphene's aspect ratio and lower Kapitza resistance at the graphene-matrix interface.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/207350cc69a760c2371d09c0c880601a0f42d0ab

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In Materials Chemistry

1. J. Renteria
2. Denis L. Nika
3. Alexander A. Balandin
4. Bohayra Mortazavi
5. Ning Hu
6. C. Wong
7. Xi Shen
8. Cheng Yan

Citations in the corpus

• Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications (2018, background): “Finally, GnPs showed good potential for enhancing the thermal conductivity of polymer matrixes [46], making them suitable as thermal interface materials [39,47].”
• Enhanced thermal conductivity in polymer composites with aligned graphene nanosheets (2014, background): “Despite the tremendous efforts made to improve the desperation and interfacial adhesion of GNSs in the polymer matrix, the thermal conductivity value is still far below the theoretical predictions [1, 7].”
• Surface functionalization of few-layer black phosphorene and its flame retardancy in epoxy resin (2020, background): “Filler efficiency is often used to characterize the contribution of a unit weight of filler to material properties [52].”
• Thermal management of lithium ion batteries using graphene coated nickel foam saturated with phase change materials (2018, background): “Graphene based composites have superior mechanical properties over the composite itself [31] and have a low coefficient of thermal expansion [32,33].”
• Exfoliated hexagonal boron nitride-based polymer nanocomposite with enhanced thermal conductivity for electronic encapsulation (2014, background): “prepared multilayer graphene–epoxy nanocomposite, which achieved a high enhancement of thermal conductivity by 2300% at a filler loading of 10 vol% [15].”
• Effect of Functionalization on Thermal Conductivities of Graphene/Epoxy Composites (2016, background): “[7] The TC of suspended graphene sheet depends on its length [24] due to the long phonon mean free path.”