Dimensional crossover of thermal transport in few-layer graphene.
By Suchismita Ghosh, Wenzhong Bao, Denis L. Nika, S. Subrina, E. P. Pokatilov, C. N. Lau, Alexander A. Balandin. Nature Materials, 2010
1,315 citations recorded by the source corpus.
Graphene, in addition to its unique electronic and optical properties, reveals unusually high thermal conductivity. The fact that the thermal conductivity of large enough graphene sheets should be higher than that of basal planes of bulk graphite was predicted theoretically by Klemens. However, the exact mechanisms behind the drastic alteration of a material's intrinsic ability to conduct heat as its dimensionality changes from two to three dimensions remain elusive. The recent availability of high-quality few-layer graphene (FLG) materials allowed us to study dimensional crossover experimentally. Here we show that the room-temperature thermal conductivity changes from approximately 2,800 to approximately 1,300 W m(-1) K(-1) as the number of atomic planes in FLG increases from 2 to 4. We explained the observed evolution from two dimensions to bulk by the cross-plane coupling of the low-energy phonons and changes in the phonon Umklapp scattering. The obtained results shed light on heat conduction in low-dimensional materials and may open up FLG applications in thermal management of nanoelectronics.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/cc077e148a075cd45f3ce973c8a829d238e53db1
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In Materials Chemistry
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Citations in the corpus
- Thermal conductivity of isotopically modified graphene. (2011, methodology): “The thermal conductivity K of the suspended isotopically modified graphene layers was measured by the non-contact optothermal Raman technique [3-7, 10, 25].”
- Two-Dimensional Materials for Thermal Management Applications (2018, methodology): “Thickness-dependent thermal conductivity of suspended graphene was first reported by Ghosh et al.(86) using the optothermal Ramanmethod, and the results show a drop from 2,800 to 1,300 W m 1 K 1 as the number of graphene layers increases from 2 to 4.”