Mechanism of thermal conductivity reduction in few-layer graphene

By Dhruv P Singh, Jayathi Y. Murthy, Timothy S. Fisher. 2011

155 citations recorded by the source corpus.

Using the linearized Boltzmann transport equation and perturbation theory, we analyze the reduction in the intrinsic thermal conductivity of few-layer graphene sheets accounting for all possible three-phonon scattering events. Even with weak coupling between layers, a significant reduction in the thermal conductivity of the out-of-plane acoustic modes is apparent. The main effect of this weak coupling is to open many new three-phonon scattering channels that are otherwise absent in graphene. However, reflection symmetry is only weakly broken with the addition of multiple layers, and out-of-plane acoustic phonons still dominate thermal conductivity. We also find that reduction in thermal conductivity is mainly caused by lower contributions of the higher-order overtones of the fundamental out-of-plane acoustic mode. The results compare remarkably well over the entire temperature range with measurements of graphene and graphite.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/0e0edb54494416cb1b70dbafcbb64ad189e89780

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Citations in the corpus

Graphene versus MoS2: A short review (2014, background): “In the out-of-plane direction, the thermal conductivity for graphene decreases with increasing layer number as there are more phononphonon scattering channels in thicker few-layer graphene [138, 142–149].”
Graphene Thermal Properties: Applications in Thermal Management and Energy Storage (2014, background): “Some researchers argued that LA and TA phonons carry most of the heat in suspended graphene [41–43,49,72,84,85], while others suggested that ZA modes are dominate heat carriers [37,54,55,60,96].”
Colloquium: Phononic thermal properties of two-dimensional materials (2017, methodology): “The theoretical studies using both NEMD (Z. Wei et al., 2011) and PBTE (Lindsay, Broido, and Mingo, 2011; Singh, Murthy, and Fisher, 2011; Kuang, Lindsay, and Huang, 2015) confirmed that singlelayer graphene has a much higher thermal conductivity than that of graphite.”