Thermal conductivity and thermal rectification in graphene nanoribbons: a molecular dynamics study.
By Jiuning Hu, X. Ruan, Yong P. Chen. Nano letters (Print), 2009
724 citations recorded by the source corpus.
We have used molecular dynamics to calculate the thermal conductivity of symmetric and asymmetric graphene nanoribbons (GNRs) of several nanometers in size (up to approximately 4 nm wide and approximately 10 nm long). For symmetric nanoribbons, the calculated thermal conductivity (e.g., approximately 2000 W/m-K at 400 K for a 1.5 nm x 5.7 nm zigzag GNR) is on the similar order of magnitude of the experimentally measured value for graphene. We have investigated the effects of edge chirality and found that nanoribbons with zigzag edges have appreciably larger thermal conductivity than nanoribbons with armchair edges. For asymmetric nanoribbons, we have found significant thermal rectification. Among various triangularly shaped GNRs we investigated, the GNR with armchair bottom edge and a vertex angle of 30 degrees gives the maximal thermal rectification. We also studied the effect of defects and found that vacancies and edge roughness in the nanoribbons can significantly decrease the thermal conductivity. However, substantial thermal rectification is observed even in the presence of edge roughness.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/baadbfeaebbc123322bc777e897927f0ab1d4972
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Citations in the corpus
- Colloquium : Phononics: Manipulating heat flow with electronic analogs and beyond (2011, background): “Similar rectification features were observed in graphene nanoribbons by Hu et al. (2009).”
- Colloquium: Phononic thermal properties of two-dimensional materials (2017, background): “…dependence (which is regarded as a sign of strong umklapp phonon-phonon scattering), the thermal conductivity of graphene nanoribbons shows a different trend, where thermal conductivity linearly increases or remains almost unchanged with temperature (Hu, Ruan, and Chen, 2009; Xie et al., 2013).”