Thermal transport across graphene step junctions

Miguel Munoz Rojo, Zuanyi Li, Charles Sievers, Alex C. Bornstein, Eilam Yalon, Sanchit Deshmukh, Sam Vaziri, Myung Ho Bae, Feng Xiong, Davide Donadio (Corresponding Author), Eric Pop

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Abstract

Step junctions are often present in layered materials, i.e. where single-layer regions meet multilayer regions, yet their effect on thermal transport is not understood to date. Here, we measure heat flow across graphene junctions (GJs) from monolayer-to-bilayer graphene, as well as bilayer to four-layer graphene for the first time, in both heat flow directions. The thermal conductance of the monolayer-bilayer GJ ranges from ∼0.5 to 9.1 × 108 W m-2 K-1 between 50 K to 300 K. Atomistic simulations of such a GJ device reveal that graphene layers are relatively decoupled, and the low thermal conductance of the device is determined by the resistance between the two distinct graphene layers. In these conditions the junction plays a negligible effect. To prove that the decoupling between layers controls thermal transport in the junction, the heat flow in both directions was measured, showing no evidence of thermal asymmetry or rectification, within experimental error bars. For large-area graphene applications, this signifies that small bilayer (or multilayer) islands have little or no contribution to overall thermal transport.

Original languageEnglish
Article number011005
Journal2D Materials
Volume6
Issue number1
Early online date12 Oct 2018
DOIs
Publication statusPublished - 2 Nov 2018

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Graphene
graphene
heat transmission
Heat transfer
Monolayers
Multilayers
Hot Temperature
rectification
decoupling
asymmetry

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Rojo, M. M., Li, Z., Sievers, C., Bornstein, A. C., Yalon, E., Deshmukh, S., ... Pop, E. (2018). Thermal transport across graphene step junctions. 2D Materials, 6(1), [011005]. https://doi.org/10.1088/2053-1583/aae7ea
Rojo, Miguel Munoz ; Li, Zuanyi ; Sievers, Charles ; Bornstein, Alex C. ; Yalon, Eilam ; Deshmukh, Sanchit ; Vaziri, Sam ; Bae, Myung Ho ; Xiong, Feng ; Donadio, Davide ; Pop, Eric. / Thermal transport across graphene step junctions. In: 2D Materials. 2018 ; Vol. 6, No. 1.
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Rojo, MM, Li, Z, Sievers, C, Bornstein, AC, Yalon, E, Deshmukh, S, Vaziri, S, Bae, MH, Xiong, F, Donadio, D & Pop, E 2018, 'Thermal transport across graphene step junctions' 2D Materials, vol. 6, no. 1, 011005. https://doi.org/10.1088/2053-1583/aae7ea

Thermal transport across graphene step junctions. / Rojo, Miguel Munoz; Li, Zuanyi; Sievers, Charles; Bornstein, Alex C.; Yalon, Eilam; Deshmukh, Sanchit; Vaziri, Sam; Bae, Myung Ho; Xiong, Feng; Donadio, Davide (Corresponding Author); Pop, Eric.

In: 2D Materials, Vol. 6, No. 1, 011005, 02.11.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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Rojo MM, Li Z, Sievers C, Bornstein AC, Yalon E, Deshmukh S et al. Thermal transport across graphene step junctions. 2D Materials. 2018 Nov 2;6(1). 011005. https://doi.org/10.1088/2053-1583/aae7ea