Thermal conductivity of carbon nanoring linked graphene sheets: A molecular dynamics investigation

Abstract

Improving the thermal conduction across graphene sheets is of great importance for their applications in thermal management. In this paper, thermal transport across a hybrid structure formed by two graphene nanoribbons and carbon nanorings (CNRs) was investigated by molecular dynamics simulations. The effects of linker diameter, number, and height on thermal conductivity of the CNRs-graphene hybrid structures were studied respectively, and the CNRs were found effective in transmitting the phonon modes of GNRs. The hybrid structure with 2 linkers showed the highest thermal conductivity of 68.8 W•m −1 •K −1 . Our work presents important insight into fundamental principles governing the thermal conduction across CNR junctions and provides useful guideline for designing CNR-graphene structure with superior thermal conductivity.

Carbon–Carbon Allotropic Hybrids and Composites: Synthesis, Properties, And Applications

“…Molecular dynamics simulations were applied to a hybrid structure (Figure 39), formed by CNRs and two graphene nanoribbons. 90 This composite with two linkers revealed a very high thermal conductivity of 68.8 W m −1 K −1 , being 11 times higher than this value for overlapped graphene sheets without CNRs. In these CNR-graphene hybrids, the density and the diameter of CNR are the most important parameters responsible for the thermal transport.…”

“…This graphene/CNR hybrid paper shows a good ability for heat spreading. Molecular dynamics simulations were applied to a hybrid structure (Figure ), formed by CNRs and two graphene nanoribbons . This composite with two linkers revealed a very high thermal conductivity of 68.8 W m –1 K –1 , being 11 times higher than this value for overlapped graphene sheets without CNRs.…”

“…(d) Schematic diagram of a CNR junction. Reprinted with permission from ref . Copyright 2017 IOP Science.…”

Multilayer graphene refractive index tuning by optical power

“…Single-layer graphene can be considered as a mix of a semiconductor (zero density of states) and a metal (gapless) with symmetric conical band structure, which leads to good tunable optical characteristics. [1][2][3][4][5][6] Conductivity and refractive index (RI) are two important and useful optical parameters for accurately describing the optical characteristics of the graphene, and can be deduced each other. [7][8][9] Therefore, a lot of researches have focused on the measurement and calculation of conductivity or RI of graphene.…”