Reduction of phonon thermal conduction in isotopic graphene nanoribbon superlattices

Xie, Zili; Chen, Xue-Kun; Xia, Yu; Zhang, Yong; Wang, Haibin; Zhang, Lifu

doi:10.1007/s11433-017-9080-0

Cited by 17 publications

(9 citation statements)

References 22 publications

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“…The authors also found a dependence on the direction, i.e. 12 C to 13 C vs. 13 C to 12 C. Similar results were found for systems composed of graphene-hBN SLs [28] and 12 C-24 C nanoribbons [29]. With additional isotope impurities on top of the SL structure the thermal conductivity was shown to be further reduced [30] Here we report the thermal conductivity measurements of graphene monocrystals synthesized by chemical vapor deposition with an artificial isotope SL with periods L s ranging from 46 to 225 nm.…”

Section: Introductionsupporting

confidence: 67%

Thermal conductivity of graphene isotope superlattices

Whiteway¹,

Hilke²

2020

Preprint

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Graphene has a high intrinsic thermal conductivity and a high electron mobility. The thermal conductivity of graphene can be significantly reduced when different carbon isotopes are mixed, which can enhance the performance of thermoelectric devices. Here we compare the thermal conductivities of isotopic 12 C/ 13 C random mixes with isotope superlattices with periods ranging from 46 to 225 nm. Raman Opto-Thermal conductivity measurements of these superlattice structures show an approximately 50% reduction in thermal conductivity compared to pristine 12 C graphene. This average reduction is similar to the random isotope mix. The reduction of the thermal conductivity in the superlattice is well described by a model of pristine graphene and an additional quasi-one dimensional periodic interfacial thermal resistance of (2.5 ± 0.5)×10 −11 m 2 K/W for the 12 C/ 13 C boundary. This is consistent with a large anisotropic thermal conductivity in the superlattice, where the thermal conductivity depends on the orientation of the 12 C/ 13 C boundary.

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Section: Introductionsupporting

confidence: 67%

Thermal conductivity of graphene isotope superlattices

Whiteway¹,

Hilke²

2020

Preprint

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“…These behaviors have also been found in other superlattice systems. 25,27,41 From Fig. 5 and 7, we also found that, at the same 30 Si doping concentration of 50%, superlattice-structured doping (for l ¼ 6 nm in L ¼ 40 nm SNT) can reduce thermal conductivity more largely than randomly doping does.…”

Section: Methodsmentioning

confidence: 72%

Phonon thermal conductivity reduction in silicene nanotubes with isotope substitution

Zhou

2020

RSC Adv.

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“…18 This behaviour has been observed in experimental studies of three dimensional systems [21][22][23][24][25] and reported in MD 19,[26][27][28] and NEGF 15 studies of graphene isotope superlattices and other 2D systems. 29,30 This is yet to be experimentally verified in 2D materials due to the difficulty in synthesizing periodic superlattices at relevant length scales.…”

Section: Introductionmentioning

confidence: 99%

Graphene Isotope Superlattices with Strongly Diminished Thermal Conductivity for Thermoelectric Applications

Whiteway

Lee

Hilke

2020

ACS Appl. Nano Mater.

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Graphene has a high intrinsic thermal conductivity and a high electron mobility. The thermal conductivity of graphene can be significantly reduced when different carbon isotopes are mixed, which can enhance the performance of thermoelectric devices. Here we synthesize isotopic 12 C/ 13 C random mixes and isotope superlattices with periods ranging from 46 to 225 nm by chemical vapour deposition. Raman Opto-Thermal conductivity measurements of these superlattice structures show an approximately 50% reduction in thermal conductivity compared to pristine 12 C graphene. This average reduction is similar to the random isotope mix. The reduction of the thermal conductivity in the superlattice is well described by a model of pristine graphene and an additional quasi-one dimensional periodic interfacial thermal resistance of (2.5 ± 0.5)×10 −11 m 2 K/W for the 12 C/ 13 C boundary. This is consistent with a large anisotropic thermal conductivity in the superlattice, where the thermal conductivity depends on the orientation of the 12 C/ 13 C boundary.

show abstract

Reduction of phonon thermal conduction in isotopic graphene nanoribbon superlattices

Cited by 17 publications

References 22 publications

Thermal conductivity of graphene isotope superlattices

Thermal conductivity of graphene isotope superlattices

Phonon thermal conductivity reduction in silicene nanotubes with isotope substitution

Graphene Isotope Superlattices with Strongly Diminished Thermal Conductivity for Thermoelectric Applications

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