Ultralow Thermal Conductivity and Thermal Diffusivity of Graphene/Metal Heterostructures through Scarcity of Low-Energy Modes in Graphene
In many ultralow thermal conductivity materials, interfaces of dissimilar materials are employed to impede heat flow perpendicular to the interfaces. However, when packed within a distance comparable to the phonon wavelengths, these interfaces are coupled and thus ineffective to scatter low-energy phonons, due to either coherent phonon transmission across the closely packed interfaces or weak coupling of the low-energy phonons and the interfaces. Here, we propose to block the propagation of these low-energy phonons by periodically distributed scarcity of available low-energy phonon modes using graphene/metal heterostructures of transferred graphene and ultrathin metal films. We demonstrate the effectiveness of graphene in blocking propagation of low-energy phonons by comparing the effective transmission probabilities of phonons in a wide range of multilayered structures; we find that interfaces in our graphene/metal heterostructures remain decoupled even when the spacing between interfaces is <2 nm. With the proposed strategy, we successfully achieve an ultralow thermal conductivity of Λ = 0.06 W m-1 K-1 and a world-record lowest thermal diffusivity of α = 2.6 × 10-4 cm2 s-1 suitable for thermal insulation. Moreover, we demonstrate the capability to tune the electronic heat transport across the new materials by creating atomic-scale pinholes on graphene through magnetron sputtering, with electrons carrying ≈50% of heat when Λ is ≈0.15 W m-1 K-1. With the ultralow Λ and substantial electronic transport, the new graphene/metal heterostructures could be explored for thermoelectric applications.
Medienart: |
E-Artikel |
---|
Erscheinungsjahr: |
2020 |
---|---|
Erschienen: |
2020 |
Enthalten in: |
Zur Gesamtaufnahme - volume:12 |
---|---|
Enthalten in: |
ACS applied materials & interfaces - 12(2020), 8 vom: 26. Feb., Seite 9572-9579 |
Sprache: |
Englisch |
---|
Beteiligte Personen: |
Zheng, Weidong [VerfasserIn] |
---|
Links: |
---|
Themen: |
Effective transmission probability |
---|
Anmerkungen: |
Date Revised 27.02.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
---|
doi: |
10.1021/acsami.9b18290 |
---|
funding: |
|
---|---|
Förderinstitution / Projekttitel: |
|
PPN (Katalog-ID): |
NLM305094262 |
---|
LEADER | 01000naa a22002652 4500 | ||
---|---|---|---|
001 | NLM305094262 | ||
003 | DE-627 | ||
005 | 20231225120423.0 | ||
007 | cr uuu---uuuuu | ||
008 | 231225s2020 xx |||||o 00| ||eng c | ||
024 | 7 | |a 10.1021/acsami.9b18290 |2 doi | |
028 | 5 | 2 | |a pubmed24n1016.xml |
035 | |a (DE-627)NLM305094262 | ||
035 | |a (NLM)31909972 | ||
040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
041 | |a eng | ||
100 | 1 | |a Zheng, Weidong |e verfasserin |4 aut | |
245 | 1 | 0 | |a Ultralow Thermal Conductivity and Thermal Diffusivity of Graphene/Metal Heterostructures through Scarcity of Low-Energy Modes in Graphene |
264 | 1 | |c 2020 | |
336 | |a Text |b txt |2 rdacontent | ||
337 | |a ƒaComputermedien |b c |2 rdamedia | ||
338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
500 | |a Date Revised 27.02.2020 | ||
500 | |a published: Print-Electronic | ||
500 | |a Citation Status PubMed-not-MEDLINE | ||
520 | |a In many ultralow thermal conductivity materials, interfaces of dissimilar materials are employed to impede heat flow perpendicular to the interfaces. However, when packed within a distance comparable to the phonon wavelengths, these interfaces are coupled and thus ineffective to scatter low-energy phonons, due to either coherent phonon transmission across the closely packed interfaces or weak coupling of the low-energy phonons and the interfaces. Here, we propose to block the propagation of these low-energy phonons by periodically distributed scarcity of available low-energy phonon modes using graphene/metal heterostructures of transferred graphene and ultrathin metal films. We demonstrate the effectiveness of graphene in blocking propagation of low-energy phonons by comparing the effective transmission probabilities of phonons in a wide range of multilayered structures; we find that interfaces in our graphene/metal heterostructures remain decoupled even when the spacing between interfaces is <2 nm. With the proposed strategy, we successfully achieve an ultralow thermal conductivity of Λ = 0.06 W m-1 K-1 and a world-record lowest thermal diffusivity of α = 2.6 × 10-4 cm2 s-1 suitable for thermal insulation. Moreover, we demonstrate the capability to tune the electronic heat transport across the new materials by creating atomic-scale pinholes on graphene through magnetron sputtering, with electrons carrying ≈50% of heat when Λ is ≈0.15 W m-1 K-1. With the ultralow Λ and substantial electronic transport, the new graphene/metal heterostructures could be explored for thermoelectric applications | ||
650 | 4 | |a Journal Article | |
650 | 4 | |a effective transmission probability | |
650 | 4 | |a graphene/metal heterostructures | |
650 | 4 | |a thermal insulation | |
650 | 4 | |a thermoelectric application | |
650 | 4 | |a ultralow thermal conductivity and thermal diffusivity | |
700 | 1 | |a Huang, Bin |e verfasserin |4 aut | |
700 | 1 | |a Koh, Yee Kan |e verfasserin |4 aut | |
773 | 0 | 8 | |i Enthalten in |t ACS applied materials & interfaces |d 2009 |g 12(2020), 8 vom: 26. Feb., Seite 9572-9579 |w (DE-627)NLM194100049 |x 1944-8252 |7 nnns |
773 | 1 | 8 | |g volume:12 |g year:2020 |g number:8 |g day:26 |g month:02 |g pages:9572-9579 |
856 | 4 | 0 | |u http://dx.doi.org/10.1021/acsami.9b18290 |3 Volltext |
912 | |a GBV_USEFLAG_A | ||
912 | |a GBV_NLM | ||
951 | |a AR | ||
952 | |d 12 |j 2020 |e 8 |b 26 |c 02 |h 9572-9579 |