Anderson localization of phonons in thermally superinsulating graphene aerogels with metal-like electrical conductivity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00587988" target="_blank" >RIV/68378271:_____/24:00587988 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0355083" target="_blank" >https://hdl.handle.net/11104/0355083</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/smtd.202301536" target="_blank" >10.1002/smtd.202301536</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Anderson localization of phonons in thermally superinsulating graphene aerogels with metal-like electrical conductivity

Popis výsledku v původním jazyce

Here, we report the realization of Anderson localization of phonons in a random three-dimensional elastic network of graphene. We show that thermal conductivity in a cellular graphene aerogel can be drastically reduced to 0.9 mW m-1 K-1 by the application of compressive strain while keeping a high metal-like electrical conductivity of 120 S m-1 and ampacity of 0.9 A. Our experiments reveal that the strain can cause phonon localization over a broad compression range. The remaining heat flow in the material is dominated by charge transport. Conversely, the electrical conductivity exhibits a gradual increase with increasing compressive strain, opposite to the thermal conductivity. These results imply that strain engineering provides the ability to independently tune charge and heat transport, establishing a new paradigm for controlling phonon and charge conduction in solids.

Název v anglickém jazyce

Anderson localization of phonons in thermally superinsulating graphene aerogels with metal-like electrical conductivity

Popis výsledku anglicky

Here, we report the realization of Anderson localization of phonons in a random three-dimensional elastic network of graphene. We show that thermal conductivity in a cellular graphene aerogel can be drastically reduced to 0.9 mW m-1 K-1 by the application of compressive strain while keeping a high metal-like electrical conductivity of 120 S m-1 and ampacity of 0.9 A. Our experiments reveal that the strain can cause phonon localization over a broad compression range. The remaining heat flow in the material is dominated by charge transport. Conversely, the electrical conductivity exhibits a gradual increase with increasing compressive strain, opposite to the thermal conductivity. These results imply that strain engineering provides the ability to independently tune charge and heat transport, establishing a new paradigm for controlling phonon and charge conduction in solids.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/EH22_008%2F0004558" target="_blank" >EH22_008/0004558: Pokročilé víceškálové materiály pro nosné klíčové technologie</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Small Methods

ISSN

2366-9608

e-ISSN

2366-9608

Svazek periodika

8

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

2301536

Kód UT WoS článku

001197043600001

EID výsledku v databázi Scopus

2-s2.0-85189703118