| Autor: |
Šilhavík, Martin, Kumar, Prabhat, Levinský, Petr, Zafar, Zahid Ali, Hejtmánek, Jiří, Červenka, Jiří |
| Předmět: |
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| Zdroj: |
Small Methods; Sep2024, Vol. 8 Issue 9, p1-8, 8p |
| Abstrakt: |
In the quest to improve energy efficiency and design better thermal insulators, various engineering strategies have been extensively investigated to minimize heat transfer through a material. Yet, the suppression of thermal transport in a material remains elusive because heat can be transferred by multiple energy carriers. Here, the realization of Anderson localization of phonons in a random 3D elastic network of graphene is reported. It is shown 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. The 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, 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. This approach will enable the development of a new type of high‐performance insulation solutions and thermally superinsulating materials with metal‐like electrical conductivity. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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