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Issue 37, 2020
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Net negative contributions of free electrons to the thermal conductivity of NbSe3 nanowires

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Abstract

Understanding transport mechanisms of electrons and phonons, two major energy carriers in solids, are crucial for various engineering applications. It is widely believed that more free electrons in a material should correspond to a higher thermal conductivity; however, free electrons also scatter phonons to lower the lattice thermal conductivity. The net contribution of free electrons has been rarely studied because the effects of electron–phonon (e–ph) interactions on lattice thermal conductivity have not been well investigated. Here an experimental study of e–ph scattering in quasi-one-dimensional NbSe3 nanowires is reported, taking advantage of the spontaneous free carrier concentration change during charge density wave (CDW) phase transition. Contrary to the common wisdom that more free electrons would lead to a higher thermal conductivity, results show that during the depinning process of the condensed electrons, while the released electrons enhance the electronic thermal conductivity, the overall thermal conductivity decreases due to the escalated e–ph scattering. This study discloses how competing effects of free electrons result in unexpected trends and provides solid experimental data to dissect the contribution of e–ph scattering on lattice thermal conductivity. Lastly, an active thermal switch design is demonstrated based on tuning electron concentration through electric field.

Graphical abstract: Net negative contributions of free electrons to the thermal conductivity of NbSe3 nanowires

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Article information


Submitted
29 Jun 2020
Accepted
14 Sep 2020
First published
14 Sep 2020

Phys. Chem. Chem. Phys., 2020,22, 21131-21138
Article type
Paper

Net negative contributions of free electrons to the thermal conductivity of NbSe3 nanowires

Z. Pan, L. Yang, Y. Tao, Y. Zhu, Y. Xu, Z. Mao and D. Li, Phys. Chem. Chem. Phys., 2020, 22, 21131
DOI: 10.1039/D0CP03484C

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