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Preprint
Violation of the Wiedemann-Franz law and ultra-low thermal conductivity of Ti$_3$C$_2$T$_x$ MXene
02 Dec 2024
Abstract
ACS Nano 2024, 18, 47, 32491-32497 The high electrical conductivity and good chemical stability of MXenes offer
hopes for their use in many applications, such as wearable electronics, energy
storage, or electromagnetic interference shielding. While their optical,
electronic and electrochemical properties have been widely studied, the
information on thermal properties of MXenes is scarce. In this study, we
investigate the heat transport properties of Ti$_3$C$_2$T$_x$ MXene single
flakes using scanning thermal microscopy and find exceptionally low anisotropic
thermal conductivities within the Ti$_3$C$_2$T$_x$ flakes, leading to an
effective thermal conductivity of 0.78$\pm$0.21 W m$^{-1}$ K$^{-1}$. This
observation is in stark contrast to the predictions of the Wiedemann-Franz law,
as the estimated Lorenz number is only 0.25 of the classical value. Due to the
combination of low thermal conductivity and low emissivity of Ti$_3$C$_2$T$_x$,
the heat loss from it is two orders of magnitude smaller than that from common
metals. Our study explores the heat transport mechanisms of MXenes and
highlights a promising approach for developing thermal insulation,
two-dimensional thermoelectric, or infrared stealth materials.
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Details
- Title
- Violation of the Wiedemann-Franz law and ultra-low thermal conductivity of Ti$_3$C$_2$T$_x$ MXene
- Creators
- Yubin HuangJean SpieceTetiana ParkerAsaph LeeYury GogotsiPascal Gehring
- Resource Type
- Preprint
- Language
- English
- Academic Unit
- Materials Science and Engineering; A.J. Drexel Nanomaterials Institute
- Other Identifier
- 991021985103604721