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Updated: Jun 6, 2025
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Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
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Anomalous Thermal Transport in Compressed Carbon Phases
Zefang Ye1, Janghan Park1, Yongjian Zhou1
1Walker Department of Mechanical Engineering, <a href="https://ror.org/00hj54h04">The University of Texas at Austin</a>, Austin, Texas 78712, USA.
Physical Review Letters
|December 3, 2024
Summary
Compressive strain dramatically alters carbon
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Carbon materials like graphene exhibit unique properties such as superconductivity and anisotropic thermal conductivity.
- The effects of compressive strain on carbon's thermal conductivity and phase transitions are not well understood.
Purpose of the Study:
- To investigate the in-situ high-pressure thermal conductivity of compressed graphitic phases.
- To explore the relationship between strain-induced structural transitions and thermal transport in carbon.
Main Methods:
- Utilized picosecond transient thermoreflectance for in-situ thermal conductivity measurements under high pressure.
- Employed first-principles calculations to model material behavior.
- Conducted complementary in-situ Raman spectroscopy and X-ray diffraction analyses.
Main Results:
- Observed an anomalous thermal conductivity peaking at 260 W/mK around 15-20 GPa.
- Noted a significant drop in thermal conductivity to 3.0 W/mK at approximately 35 GPa.
- Correlated these changes with interlayer buckling and sp2 to sp3 bonding transitions.
Conclusions:
- The abnormal thermal conductivity is driven by phonon transport influenced by structural and bonding changes.
- Formation of M-carbon nanocrystals and amorphous carbon phases contribute to the observed trends.
- Strain engineering offers a pathway to tune thermal and mechanical properties of carbon materials.
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