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Characterization of Thermal Transport in One-dimensional Solid Materials
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Temperature-independent thermal radiation.

Alireza Shahsafi1, Patrick Roney1, You Zhou2

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2019
PubMed
Summary

Researchers developed novel ultrathin thermal emitters using samarium nickel oxide. These emitters achieve temperature-independent thermal emission, crucial for advanced infrared imaging and thermal management applications.

Keywords:
heat transferphase transitionquantum materialsthermal emissionthermal radiation

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Thermodynamics

Background:

  • All objects emit thermal radiation, governed by fundamental laws like Planck's.
  • Typically, thermal emission power correlates directly with temperature, enabling applications like thermometry.
  • Deviations from this relationship are rare and highly sought after for novel applications.

Purpose of the Study:

  • To engineer thermal emitters that decouple thermal emission from temperature.
  • To investigate the potential of quantum materials for controlling thermal radiation.
  • To create temperature-independent thermal emitters for specific spectral windows.

Main Methods:

  • Utilized samarium nickel oxide (SmNiO3), a quantum material exhibiting a phase transition.
  • Engineered the material's emissivity to counteract the Stefan-Boltzmann law.
  • Fabricated ultrathin thermal emitters capable of reversible, hysteresis-free operation.

Main Results:

  • Demonstrated ultrathin thermal emitters violating the monotonic temperature-emission relationship.
  • Achieved temperature-independent thermal emission in the 8-14 µm atmospheric window.
  • Maintained this property over a ~30 °C range around 120 °C.

Conclusions:

  • The developed SmNiO3 emitters offer precise control over thermal radiation.
  • This breakthrough enables control over object visibility in infrared cameras.
  • Quantum materials present new avenues for advanced thermal management and heat transfer control.