Giant near-field radiative heat transfer between MXene sheets

Area of Science:

• Materials Science
• Nanotechnology
• Thermal Physics

Background:

• Near-field thermal radiation is critical for nanoscale applications like imaging and thermophotovoltaics.
• Energy transfer relies on evanescent waves and photon tunneling at sub-wavelength separations.

Purpose of the Study:

• Investigate near-field radiative heat transfer (NFRHT) between MXene sheets.
• Compare MXene's performance against conventional materials for thermal management.

Main Methods:

• Systematic investigation of NFRHT between MXene sheets.
• Comparative analysis with silver films, graphene, and blackbody limits.
• Quantitative characterization of temperature, doping, distance, and substrate effects.

Main Results:

• MXene exhibits a 10^4-fold enhancement over the blackbody limit at 10 nm gaps.
• Dominant mechanism identified as transverse magnetic (TM) polarized surface plasmon polaritons (SPPs) coupling.
• Monolayer MXene achieves 2100 times blackbody limit heat flux at 10 nm gaps, outperforming silver and graphene.

Conclusions:

• MXene demonstrates exceptional NFRHT performance, surpassing conventional materials.
• Strong SPP coupling in MXene is key to its enhanced thermal transfer capabilities.
• MXene is a promising material for next-generation thermal management and thermophotovoltaics.