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Multilayer Graphene-Based Thermal Rectifier with Interlayer Gradient Functionalization.

Anran Wei1,2, Simanta Lahkar, Xingxin Li

  • 1State Key Laboratory of Information Photonics and Optical Communications , Beijing University of Posts and Telecommunications , Beijing 100876 , China.

ACS Applied Materials & Interfaces
|November 21, 2019
PubMed
Summary

Researchers developed a multilayer graphene thermal rectifier for efficient vertical heat flux control. This design overcomes lateral size limitations, enabling new applications in heat management and logic devices.

Keywords:
Interlayer gradient functionalizationMolecular dynamicsMultilayer grapheneRectificationThermal conduction

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Nanoscale thermal rectifiers exhibit asymmetric heat transport, analogous to electrical diodes.
  • Graphene is a promising material for thermal rectifiers, but existing designs are limited by lateral size.
  • Previous graphene-based thermal rectification primarily occurred in-plane, restricting applications.

Purpose of the Study:

  • To propose and demonstrate a novel multilayer graphene-based thermal rectifier (MGTR) with interlayer gradient functionalization.
  • To achieve efficient thermal rectification along the vertical direction, overcoming lateral size limitations.
  • To investigate the underlying mechanisms and influencing factors of vertical thermal rectification.

Main Methods:

  • Molecular dynamics simulations were employed to model and analyze the thermal transport properties of the MGTR.
  • Phonon density of states analysis was used to understand the frequency-dependent heat transport.
  • Systematic investigation of the effects of temperature, strain, and functionalization strategies.

Main Results:

  • A unique vertical thermal rectification phenomenon was demonstrated, with heat flux preferentially transporting from fully hydrogenated to pristine graphene layers.
  • The mismatch between dominant phonon frequency domains was identified as a key factor in vertical thermal rectification.
  • Interlayer welding was verified as an effective method to mitigate out-of-plane compression-induced degradation.
  • An anomalous enhancement in in-plane thermal conductivity was observed in gradient-hydrogenated multilayer graphene.

Conclusions:

  • The proposed MGTR design enables efficient, size-independent vertical thermal rectification.
  • Gradient functionalization and interlayer interactions are crucial for optimizing thermal rectification performance.
  • This work offers significant potential for advanced thermal management and logic control devices.