Thermal Conductivity of Graphene Under Various Strains and Functionalizations

Strategic Insights -

Researchers at the University of Tehran have conducted an in-depth study on the thermal conductivity of pristine graphene and its functionalized variants under different tensile and compressive strains. The study found that pristine graphene exhibits exceptional thermal conductivity of up to 165.71 W/m K, while functionalized graphene, particularly Graphene-CH3, shows a drastic reduction in conductivity, making it highly promising for thermal insulation applications. Additionally, the study highlights the impact of mechanical strain on thermal transport in graphene, providing critical insight into the interplay of functionalization-strain-thermal transport.

Key Takeaways:

  • Pristine graphene exhibits exceptional thermal conductivity of up to 165.71 W/m K due to its perfect lattice structure and negligible phonon scattering.
  • Functionalized graphene, particularly Graphene-CH3, shows a drastic reduction in conductivity, making it highly promising for thermal insulation applications.
  • Graphene-CH3 has maintained better performance at lower strains, while Graphene-H and Graphene-C2H5 have shown significant degradation beyond 5% strain.
  • Compressive strain has accentuated phonon scattering with Graphene-CH3 reaching a minimum conductivity of 0.43 W/m K at 7% strain.
  • The study highlights the chemical functionalization and tunability of graphene by mechanical strain.
  • The research has provided critical insight into the interplay of functionalization-strain-thermal transport in graphene.

Statistics:

  • Thermal conductivity of pristine graphene: up to 165.71 W/m K.
  • Conductivity of functionalized Graphene-CH3: up to 97% reduction at 30% functionalization level.
  • Conductivity of functionalized Graphene-H: moderate degradation.
  • Conductivity of functionalized Graphene-C2H5: significant drop due to bulkier ethyl groups.
  • Strain at which pristine grapheme retains 74% of its conductivity: 70%.

Sources:

  • "Thermal Conductivity of Monolayer and Functionalized Graphene Subjected To Tensile and Compressive Strain Using Molecular Dynamics Simulations." Applied Physics A, 2025; 131(10).
  • University of Tehran, College of Engineering, School of Mechanical Engineering, Tehran, Iran.
  • Majid Baniassadi, Nava Zarkhah, Mostafa Baghani, Saba Samankan, Daniel George, Ali Taheri, Ali Rajabpour.