Thermal Transport Properties of Na2X (X = O and S) Monolayers

Xinxin Yan, Wei Cao*, Haohuan Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Motivated by the excellent functional thin film devices made from two-dimensional materials, we investigated the thermal transport properties of Na2X (X = O and S) monolayers using first-principle calculations. The thermal conductivity at room temperature was 1.055 W/mK and 1.822 W/mK for the Na2O monolayers and Na2S monolayers, respectively. The high thermal conductivity for the Na2S monolayers is mainly contributed to by in-plane transverse acoustic (TA) phonons. The group velocity for the Na2S monolayers exhibits lower group velocity and a larger phonon relaxation time than the Na2O monolayers. Our results are helpful for functional thin film devices made using Na2X (X = O and S) monolayers.

Original languageEnglish
Article number1294
Issue number9
StatePublished - Sep 2022
Externally publishedYes


  • first-principle calculations
  • phonon scattering
  • thermal conductivity
  • two-dimensional structure


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