3D anisotropic thermal conductivity of exfoliated rhenium disulfide

Hyejin Jang, Christopher R. Ryder, Joshua D. Wood, Mark C. Hersam, David G. Cahill

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

ReS 2 represents a different class of 2D materials, which is characterized by low symmetry having 1D metallic chains within the planes and extremely weak interlayer bonding. Here, the thermal conductivity of single-crystalline ReS 2 in a distorted 1T phase is determined at room temperature for the in-plane directions parallel and perpendicular to the Re-chains, and the through-plane direction using time-domain thermoreflectance. ReS 2 is prepared in the form of flakes having thicknesses of 60–450 nm by micromechanical exfoliation, and their crystalline orientations are identified by polarized Raman spectroscopy. The in-plane thermal conductivity is higher along the Re-chains, (70 ± 18) W m −1 K −1 , as compared to transverse to the chains, (50 ± 13) W m −1 K −1 . As expected from the weak interlayer bonding, the through-plane thermal conductivity is the lowest observed to date for 2D materials, (0.55 ± 0.07) W m −1 K −1 , resulting in a remarkably high anisotropy of (130 ± 40) and (90 ± 30) for the two in-plane directions. The thermal conductivity and interface thermal conductance of ReS 2 are discussed relative to the other 2D materials.

Original languageEnglish
Article number1700650
JournalAdvanced Materials
Volume29
Issue number35
DOIs
Publication statusPublished - Jan 1 2017

Keywords

  • 2D materials
  • ReS
  • Rhenium disulfide
  • TDTR
  • Thermal conductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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