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3D Anisotropic Thermal Conductivity of Exfoliated Rhenium Disulfide
Author(s) -
Jang Hyejin,
Ryder Christopher R.,
Wood Joshua D.,
Hersam Mark C.,
Cahill David G.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201700650
Subject(s) - materials science , thermal conductivity , raman spectroscopy , anisotropy , exfoliation joint , conductivity , transverse plane , phase (matter) , condensed matter physics , crystallography , composite material , graphene , optics , nanotechnology , chemistry , physics , structural engineering , engineering , organic chemistry
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 1 T 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.