title: Tuning thermal conductivity in molybdenum disulfide by electrochemical intercalation.
abstract: Thermal conductivity of two-dimensional (2D) materials is of interest for energy storage, nanoelectronics and optoelectronics. Here, we report that the thermal conductivity of molybdenum disulfide can be modified by electrochemical intercalation. We observe distinct behaviour for thin films with vertically aligned basal planes and natural bulk crystals with basal planes aligned parallel to the surface. The thermal conductivity is measured as a function of the degree of lithiation, using time-domain thermoreflectance. The change of thermal conductivity correlates with the lithiation-induced structural and compositional disorder. We further show that the ratio of the in-plane to through-plane thermal conductivity of bulk crystal is enhanced by the disorder. These results suggest that stacking disorder and mixture of phases is an effective mechanism to modify the anisotropic thermal conductivity of 2D materials.
authors: Materials Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105, USA.
authors: Gaohua
authors: G
authors: Zhu
authors: Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.|Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.
authors: Jun
authors: J
authors: Liu
authors: Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors: Qiye
authors: Q
authors: Zheng
authors: Materials Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105, USA.
authors: Ruigang
authors: R
authors: Zhang
authors: Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors: Dongyao
authors: D
authors: Li
authors: Materials Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105, USA.
authors: Debasish
authors: D
authors: Banerjee
authors: Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors: David G
authors: DG
authors: Cahill