Tuning thermal conductivity in molybdenum disulfide by electrochemical intercalation

Gaohua Zhu (), Jun Liu (), Qiye Zheng, Ruigang Zhang, Dongyao Li, Debasish Banerjee and David G. Cahill ()
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Gaohua Zhu: Toyota Research Institute of North America
Jun Liu: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Qiye Zheng: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Ruigang Zhang: Toyota Research Institute of North America
Dongyao Li: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
Debasish Banerjee: Toyota Research Institute of North America
David G. Cahill: Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13211

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