Thermal conductivity anisotropy in molybdenum disulfide thin films
McLaren, Ryan C.
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https://hdl.handle.net/2142/14668
Description
Title
Thermal conductivity anisotropy in molybdenum disulfide thin films
Author(s)
McLaren, Ryan C.
Issue Date
2010-01-06T16:20:53Z
Director of Research (if dissertation) or Advisor (if thesis)
King, William P.
Doctoral Committee Chair(s)
King, William P.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
molybdenum disulfide
thermal conductivity
thin film
anisotropy
Abstract
This study was completed to determine the anisotropy in molybdenum disulfide, MoS2,
thin films. The hexagonal crystal structure of MoS2 and recent results on tungsten diselenide,
with a similar structure, lead to the belief that MoS2 may exhibit ultralow thermal conductivity.
Thermal conductivities were measured using the time-domain thermoreflectance method. MoS2
samples were prepared with different crystallographic orientations relative to the substrate by magnetron sputtering and ion-beam-assisted deposition. The thermal conductivity of MoS2 was measured as low as 0.2 W/m-K, very low for a fully dense solid and 3 times lower than in the
amorphous phase. Although thermal conductivity was not strongly dependent on the orientation
of the crystal structure, deposition parameters can be used to control thermal conductivity.
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