A novel method for thermal conductivity measurement of two dimensional materials
Author(s)
Advisor
Kasırga, Talip SerkanDate
2019-09Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Thermal conductivity is a quantity which governs the heat transfer in a material.
After increasing importance of efficiency in power generation systems and
cooling mechanisms in micro-structures, many measurement methods have been
developed to explore the thermal conductivity in micro and nano-sized materials.
However, complexity in experimental setups, difficulties in the fabrication of
devices required for measurements, and lacking exact solutions to thermal equations
limit the usability of the methods to a class of materials. It is particularly
challenging to study atomically thin metallic materials. To tackle this challenge,
we have developed a new thermal conductivity measurement method based on
the temperature dependent electrical resistance change and analyzed our method
analytically and numerically by finite element method. We applied our method
to 2H-TaS2 and found thermal conductivity as 9.55 1.27 W/m.K. Thermal conductivity
value of TaS2, a metallic transition metal dichalcogenide was measured
for the first time. This is supported by Wiedemann-Franz law and thermal conductivity
of similar materials such as 2H-TaSe2 and 1T-TaS2. The method can be
applied to semiconducting thin materials as well and is superior to other methods
in various ways.
Keywords
Thermal conductivity2D materials
Temperature dependent resistance change
Finite element method
Heat equation