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Experimental Study on Thermal Conductivity and Rectification in Suspended Monolayer MoS2
journal contribution
posted on 2020-06-11, 22:03 authored by Xiao Yang, Xinghua Zheng, Qiushi Liu, Ting Zhang, Ye Bai, Zheng Yang, Haisheng Chen, Ming LiuThermal rectification
is an attractive phenomenon for thermal management,
which refers to a specific behavior in a heat transfer system where
heat flow in one direction is stronger than that in the opposite direction
under the same conditions. Two-dimensional monolayer molybdenum disulfide
(MoS2) synthesized by chemical vapor deposition (CVD) has
exhibited exceptional thermal, optical, and electrical properties
due to its special structure; however, the thermal rectification in
monolayer MoS2 is still not achieved by experimental measurement.
Here, we successfully transferred monolayer MoS2 samples
with three geometrical morphologies to the suspended microelectrodes
by the PMMA approach. Through further heating the suspended microelectrodes
with AC power in the opposite directions of these three monolayer
MoS2 samples, we experimentally measured the thermal conductivity
and first obtained the thermal rectification of monolayer MoS2. The rectification coefficients of monolayer MoS2 with three different geometrical morphologies are 10–13,
11–4, and 69–70%. Moreover, a theoretical model was
also applied to discuss the dependence of thermal rectification on
the geometrical asymmetry (angle and spacing). The results demonstrate
that the monolayer MoS2 has an obvious thermal rectification
phenomenon owing to the asymmetric structure, and it would have great
potentials in the application of thermal energy control and management.