Fabrication of Molybdenum disulfide (MoS2) nanoflowers based highly sensitive temperature Sensor
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Abstract
With growing industrial automation, temperature sensing has become an
increasingly complex and highly important requirement. Besides, in few applications, wide
temperature ranges are often encountered, which need to be precisely monitored. This
necessitates the development of highly sensitive sensing materials which offer suitable
sensor properties in the widest possible temperature range. In this view, molybdenum
disulfide (MoS2), a layered semiconductor with tunable bandgap, has garnered immense
focus for its attractive electrical and thermal properties. Herein, we report simple and ecofriendly synthesis of MoS2 nanoflowers via a facile hydrothermal method. MoS2 sensor
were used in temperature sensing applications in different temperature ranges. The
synthesized MoS2 powder was characterized by X-ray Diffraction (XRD), scanning electron
microscope (SEM), Raman spectroscopy. The optical properties of MoS2 were analyzed by
UV-Vis spectroscopy and fluorescence. Temperature sensor is fabricated by dispersing
the MoS2 powder in N-Methyl-2-pyrrolidone (NMP) and depositing MoS2 thin films on
insulating glass substrate by drop cast technique. Temperature co-efficient of resistance
(TCR) & response- and recovery time are crucial parameters for highly sensitive temperature
sensor. The temperature sensing response of the fabricated sensor is monitored in both
high (298K–373K) and low (298K–173K) temperature ranges (Fig.1), with respective TCR
values being -0.70 %/K and -7.24 %/K. TCR values increases many fold in low (298K-173K)
temperature range. Sensor response- and recovery time are ~71s and ~76s, respectively in
high (298K-373K) temperature range. These studies are significant towards the fabrication of
simple, highly sensitive, and cost effective temperature sensor with high reproducibility. This
study paves the way for the development of 2D-TMDC based highly sensitive thermometer.
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Article Details
Molybdenum, Sensors
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