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Highly selective and reversible NO₂ gas sensor using vertically aligned MoS₂ flake networks.

Rahul Kumar¹, Pawan K Kulriya², Monu Mishra³

¹Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India.

|September 1, 2018

Summary

This study presents a highly selective and reversible nitrogen dioxide (NO₂) gas sensor. Vertically aligned MoS₂ (VA-MoS₂) networks show enhanced NO₂ detection at low temperatures.

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Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes

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Published on: March 21, 2018

Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Resistive gas sensors are crucial for environmental monitoring and industrial safety.
Molybdenum disulfide (MoS₂) is a promising 2D material for gas sensing applications.
Controlling the morphology and orientation of MoS₂ flakes can significantly impact sensor performance.

Purpose of the Study:

To develop a highly selective and reversible resistive gas sensor for nitrogen dioxide (NO₂).
To investigate the effect of vertically aligned MoS₂ (VA-MoS₂) flake networks on NO₂ sensing performance.
To optimize operating conditions for enhanced NO₂ detection and recovery.

Main Methods:

Synthesis of horizontally and vertically aligned MoS₂ flakes on SiO₂/Si substrates via kinetically controlled rapid growth CVD.
Characterization of MoS₂ flake networks using SEM, XRD, Raman spectroscopy, and XPS.
Fabrication and testing of resistive gas sensors based on VA-MoS₂ and horizontally aligned MoS₂.

Main Results:

VA-MoS₂ gas sensors demonstrated a two-fold higher response to NO₂ compared to horizontally aligned MoS₂ at room temperature.
Sensors exhibited excellent recovery upon NO₂ exposure at an optimal operating temperature of 100 °C.
High response to NO₂ was attributed to strong interactions with gas molecules on the edge sites of VA-MoS₂.

Conclusions:

Vertically aligned MoS₂ flake networks offer superior performance for selective and reversible NO₂ gas sensing.
The high aspect ratio and exposed edge sites of VA-MoS₂ contribute to enhanced gas adsorption and sensing capabilities.
The developed VA-MoS₂ sensor shows potential for practical applications in NO₂ detection at low operating temperatures.