Cu_γ (γ = 1-3)-Modified MoS₂ Monolayer as a Gas Sensor for Detecting C₄F₇N and Its Decomposition Components

Area of Science:

• Materials Science
• Environmental Science
• Electrical Engineering

Background:

• Perfluorinated isobutyronitrile (C4F7N) is an eco-friendly insulating gas for electrical engineering.
• Decomposition of C4F7N under electrical stress degrades insulating properties, risking equipment failure.
• Understanding C4F7N decomposition products is crucial for maintaining power equipment.

Purpose of the Study:

• Investigate the adsorption of C4F7N and its toxic decomposition product, acetonitrile (C2N2), on copper-cluster-doped MoS2 surfaces.
• Evaluate the influence of copper cluster size and external electric fields on adsorption behavior.
• Determine the suitability of modified MoS2 surfaces for gas-sensitive sensor applications.

Main Methods:

• Density Functional Theory (DFT) calculations.
• Adsorption energy calculations.
• Density of States (DOS) analysis.
• Simulation of external electric fields.

Main Results:

• Adsorption energy of C4F7N on Cuγ-MoS2 decreases with increasing copper cluster size (γ=1-3).
• Copper-modified MoS2 surfaces exhibit varying adsorption affinities for C4F7N and C2N2.
• Cu3-MoS2 demonstrated the most favorable characteristics for sensor applications.

Conclusions:

• Copper-doped MoS2 surfaces show potential for sensing C4F7N and its decomposition products.
• Cu3-MoS2 is identified as a promising substrate for resistive-based gas-sensitive sensors.
• This research provides a theoretical basis for maintaining power equipment using advanced insulating gases.