Mo 2 C-Based Microfluidic Gas Sensor Detects SF 6 Decomposition Components: A First-Principles Study.

Mo₂C is a two-dimensional material with high electrical conductivity, low power consumption, and catalytic effect, which has promising applications in the field of microfluidic gas detection. First principles were used to study the adsorption characteristics of Mo₂C monolayer on four typical decomposition gases of SF₆ (H₂S, SO₂, SOF₂, and SO₂F₂), and to explore the feasibility of its application in the detection of SF₆ decomposition components. The results showed that Mo₂C chemisorbed all four gases, and the adsorption capacity was H₂S < SO₂ < SOF₂ < SO₂F₂. The adsorption mechanism of Mo₂C as a microfluidic sensor was analyzed in combination with its charge-density difference and density of states. On the other hand, the different work-function change trends after adsorbing gases provide the possibility for Mo₂C to selectively detect gases as a low-power field-effect transistor sensor. All content can be used as theoretical guidance in the realization of Mo₂C as a gas-sensitive material for the detection of SF₆ decomposition components. [ABSTRACT FROM AUTHOR]