The Potential Application of BAs for a Gas Sensor for Detecting SO₂ Gas Molecule: a DFT Study

Area of Science:

• Materials Science
• Computational Chemistry
• Surface Science

Background:

• Atmospheric gas molecule adsorption on novel materials is crucial for developing advanced sensors.
• Hexagonal boron arsenide (BAs) is an emerging material with unique electronic properties.
• Understanding gas-molecule interactions on BAs surfaces is key to unlocking its sensing potential.

Purpose of the Study:

• To investigate the adsorption behavior of various atmospheric gas molecules on pristine hexagonal boron arsenide (BAs).
• To evaluate the potential of BAs as a sensitive and selective gas sensor, particularly for SO2.
• To explore how gas adsorption affects the electronic properties of BAs.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to model gas molecule adsorption.
• Various adsorption sites on the BAs surface were systematically analyzed.
• Adsorption energy, charge transfer, and work function changes were calculated.

Main Results:

• Sulfur dioxide (SO2) exhibited the most favorable adsorption energy and shortest BAs surface distance among the studied gases.
• Significant charge transfer was observed between SO2 and the BAs surface.
• Adsorption influenced the work function, indicating potential for tuning electronic properties.

Conclusions:

• Hexagonal boron arsenide (BAs) demonstrates excellent adsorption characteristics for SO2.
• BAs is a promising candidate material for developing highly sensitive and selective SO2 gas sensors.
• The study highlights the importance of work function calculations for material property modulation.