Monatomic reactions with single vacancy monolayer h-BN: DFT studies.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Hexagonal boron nitride (h-BN) is crucial for advanced applications.
• Tailoring h-BN properties often involves adatom adsorption and defect engineering.

Purpose of the Study:

• Investigate the impact of 1st and 2nd row element adsorption on h-BN's electronic properties.
• Assess changes in atomic charges, adsorption energies, and density of states.
• Explore the potential of decorated and defected h-BN for chemical sensing.

Main Methods:

• Density Functional Theory (DFT) computations were employed.
• Adsorption of H, Li, C, O, Al, Si, P, and S on pristine and defective h-BN (B and N vacancies) was simulated.
• Key electronic properties including band gap and magnetic contributions were analyzed.

Main Results:

• Adsorption significantly altered h-BN's electronic properties, with band gaps ranging from 0.33 eV (Li) to 4.14 eV (P).
• Magnetic properties varied considerably based on the adatom.
• The study identified specific modifications beneficial for CO gas sensing.

Conclusions:

• Adatom adsorption and defect engineering offer effective routes to tune h-BN's electronic and magnetic characteristics.
• Modified h-BN shows promise as a sensitive chemical sensor for gases like CO.
• This research provides a theoretical framework for designing functionalized h-BN materials.