Stanene based gas sensors: effect of spin-orbit coupling

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Stanene, a 2D material, is being explored for gas sensing applications.
• Doping can significantly alter the electronic and chemical properties of 2D materials.
• Understanding interactions between gas molecules and stanene is crucial for sensor development.

Purpose of the Study:

• To investigate the gas sensing properties of pure and doped stanene (B@, N@, B-N@) for NO, NO2, NH3, and N2O.
• To analyze the electronic properties and interaction mechanisms using computational methods.
• To evaluate the potential of doped stanene for advanced semiconductor gas sensors and spintronic applications.

Main Methods:

• Density Functional Theory (DFT) calculations with dispersion correction (DFT-D3).
• Analysis of charge density difference (CDD), electrostatic potential (ESP), and Bader charge.
• Investigation of electronic properties with and without spin-orbit coupling (SOC).

Main Results:

• Doping stanene with B@, N@, and B-N@ significantly improves interactions with gas molecules.
• Pure and doped stanene systems exhibit Rashba-type spin-splitting under SOC, indicating spintronic potential.
• Doped stanene demonstrates higher selectivity and sensitivity towards target gas molecules compared to pure stanene.

Conclusions:

• B@, N@, and B-N@ doped stanene exhibit enhanced gas sensing performance.
• The observed spin-splitting opens avenues for spintronic device applications.
• Doped stanene materials are promising candidates for next-generation semiconductor-based gas sensors.