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Two-Dimensional Tetragonal GaN as Potential Molecule Sensors for NO and NO2 Detection: A First-Principle Study
Yongliang Yong1,2, Xiangying Su1, Hongling Cui1
1College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
ACS Omega
|August 29, 2019
Summary
Tetragonal gallium nitride (T-GaN) shows strong chemisorption for nitrogen dioxide (NO2) and nitric oxide (NO) gas molecules. This suggests T-GaN is a promising material for NO2 and NO gas sensors due to significant electronic changes and short recovery times.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Two-dimensional materials offer unique electronic and surface properties.
- Gallium nitride (GaN) is a versatile semiconductor with potential in gas sensing applications.
- Tetragonal GaN (T-GaN) presents a novel structural configuration for exploring new functionalities.
Purpose of the Study:
- To investigate the adsorption properties of gas molecules (NO, NH3, and NO2) on T-GaN.
- To evaluate the suitability of T-GaN for gas sensing applications.
- To understand the electronic and magnetic responses of T-GaN upon gas molecule adsorption.
Main Methods:
- First-principles calculations were employed to simulate gas molecule adsorption.
- Calculations included adsorption energy, charge transfer, and electronic property analysis.
- Recovery time and magnetic property changes were also investigated.
Main Results:
- All three gas molecules (NO, NH3, NO2) exhibited chemisorption on T-GaN.
- Significant changes in electronic properties and electric conductivity were observed for NO2 and NO adsorption.
- T-GaN demonstrated short recovery times for NO2 and NO, but long recovery times for NH3.
- Magnetic properties of T-GaN were notably altered by NO and NO2 adsorption.
Conclusions:
- T-GaN shows strong interactions with NO2 and NO, indicating potential for gas sensing.
- The material's electronic and magnetic properties are sensitive to NO and NO2 adsorption.
- T-GaN is a promising candidate for developing selective NO2 and NO gas sensors.
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