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Exploiting Two-Dimensional Bi2 O2 Se for Trace Oxygen Detection
Shipu Xu1, Huixia Fu2, Ye Tian3
1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Angewandte Chemie (International Ed. in English)
|July 10, 2020
Summary
This study introduces a novel trace oxygen sensor using 2D bismuth oxychalcogenide (Bi2O2Se) nanoplates. These sensors offer ultrahigh sensitivity and a low detection limit for accurate oxygen monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Trace oxygen detection is critical in various industrial and environmental applications.
- Developing highly sensitive and stable oxygen sensors remains a significant challenge.
Purpose of the Study:
- To develop a high-performance resistive-type trace oxygen sensor.
- To investigate the sensing mechanism of 2D Bi2O2Se nanoplates for oxygen detection.
Main Methods:
- Utilized 2D high-mobility semiconducting Bi2O2Se nanoplates.
- Employed scanning tunneling microscopy and first-principle calculations.
- Fabricated and tested resistive-type oxygen sensors.
Main Results:
- Confirmed formation of an amorphous Se atomic layer on Bi2O2Se surfaces upon oxygen exposure.
- Observed significant oxygen-adsorption induced variations in carrier density and mobility.
- Achieved ultrahigh sensitivity with a minimum detection limit of 0.25 ppm and wide-range response up to 400 ppm.
- Demonstrated long-term stability, high durability, and sub-0.25 ppm detection with arrayed sensors.
Conclusions:
- 2D Bi2O2Se nanoplates are ideal for trace oxygen detection due to their unique surface structure and electronic properties.
- The developed sensors exhibit advanced characteristics for sensitive and reliable oxygen monitoring.
- Ease of integration makes 2D Bi2O2Se a promising material for next-generation oxygen sensing technologies.
