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Sub-ppb-Level Detection of Nitrogen Dioxide Based on High-Quality Black Phosphorus
Dan Han1,2, Xiaomei Han1,2, Lulu Liu1,2
1Shanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, China.
ACS Applied Materials & Interfaces
|March 11, 2022
Summary
A novel black phosphorus (BP) gas sensor utilizes few-layered BP microribbons for highly sensitive nitrogen dioxide (NO2) detection. This BP sensor achieves a record-low limit of detection for NO2, showing great promise for advanced gas sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Two-dimensional (2D) layered materials offer excellent gas sensitivity for sensor development.
- Black phosphorus (BP) is a promising 2D material, but its oxidation sensitivity poses challenges for gas sensing applications.
Purpose of the Study:
- To fabricate a highly sensitive gas sensor using few-layered black phosphorus (BP) microribbons.
- To investigate the sensing mechanisms and performance of BP microribbons for nitrogen dioxide (NO2) detection.
Main Methods:
- Fabrication of few-layered BP microribbons via a facile route.
- Characterization using energy dispersive spectroscopy (EDS) mapping.
- Gas sensing performance evaluation for NO2 detection.
- First-principles calculations to elucidate sensing mechanisms.
Main Results:
- BP microribbons exhibited nanoscale thin films and step-like structures due to in-plane slip during fabrication.
- The BP microribbon sensor demonstrated high response and a record-low limit of detection (LOD) of 0.4 ppb for NO2.
- Sensitization mechanisms include abundant nanoscale thin films, optimal bandgap, hierarchical homojunction, and strong NO2 adsorption.
- High selectivity, low LOD under high humidity, and good repeatability were observed.
Conclusions:
- Few-layered BP microribbons are effective for highly sensitive and selective NO2 detection.
- The unique nanostructure and electronic properties of BP microribbons enhance gas sensing performance.
- This work provides a promising platform for developing advanced 2D material-based gas sensors.
