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End Group Modification for Black Phosphorus: Simultaneous Improvement of Chemical Stability and Gas Sensing
Yanling Xu1, Xiaofang Li2, Yangyang Song1
1School of Materials Science & Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, China.
ACS Applied Materials & Interfaces
|October 12, 2021
Summary
We enhanced the stability of black phosphorus (BP) nanosheets for gas sensing by modifying their end groups. This silanization treatment improved NO2 sensitivity and humidity resistance, overcoming key limitations for practical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Black phosphorus (BP) nanosheets show promise for gas sensing due to high sensitivity and selectivity.
- Instability of BP nanosheets, particularly in humid conditions, hinders their practical application.
- Existing passivation methods can alter the electronic properties of BP.
Purpose of the Study:
- To improve the chemical stability and humidity resistance of BP nanosheets for gas sensing.
- To develop a controlled modification method that preserves the electronic structure of BP.
- To enhance the NO2 sensing performance of BP nanosheets.
Main Methods:
- Silanization treatment to modify BP nanosheet end groups.
- Modification using fluoroalkylsilane to impart hydrophobicity.
- Gas sensing measurements of pristine and modified BP nanosheets under varying humidity.
- Density functional theory (DFT) calculations to confirm interactions.
Main Results:
- Fluoroalkylsilane modification (F-BP) significantly enhanced the chemical stability of BP nanosheets in oxidizing and humid environments.
- F-BP exhibited a 3.9-fold increase in NO2 sensitivity compared to pristine BP.
- The NO2 sensing response of F-BP remained stable across a wide relative humidity range (5%-95%).
Conclusions:
- End group modification via silanization is an effective strategy to enhance BP nanosheet stability and humidity resistance.
- The developed F-BP material offers a promising solution for reliable gas sensing in ambient conditions.
- This approach overcomes the humidity dependence issue in gas sensors based on BP nanosheets.
