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Porphyrin-Based COF 2D Materials: Variable Modification of Sensing Performances by Post-Metallization
Ming Liu1, Yong-Jun Chen2,3, Xin Huang1
1Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
Angewandte Chemie (International Ed. in English)
|January 12, 2022
Summary
New 2D nanomaterials (covalent organic frameworks) offer highly sensitive and specific room-temperature detection of nitrogen dioxide (NO2). Metallized materials, particularly cobalt-TPCOF, show ultra-low detection limits for gas sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Two-dimensional (2D) nanomaterials with tunable surfaces are crucial for chemiresistive gas sensing at room temperature.
- Covalent organic frameworks (COFs) offer unique structural properties for advanced material design.
Purpose of the Study:
- To develop novel 2D COF nanomaterials for highly sensitive and specific room-temperature NO2 detection.
- To investigate the effect of surface modification via post-metallization on gas sensing performance.
Main Methods:
- Synthesis of porphyrin-based COF nanosheets (NS) with reduced interlayer interactions.
- Post-metallization of H2-TPCOF with cobalt (Co) and copper (Cu) to create M-TPCOF.
- Evaluation of gas sensing performance, including sensitivity, selectivity, limit-of-detection, and response/recovery times for NO2.
Main Results:
- Metallized M-TPCOF (Co and Cu) demonstrated significantly enhanced sensing capabilities compared to the pristine material.
- Co-TPCOF exhibited exceptional specificity and sensitivity towards NO2, achieving an ultra-low limit-of-detection of 6.8 ppb.
- The material showed fast response and recovery times, indicating efficient gas detection.
Conclusions:
- Surface-modifiable 2D COF nanomaterials, particularly Co-TPCOF, are promising for high-performance room-temperature NO2 sensing.
- This work provides a pathway for designing advanced 2D materials with tailored surface properties for diverse chemical applications.
