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Two-Dimensional Bimetallic Phthalocyanine Covalent-Organic-Framework-Based Chemiresistive Gas Sensor for ppb-Level NO 2 Detection.
- Source :
- Nanomaterials (2079-4991); May2023, Vol. 13 Issue 10, p1660, 17p
- Publication Year :
- 2023
-
Abstract
- Two-dimensional (2D) phthalocyanine-based covalent organic frameworks (COFs) provide an ideal platform for efficient and rapid gas sensing—this can be attributed to their regular structure, moderate conductivity, and a large number of scalable metal active centers. However, there remains a need to explore structural modification strategies for optimizing the sluggish desorption process caused by the extensive porosity and strong adsorption effect of metal sites. Herein, we reported a 2D bimetallic phthalocyanine-based COF (COF-CuNiPc) as chemiresistive gas sensors that exhibited a high gas-sensing performance to nitrogen dioxide (NO<subscript>2</subscript>). Bimetallic COF-CuNiPc with an asymmetric synergistic effect achieves a fast adsorption/desorption process to NO<subscript>2</subscript>. It is demonstrated that the COF-CuNiPc can detect 50 ppb NO<subscript>2</subscript> with a recovery time of 7 s assisted by ultraviolet illumination. Compared with single-metal phthalocyanine-based COFs (COF-CuPc and COF-NiPc), the bimetallic structure of COF-CuNiPc can provide a proper band gap to interact with NO<subscript>2</subscript> gas molecules. The CuNiPc heterometallic active site expands the overlap of d-orbitals, and the optimized electronic arrangement accelerates the adsorption/desorption processes. The concept of a synergistic effect enabled by bimetallic phthalocyanines in this work can provide an innovative direction to design high-performance chemiresistive gas sensors. [ABSTRACT FROM AUTHOR]
- Subjects :
- GAS detectors
BAND gaps
NITROGEN dioxide
DESORPTION
ADSORPTION (Chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 13
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Nanomaterials (2079-4991)
- Publication Type :
- Academic Journal
- Accession number :
- 163984623
- Full Text :
- https://doi.org/10.3390/nano13101660