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A multi-platform sensor for selective and sensitive H 2 S monitoring: Three-dimensional macroporous ZnO encapsulated by MOFs with small Pt nanoparticles.
- Source :
-
Journal of hazardous materials [J Hazard Mater] 2022 Mar 15; Vol. 426, pp. 128075. Date of Electronic Publication: 2021 Dec 14. - Publication Year :
- 2022
-
Abstract
- The high-selectivity and high-sensitivity determination of trace concentrations of toxic gases is a major challenge when using semiconductor metal oxide (SMO) gas sensors in complicated real-world environments. In this study, by strategically combining a three-dimensional inverse opal (3DIO) macroporous ZnO substrate and a ZIF-8 outer filter membrane, two series of sensors with Pt NPs loaded at different locations are developed. In the optimal 3DIO ZnO@ZIF-8/Pt sensor, the existence of small Pt NPs in ZIF-8 cavities can effectively accelerate the absorption of H <subscript>2</subscript> S, capture electrons from the N site of ZIF-8, and donate the electron to the S site of H <subscript>2</subscript> S, as indicated by density functional theory simulations, leading to a significantly increased response to H <subscript>2</subscript> S. Together with the molecular-sieving effect that ZIF-8 exerts on gas molecules with larger kinetic diameters, the 3DIO ZnO@ZIF-8/Pt sensor exhibits a high response to H <subscript>2</subscript> S (118-5.5 ppm), a detection limit of 40 ppb, and importantly, a 59-fold higher selectivity to H <subscript>2</subscript> S against typical interference gases. In addition, the 3DIO ZnO@ZIF-8/Pt sensor is developed as a multi-platform sensor to evaluate trace concentrations of H <subscript>2</subscript> S in meat quality assessment, halitosis diagnosis, and automobile exhaust assessment.<br /> (Copyright © 2021 Elsevier B.V. All rights reserved.)
- Subjects :
- Gases
Oxides
Semiconductors
Nanoparticles
Zinc Oxide
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3336
- Volume :
- 426
- Database :
- MEDLINE
- Journal :
- Journal of hazardous materials
- Publication Type :
- Academic Journal
- Accession number :
- 34959212
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2021.128075