A spin-state switchable MOF-based film for visual DMSO vapor sensing
Yuwei Shen1, Soraya Bouras1, Latévi Max Lawson Daku2
1Institut des Matériaux Poreux de Paris, UMR 8004 CNRS, Ecole Normale Supérieure, ESPCI Paris, PSL University, 75005 Paris, France. antoine.tissot@ens.psl.eu.
Dalton Transactions (Cambridge, England : 2003)
|November 3, 2025
Summary
Researchers developed a new reusable sensor for detecting harmful volatile organic compounds (VOCs). The sensor uses a novel composite material that changes color in response to dimethyl sulfoxide (DMSO) vapor.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Volatile organic compounds (VOCs) pose significant health risks.
- Development of effective VOC detection methods is crucial.
- Colorimetric sensors offer a promising approach for real-time monitoring.
Purpose of the Study:
- To fabricate a novel colorimetric sensor for VOC detection.
- To investigate the sensor's response to dimethyl sulfoxide (DMSO) vapor.
- To explore the integration of spin crossover complexes within metal-organic frameworks (MOFs).
Main Methods:
- Fabrication of a composite film using [Fe(Sal2trien)]NO3 embedded in MOF nanocrystals.
- Exposure of the composite material to DMSO vapor at room temperature.
- Observation of colorimetric changes and spin state switching (high-spin to low-spin) of Fe(III) centers.
Main Results:
- The composite material exhibited a selective and reversible colorimetric response to DMSO vapor.
- Detection of DMSO down to 15 ppmv was achieved.
- The color change is attributed to DMSO-induced spin state switching.
Conclusions:
- The integrated spin crossover complex within MOFs shows potential for reusable VOC sensors.
- This approach offers a new pathway for developing sensitive and selective chemical sensors.
- The study highlights the utility of MOF-based materials for environmental monitoring applications.
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