Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 10, Issue 8, Pages 2784-2792Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c08119
Keywords
ionic liquids; membrane; fluorescence visualized detection; sulfur dioxide; coumarin
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Funding
- N a t i o n a l Key RAMP
- D Program of Ch ina [2020YFC1712700]
- Research Initiation Fund of Zhejiang University of Technology [2020101005929]
- National Natural Science Foundation of China [22138011, 32122068]
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A novel design strategy using anion-functionalized ionic liquids was presented for the real-time detection of gaseous SO2. The sensor exhibited high sensitivity, selectivity, and reusability.
Presented here is a novel design strategy that utilizes anion-functionalized ionic liquids (ILs) to achieve visual and real-time detection of gaseous SO2. A coumarin fluorophore was innovatively covalently linked onto an IL and exhibited fluorescent signal response for SO2 due to strong chemical interactions. The sensor consisting of this IL displayed high sensitivity and selectivity, even toward trace amounts of SO2 (<0.2 ppm). Furthermore, this sensor overcame weak anti-interference ability and watersensitivity issues. Benefiting from its excellent solubility, the sensor could be assembled into a simple and portable membrane device and exhibited excellent reusability (>12 times). The reported membrane sensor may be used as a next-generation gas sensor with superior SO2-response performance, enabling a wide application for monitoring harmful gases.
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