A linear fluorescence-quenching response in an amidine-functionalised solid-state sensor for gas-phase and aqueous...

Area of Science:

• Materials Science
• Chemistry
• Environmental Science

Background:

• Metal-organic frameworks (MOFs) offer tunable properties for sensing applications.
• Selective detection of carbon dioxide (CO2) is crucial for environmental monitoring and industrial processes.
• Developing efficient chemosensors for CO2 remains an active area of research.

Purpose of the Study:

• To investigate the potential of amidine-functionalised MOFs as chemosensors for CO2.
• To demonstrate the selective detection of CO2 in both gaseous and aqueous phases.
• To explore the mechanism of fluorescence quenching in response to CO2.

Main Methods:

• Synthesis of an amidine-functionalised metal-organic framework (MOF).
• Characterization of the MOF's structure and properties.
• Testing the MOF's response to varying concentrations of CO2 in gaseous and aqueous environments.
• Monitoring changes in fluorescence intensity upon CO2 exposure.

Main Results:

• The amidine-functionalised MOF exhibited a significant quenched fluorescence response in the presence of CO2.
• High selectivity for CO2 was observed over other potential interfering gases/analytes.
• The chemosensor demonstrated effectiveness in both gaseous and aqueous phases.
• The fluorescence quenching mechanism was confirmed as the basis for CO2 detection.

Conclusions:

• Amidine-functionalised MOFs are effective and selective chemosensors for CO2.
• The developed MOF-based sensor shows promise for real-time CO2 monitoring.
• Multifunctional MOFs can be strategically designed for advanced sensing applications.