On two site-specific nitrite-sensing nanocomposites having a core-shell structure: Construction, characterization and...

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Nitrite detection is crucial for environmental and biological monitoring.
• Existing methods may lack sensitivity or require complex procedures.
• Nanocomposite materials offer unique properties for sensor development.

Purpose of the Study:

• To synthesize and characterize novel core-shell nanocomposites for sensitive nitrite detection.
• To investigate the sensing mechanism and performance of these nanocomposites.
• To evaluate the regenerability of the nitrite-sensing materials.

Main Methods:

• Synthesis of Fe3O4@MCM-41 core-shell nanostructures.
• Functionalization with rhodamine-based chemosensors.
• Characterization using SEM, TEM, XRD, N2 adsorption/desorption, IR, and TGA.
• Nitrite sensing via fluorescence quenching measurements.
• Regeneration studies using sulphamic acid.

Main Results:

• Successfully synthesized and characterized core-shell nanocomposites.
• Achieved a low limit of detection for nitrite as 1.2μM.
• Demonstrated a static sensing mechanism involving an additive reaction.
• Confirmed effective regeneration of the sensor after nitrite quenching.

Conclusions:

• The developed nanocomposites are effective for sensitive and selective nitrite sensing.
• The core-shell structure and chemosensor integration enable efficient signal transduction.
• The regenerability of the sensor enhances its practical applicability in monitoring.