An ultra sensitive fluorescent nanosensor for detection of ionic copper

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Development of sensitive and selective chemosensors is crucial for environmental monitoring and biological analysis.
• Fluorescent sensors offer advantages like high sensitivity and real-time detection capabilities.
• Trace metal ion detection, particularly copper(II) (Cu2+), is of significant environmental and health concern.

Purpose of the Study:

• To develop a stable and ultra-sensitive nano-scale fluorescent chemosensor for trace amounts of Cu(2+).
• To investigate the performance of a Cu(2+)-selective fluoroionophore (DMK-7) encapsulated in polymeric nanofibers.
• To evaluate the enhanced photophysical properties and sensing capabilities of DMK-7 when embedded in electrospun nanofibers.

Main Methods:

• Fabrication of sensing membranes as nanofibers and thin films using ethyl cellulose encapsulation of DMK-7.
• Characterization of photophysical properties including absorbance, Stoke's shift, fluorescence quantum yield, and photostability.
• Sensing performance evaluation using steady-state and time-resolved fluorescence spectroscopy.

Main Results:

• DMK-7 exhibited enhanced photophysical characteristics when embedded in ethyl cellulose nanofibers compared to solution phase.
• The developed sensor demonstrated ultra-sensitive detection of Cu(2+) with a detection limit of 3.3×10(-13) M over a wide concentration range.
• The sensor showed high selectivity for Cu(2+) ions over a broad spectrum of other common cations.

Conclusions:

• The DMK-7-doped electrospun nanofibrous material represents a novel and highly effective sensor for trace copper detection.
• The nano-scale fluorescent sensor offers superior sensitivity, selectivity, and stability for Cu(2+) ion analysis.
• This work provides a promising platform for developing advanced fluorescent nanosensors for environmental and analytical applications.