Bifunctional MOFs-Based Ratiometric Electrochemical Sensor for Multiplex Heavy Metal Ions

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Metal-organic frameworks (MOFs) offer tunable properties for sensing applications.
• Multiplex detection of metal ions is crucial for environmental and biological monitoring.
• Ratiometric sensing strategies enhance accuracy by providing internal calibration.

Purpose of the Study:

• To develop a ratiometric electrochemical sensor for simultaneous detection of multiple metal ions.
• To utilize bifunctional metal-organic frameworks (MOFs) integrating signal tags and a detection probe.
• To achieve a robust and sensitive sensor system with improved signal-to-noise ratio.

Main Methods:

• Fabrication of bifunctional MOFs with integrated signal tags.
• Utilizing ion-exchange reactions within MOFs for signal generation.
• Employing ratiometric electrochemical measurements with Cu2+ as an internal reference.

Main Results:

• The sensor successfully detected multiplex metal ions with high sensitivity and selectivity.
• The ratiometric approach (Imetal ions/ICu) effectively eliminated environmental interference.
• The MOF-based sensor demonstrated excellent reproducibility and stability.

Conclusions:

• The developed ratiometric electrochemical sensor based on MOFs is a promising tool for multiplex metal ion detection.
• The sensor's design offers simplicity, high performance, and potential for practical applications.
• This approach provides a robust platform for developing advanced electrochemical sensing systems.