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Carbon quantum dots fluorescence quenching for potassium optode construction.

Mehdi Rahimi1, Mohamad Mahani1, Zahra Hassani2

  • 1Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Graduate University of Advanced Technology, Kerman, Iran.

Luminescence : the Journal of Biological and Chemical Luminescence
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This study developed a novel potassium ion sensor using carbon quantum dots (CQDs). The CQDs exhibit fluorescence quenching for sensitive potassium detection in real samples.

Keywords:
carbon quantum dotfluorescenceoptodepotassiumquantum yieldquenching

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Carbon nanoparticles, particularly carbon quantum dots (CQDs), are of significant interest for sensing and imaging due to their photophysical properties, biocompatibility, and functionalizability.
  • Fluorescence quenching is a promising mechanism for developing sensitive optical sensors.

Purpose of the Study:

  • To construct a potassium ion optode utilizing the fluorescence quenching properties of carbon quantum dots (CQDs).
  • To evaluate the performance of the developed optode for potassium ion detection.

Main Methods:

  • Carbon quantum dots (CQDs) were synthesized using a microwave-assisted method with citric acid and 2,2'-(ethylene-dioxy)bis(ethylamine).
  • The synthesized CQDs were characterized, and their quantum yield was determined.
  • A potassium ion optode was fabricated based on the fluorescence quenching response of the CQDs.
  • The optode's performance, including linear dynamic range and correlation coefficient, was evaluated.
  • The optode was tested on real samples and compared against an ion-selective electrode.

Main Results:

  • The synthesized CQDs exhibited a quantum yield of 7.1%.
  • The potassium ion optode demonstrated a linear dynamic range of approximately one order of magnitude with a high correlation coefficient (0.99).
  • Application on real samples yielded a low error range of 0.60-1.60% compared to a standard ion-selective electrode.

Conclusions:

  • A functional potassium ion optode was successfully developed using CQDs.
  • The CQD-based optode shows high sensitivity and accuracy for potassium ion detection.
  • This approach offers a viable alternative for potassium ion sensing in various applications.