Solid-state electrochemiluminescence sensor based on zeolitic imidazolate framework-67 electrospinning nanofibers for...

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Chlorpyrifos (CPF) is a widely used organophosphate pesticide with significant environmental and health concerns.
• Developing sensitive and selective detection methods for CPF is crucial for monitoring and risk assessment.
• Solid-state electrochemiluminescence (ECL) sensors offer advantages in sensitivity, selectivity, and portability for analyte detection.

Purpose of the Study:

• To develop a novel solid-state electrochemiluminescence (ECL) sensor for the sensitive detection of chlorpyrifos (CPF).
• To investigate the performance of zeolitic imidazolate framework-67 electrospinning nanofibers (ZIF-67 NFs) as a component in ECL sensors.
• To explore the synergistic effects of silver nanoparticles (Ag NPs) and ZIF-67 NFs in enhancing ECL sensor performance.

Main Methods:

• Fabrication of a modified electrode by successively depositing Ag NPs, ZIF-67 NFs, tris(2,2'-bipyridyl) ruthenium(II) [Ru(bpy)₃²⁺], and Nafion onto an electrode surface.
• Utilizing the ECL properties of the modified electrode in a phosphate-buffered saline (PBS) solution.
• Investigating the quenching effect of CPF on the ECL signal and establishing a calibration curve.

Main Results:

• The modified electrode exhibited a stable and strong ECL signal.
• CPF effectively quenched the ECL signal, with the quenching intensity linearly correlated to the logarithm of CPF concentration over a wide range (1.0 × 10^-13 to 1.0 × 10^-6 M).
• The sensor achieved a low detection limit of 3.3 × 10^-14 M (S/N = 3), demonstrating high sensitivity.

Conclusions:

• The developed ZIF-67 NF-based ECL sensor is highly effective for the sensitive and quantitative detection of CPF.
• ZIF-67 NFs serve as an excellent ECL promoter, broadening their application scope.
• This work presents a promising platform for the development of advanced electrochemical sensors for pesticide detection.