Electrospun nanofibers containing CdTe@ZnNi-MOF for electrochemiluminescent determination of chlorpyrifos.

Electrospun nanofibers containing CdTe@ZnNi-metal-organic frameworks (CdTe@ZnNi-MOF NFs) were used for the first time in luminol-O2 electrochemiluminescence (ECL) system to construct ECL sensor for chlorpyrifos (CPF) detection. Firstly, CdTe@ZnNi-MOF NFs obtained by blending method was used to modify the surface of a glassy carbon electrode, and then, the proposed solid-state ECL sensor was constructed by dropping luminol onto the surface of nanofiber benefiting from chitosan (CTS) viscosity. CdTe@ZnNi-MOF NFs with its large surface area and porosity can be used not only as luminol carrier but also as co-reaction promoter of the ECL system. The ECL sensor obtained satisfactory results in weakly alkaline solution under the synergistic action of CdTe@ZnNi-MOF NFs and luminol. The constructed ECL sensor can effectively detect CPF in the range 1.0 × 10-14-1.0 × 10-9 M, and the detection limit was 6.23 × 10-17 M (3σ/m). The constructed sensor was simple and sensitive, and can be used for the determination of CPF in vegetable samples. It not only broadened the application of MOFs in the field of ECL but also provided a new idea for expanding the application of the luminol-O2 system.