Solid-state electrochemiluminescence sensor of CQDs based on ZIFs electrospun carbon fiber for malathion detection

Abstract

In this paper, a novel and simple electrochemiluminescent sensor of CQDs based on ZIFs electrospun carbon fiber was constructed for the detection of malathion. Carbon quantum dots (CQDs) was obtained by pyrolysis of citric acid at high temperature. ZIFs electrospun carbon fiber (ENCF-67) prepared by electrospinning combined with high temperature calcination adsorbed Au NPs to obtain ENCF-67@Au. And the sensor of Nafion/ENCF-67@Au/CQDs/GCE was constructed by sequentially modified CQDs, ENCF-67@Au and Nafion on the electrode surfaces. ENCF-67@Au was used as the fixation material of CQDs and accelerator of system because ENCF-67 had the advantage of large specific surface area and porosity. Nafion/ENCF-67@Au/CQDs/GCE obtained sensitive and stable electrochemical luminescence signal in PBS containing S2O82-. The addition of malathion enhanced the ECL signal of the sensor with a linear increase in the range of 1.0 × 10-12 − 1.0 × 10-7 M and the limit of detection 3.3 × 10-13 M (S/N = 3). The sensor had good selectivity for malathion, which provided a simple and sensitive method for the detection of malathion in fruits and vegetables in real life and had potential applications.