A magnetic plasma Fe3O4@Cu@Cu2O photoelectrochemical sensor for the detection of fumonisin B1

Abstract

Fumonisin B1 (FB1) is a mycotoxin, a water-soluble metabolite produced by Fusarium cepacia, which mainly contaminates grain and its products and is acutely toxic and potentially carcinogenic to certain domestic animals. In this work, plasma nanocomposites of Fe₃O₄@Cu@Cu₂O with magnetic and optoelectronic properties were synthesized as a sensing platform. On one hand, the surface plasmon resonance (SPR) of metallic Cu accelerates the electron transfer rate. On the other hand, plasma-induced resonance energy transfer of metals and semiconductors can improve the utilization efficiency of light energy. A split photoelectrochemical (PEC) sensor based on Fe₃O₄@Cu@Cu₂O was proposed for the detection of FB1. The sensor has a wide linear range of 1.0–10 000 pg mL⁻¹ and a low detection limit of 0.28 pg mL⁻¹ (LOD, S/N = 3), which can realize the specific detection of FB1 in real samples.