Self-powered photoelectrochemical aptasensor based on in situ topological conversion of Bi2O2S/Bi2S3 for sensitive detection of fumonisin B1

Excessive fumonisin B1 (FB1) can cause serious harm to humans, so it is important to achieve sensitive detection of FB1. In this study, a self-powered photoelectrochemical (PEC) aptasensor for the sensitive detection of FB1 was designed based on a Bi₂O₂S/Bi₂S₃ photoanode and Au@BiOI photocathode. The Bi₂O₂S/Bi₂S₃ prepared by in situ topological transformation has a large number of carrier channels, which improves the charge transfer efficiency. Consequently, the cathodic photocurrent was enhanced, which laid the foundation for the sensitive detection of FB1. Additionally, Au@BiOI as a photocathode sensing platform avoids the false-positive problem (comparison of anode sensing platforms). The aptasensor has a linear detection range of 1 pg/mL ∼ 100 μg/mL with a detection limit as low as 0.10 pg/mL (S/N = 3). This method provides a new idea for the detection of other mycotoxins.