Novel Double Z-Scheme ZnS/Bi 2 S 3 /Bi 2 Ti 4 O 11 Electrospun Heterojunction-Triggered Photocurrent-Polarity-Switching Cathodic Aptasensor for Fumonisin B1 Analysis

作者：Qian Cao, Pengbo Niu, Rui Shi, Hang Gong, Yuchan Ma, Cheng Zhi Huang, Tong Yang · 发表于：Analytical Chemistry · 年份：2025 · DOI：10.1021/acs.analchem.5c05116 · 被引用次数：6 · 研究领域：Advanced Nanomaterials in Catalysis、Advanced Photocatalysis Techniques、TiO2 Photocatalysis and Solar Cells

Agricultural products are usually susceptible to mycotoxin contamination; the rapid and reliable detection of mycotoxins at the early stage is crucial for food safety. Here, a photocurrent-polarity-switchable cathodic photoelectrochemical (PEC) aptasensing platform was established for fumonisin B1 (FB1) analysis based on a novel ZnS/Bi 2 S 3 /Bi 2 Ti 4 O 11 (BTO) electrospun nanoheterojunction. Introducing S/Zn sources on Bi 4 Ti 3 O 12 electrospun nanofibers induced the component transformation of Bi 4 Ti 3 O 12 into BTO to generate ZnS/Bi 2 S 3 /BTO with double Z-scheme heterojunctions, thereby switching from anodic to cathodic photocurrent. On the photocathodic aptasensing interfaces of ZnS/Bi 2 S 3 /BTO, the FB1 aptamer-modified Au NPs/NiCo 2 O 4 as peroxidase-like mimics accelerate the oxidation of 4-chloro-1-naphthol in a H 2 O 2 environment to produce insoluble precipitates, quenching the photocathodic current with a 77.6% quenching efficiency. After incubation with FB1, the specific binding between FB1 and the aptamer could effectively reduce the catalytic sites of Au NPs/NiCo 2 O 4, resulting in the recovery of photocathodic current signals for the detection of FB1 with a linear range of 0.5 pg/mL–1000 ng/mL and a detection limit of 0.385 pg/mL. In a word, this work for the first time synthesized the novel ZnS/Bi 2 S 3 /BTO double Z-scheme electrospun heterojunctions as highly active photocathodic materials, offering a new perspective in the advancing polarity-switch...