Magnetic-assisted exciton-plasmon interactions modulated Bi2S3 nanorods@MoS2 nanosheets heterojunction: towards a split-type photoelectrochemical sensing of profenofos

A split-type photoelectrochemical ( PEC) sensor was designed for the detection of profenofos (PFF) depending on the magnetic-assisted exciton-plasmon interactions ( EPI) between the semiconductor substrate and Au NPs. The core-shell Bi2S3 nanorods@MoS2 nanosheets (Bi2S3 NRs@MoS2 NSs) heterostructure nanomaterial with fascinating performance was synthesized and used as the photovoltaic conversion substrate and signal molecules absorption platform. The PEC sensor is operated by co-incubating with the released Au NPs-cDNA from the surface of magnetic beads, originating from the target-triggered DNA double- stranded structure opening event. Due to the strong EPI effects, the photocurrent of Bi2S3 NRs@ MoS2 NSs decreased and varied with the PFF concentrations. The proposed PEC sensor exhibited outstanding analytical performances, including a wide linear range (1.0 pg mL(-1)similar to 1.0 mu g mL(-1)), low detection limitation (0.23 pg mL(-1), at 3 sigma/m), excellent specificity, high stability, and applicability. Overall, this work provides a new signal strategy for PEC biosensors and extends its application in environmental analysis.

Automated summary

A split-type photoelectrochemical (PEC) sensor was designed using magnetic-assisted exciton-plasmon interactions (EPI) to detect profenofos (PFF). Core-shell Bi2S3 nanorods@MoS2 nanosheets (Bi2S3 NRs@MoS2 NSs) heterostructure nanomaterial with excellent performance was synthesized and utilized as the photovoltaic conversion substrate and signal molecules absorption platform. The proposed PEC sensor demonstrated outstanding analytical performances, including a wide linear range, low detection limitation, excellent specificity, high stability, and applicability. Furthermore, it provided a new signal strategy for PEC biosensors and extended their application in environmental analysis.