Ultrasensitive and visible light-responsive photoelectrochemical aptasensor for edifenphos based on Zinc phthalocyanine sensitized MoS2 nanosheets.

Developing a simple, rapid detection method for the analysis of edifenphos (EDI) is crucial due to its residue is harmful to acetylcholinesterase on the human cellular system, and cause a lot of complications. Herein, we synthesized visible light-responsive MoS 2 nanosheets decorated with Zinc phthalocyanine (ZnPc) nanoparticles (ZnPc/n-MoS 2). Due to the sensitization of ZnPc nanoparticles, the resulting ZnPc/n-MoS 2 exhibited narrower energy bandgap and efficient charge transfer. Especially, the carrier lifetime of ZnPc/n-MoS 2 is 2 more times longer than n-MoS 2 , and the photocurrent intensity of ZnPc/n-MoS 2 is 24 times of n-MoS 2 and 22 times of ZnPc nanoparticles under visible light irradiation. Further, a visible light-responsive ultrasensitive photoelectrochemical (PEC) aptasensor for selectivity recognition of EDI was triumphantly established by using EDI aptamer as a biorecognition element, which exhibited a wide linear ranking from 5 ng L–1 to 10 μg L–1 (R2 = 0.996) and a low detection limit of 1.667 ng L–1 (S/N = 3). The splendid performance of the ZnPc/n-MoS 2 nanosheet ultrasensitive sensing platform can be applied to detect the concentration of EDI in food, biomedical and environmental analysis. • Visible light-responsive ZnPc/n-MoS 2 was fabricated used ZnPc nanoparticles as sensitizer. • The carrier lifetime and photocurrent intensity of ZnPc/n-MoS 2 is 2 more and 24 times of n-MoS 2 , respectively. • A visible light-driven PEC edifenphos aptasensor was firstly successfully established. • The proposed aptasensor exhibited good selectivity and sensitivity for edifenphos detection. [ABSTRACT FROM AUTHOR]