Sensitive photoelectrochemical aptasensing of Salmonella enteritidis based on AgBiS2 and Ag/g-C3N4 with gold nanoparticles

[Display omitted] •A novel photoelectrochemical aptamer sensor was successfully constructed.•The work conditions of the aptamer sensor based on AgBiS2/Ag/g-C3N4 were optimized.•The aptamer sensor has good detection specificity, stability, and reproducibility. In this paper, an ultrasensitive photoelectric chemical sensor based on AgBiS2 and Ag/g-C3N4 was prepared for the detection of Salmonella enteritidis (SE). The AgBiS2 and Ag/g-C3N4 were modified on FTO by layer modification to increase the photoelectric activity of the electrode, the gold nanoparticles continued to be modified, and the aptamer of SE was fixed by AuS bond to realize the specific detection of SE. Compared with the AgBiS2-modified electrode, the electrode prepared by the composite material produced a significantly enhanced and stable photocurrent signal under Xe lamp irradiation. The detection limit of sensor was 2.18 CFU/mL, and ideally, the concentration of SE detection would show a good linear relationship between 6.72 × 103 CFU/mL and 6.72 × 108 CFU/mL. The constructed photoelectrochemical sensor has strong sensitivity, wide linear range, and good selectivity for potential pathogenic bacteria. Therefore, this study provides a very promising photoelectric chemical platform for the detection of SE.