Visible light photoelectrochemical sensor based on Au nanoparticles and molecularly imprinted poly(o-phenylenediamine)-modified TiO2nanotubes for specific and sensitive detection chlorpyrifos

摘要: A molecular imprinted polymer thin film for photoelectrochemical (PEC) sensing of chlorpyrifos molecules was first constructed by electropolymerizing the o-phenylenediamine (o-PD) monomer and template molecule on gold nanoparticles-modified titanium dioxide nanotubes. The resulting PEC sensors were characterized scanning electron microscopy, ultraviolet (UV)-vis spectra electrochemical impedance spectra. Clearly, showed high selectivity to in our case. Under visible light irradiation, poly(o-phenylenediamine) (PoPD) can generate photoelectric transition from highest occupied orbital (HOMO) lowest unoccupied (LUMO), delivering excited electrons AuNPs, then conduction band (CB) nanotubes (TiO2 NTs). Simultaneously, it is believed that a positively charged hole (h+) PoPD took part oxidation process consumed promote amplification photocurrent response. optimal experimental conditions, photocurrents proportional concentrations ranging 0.05 10 μmol L−1 with detection limit 0.96 nmol L−1. sensor had an excellent specificity could be successfully applied reduced green vegetables, indicating promising application sensing.