A Novel Photoelectrochemical Sensor for Thiamphenicol Based on Porous Three-Dimensional Imprinted Film

In this study, we designed a novel photoelectrochemical (PEC) sensor for thiamphenicol (TAP), which based on porous graphene (P-r-GO), MoS 2 nanoflower, dendritic Pt-Pd NPs (Pt-Pd NPs), amino multi- walled carbon nanotubes (NH 2 -MWCNTs), molecularly imprinted polymer (MIP) and L-shape glassy carbon electrode (L-GCE). Firstly, MoS 2 and P-r-GO nanoflower composite was prepared by one-step hydrothermal method. Then, this composite suspension was coated on L-GCE surface to virtually form a porous interface. After that, the suspension of Pt-Pd NPs and NH 2 -MWCNTs was dropped onto MoS 2 -P-r-GO / L-GCE. Subsequently, TAP was imprinted on above modified electrode by cyclic voltammetry as o-phenylenediamine was monomer. Afterwards, ascorbic acid was selected as a photocurrent probe when TAP was removed from MIP film and adsorbed on sensing surface. The resulting PEC sensor possessed excellent response for TAP, and its linear range was 1.0 × 10 -9 ~ 3.5 × 10 -6 mol L -1 with the detection limit of 5.0 × 10 -10 mol L -1 . This sensor was used to determine TAP in real food samples with favorable results.