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Abstract: In this study, an ultrasensitive photoelectrochemical (PEC) sensor showing a high selectivity to for chloramphenicol (CAP) was successfully constructed, based on the molecularly imprinted polymers (MIPs) functionalized photoelectrochemically active materials. The 3D flower-like BiOBr with large specific surface area was synthesized by a simple hydrothermal process and was employed as a matrix to graft the MIPs recognition element (denoted as MIPs-PEC). SEM, TEM, FTIR, XPS, XRD and UV-vis spectroscopy were used to investigate the microstructure characteristics of the as-obtained MIPs-PEC sensor. During the PEC sensing process, MIPs were prepared via a simple thermal polymerization process provided numerous recognition sites, which improved the sensor's selectivity to CAP. The results showed that photocurrent response signal generated by photo-induced MIPs/BrOBr/ITO electrodes was proportional to the logarithm of CAP concentration over the range from 1.00 × 10-2 to 1.00 × 10^3 ng mL-1 with a low detection limit is 3.02 pg mL-1 (S/N = 3). MIPs-PEC sensor exhibited high selectivity and stability, low cost, and applicability to the determination of CAP in real samples
Template and target information: chloramphenicol, CAP
Author keywords: chloramphenicol, Photoelectrochemical sensing, Flower-like BiOBr, Molecularly imprinted polymers