Novel Photoelectrochemical Sensors Based On Molecular Imprinted Polymer-modified Probes For The Detection Of Environmental Contaminants

The 21th century is a rapidly developmental era,when people have higher requirements on quality and pace of life.To enhance production quality and storage time of agricultural products,large numbers of chemical reagents are used in the food production process.Environmental problem has become the most prominent problem.It may restrict development of the society,arouse the potential danger for the health of humans.In recent years,many attentions have been paid on food safety,environmental pollution problems.Therefore,to develop a simple,sensitive,and repaid method for the detection of environmental contaminants in various environmental samples has become increasingly important.Compared with traditional detection methods,photoelectrochemical（PEC）detection has several advantages,such as,the equipment is simple and price of the equipment is low,materials are environmentally friendly.PEC detection has caused wide public concern over the recent years.Based on the above understanding,the following research has been done in this thesis:1.The copper ion imprinted film was fabricated on the TiO₂/FTO electrode by photopolymerization.Synthetic materials and modified electrode were characterized by Fourier transform infrared spectrometer（FTIR）,Scanning microscope（SEM）and Electrochemical impedance spectrometer（EIS）,respectively.By studying PEC performances of the sensor,we have found that the sensor has good recognition effect on copper ion.And moreover,it can be used to monitor copper ion in the real samples.2.Screen printing technique is a technology which has long history and mature development.Screen-printed electrode（SPE）was fabricated on the polyethylene glycol terephthalate（PET）substrate by screen printing technique.Bismuth oxyiodide flake arrays（BiOINFs）was prepared via successive ionic layer adsorption and reaction（SILAR）.And then,by combining molecular imprinting technique,we fabricated a highly sensitive and selective PCE sensor,using molecularly imprinted polymers（MIPs）modified BiOINFs/SPE.The as-prepared sensor will provide a approach for the detection of PFOS in real samples.3.Based on the second part,highly integrated SPE was prepared via screen printing technology.Working electrode（WE）,counter electrode（CE）and reference electrode（RE）were integrated on this electrode.Size of sensor will be greatly reduced by using these kinds of electrode.A photoelectrochemical（PEC）sensor for perfluorooctanoic acid（PFOA）on SPE was obtained based on the molecular imprinting technique and electropolymerzation.The resulting sensor exhibits reject response these interference,such as,pentachlorophenol（PCP）,perfluoropropioic acid（PFPA）,perfluorohexanoic acid（PFHA）and some other organic compounds.It can be used for the analysis of PFOA in environmental samples.