| Surface-enhanced Raman scattering?SERS?has become a powerful method for detecting trace components as it has a very broad development prospect in the environmental field due to its intrinsic properties,such as high sensitivity,wide detection range,non-destructive,fast and non-polluting.In this thesis,three SERS substrates were prepared,modified,and used for the detection of target contaminants.The main findings are as follows:?1?A polytrifluoropropylmethylsiloxane?PTFPMS?/silver composite SERS substrate was prepared by combining sol-gel method and in-situ reduction method,then further modified with 3-aminopropyltriethoxysilane?APTES?.It was found that with the modified PTFPMS film as SERS substrate,which was doped with 20%APTES and immersed in 0.2mM silver nanoparticles for 24 hours,nitrobenzene which was served as target pollutant can be detected at 8×10-5M.?2?A polystyrene?PS?/silver composite SERS substrate was successfully prepared by combining electrospinning and in situ reduction,then probe molecule p-ATP was utilized to explore the surface enhancement.After that,typical cyclic aromatic compounds,i.e.nitrobenzene,was investigated.It was found that the spinning solution with PS mass fraction of 10%and doped with 0.05 g of silver nitrate before in-situ reduction has the best Raman effect for probe molecule p-ATP.The prepared polystyrene/silver SERS substrate can be used to detect the target pollutant nitrobenzene at 8×10-44 M.?3?A polyvinyl alcohol?PVA?/silver composite SERS substrate was successfully prepared by electrospinning and in-situ reduction.Original PVA fibers were extremely soluble in water,however,after heat treatment,it was found that the treated fibers became nearly insoluble in water.After investigation,it was found that the heat-treated PVA spun fiber had a good SERS effect for 10-5M methylene blue after loading silver nanoparticles by immersed in 6 mM silver nitrate and 30 mM sodium borohydride solution for 30 s. |
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