Browsing by Author "Wang, Haiying"

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  • Layer-by-layer assembly of polystyrene/Ag for a highly reproducible SERS substrate and its use for the detection of food contaminants
    (2021-10-01) Zhang, Sihan; Xu, Zhihua; Guo, Jiaqi; Wang, Haiying; Ma, Yibo; Kong, Xianming; Fan, Hongtao; Yu, Qian
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Polystyrene (PS) spheres were prepared through an emulsifier-free emulsion polymerization method, in which the reaction time, ionic strength, concentrations of copolymer were studied in detail. The resulting PS microspheres and Ag nanoparticles were used to construct a surface enhanced Raman scattering (SERS) substrate by a layer-by-layer assembly method. A relatively uniform distribution of PS/Ag in the films was obtained, and the multilayer substrate presented excellent SERS reproducibility and a tunable enhancement effect. The SERS substrate was used for detecting harmful pesticides (malachite green and dimetridazole) in food samples, with a limit of detection as low as 3.5 ppb. The obtained plasmonic composite has a promising future in the field of SERS sensing.