Layer-by-layer assembly of polystyrene/Ag for a highly reproducible SERS substrate and its use for the detection of food contaminants

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-10-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Polymers, Volume 13, issue 19
Abstract
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.
Description
Funding Information: The authors would like to acknowledge the support from the Science Research Project of Education Department of Liaoning Province of China (No. L2019011) and the talent scientific research fund of LSHU (No. 2017XJJ-037). Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
Ag nanoparticle, Layer by layer, Polystyrene, Reproducibility, Self-assembly, SERS
Other note
Citation
Zhang, S, Xu, Z, Guo, J, Wang, H, Ma, Y, Kong, X, Fan, H & Yu, Q 2021, ' Layer-by-layer assembly of polystyrene/Ag for a highly reproducible SERS substrate and its use for the detection of food contaminants ', Polymers, vol. 13, no. 19, 3270 . https://doi.org/10.3390/polym13193270