Synthesis of nano silver coating for surface-enhanced Raman scattering application for methylene blue detection

Abstract

    Surface-enhanced Raman scattering is one of the methods that is attracting a lot of interest in the field of sensing. The efficient use of the electromagnetic field on the surface of precious metal nanoparticles resulting from the LSPR effect is one of the leading solutions to improve the sensitivity of this method. Polygonal silver nanoparticles with controlled shape and size achieve high homogeneity by chemical reduction. Based on the good binding ability between silver and amine groups, the self-aligning monolayer coating method on glass substrate was used in this study with the aim of enhancing the SERS signal of the substrates and improving the stability of the SERS substrate. Methylene blue was used in this study as an analyte. The detection limit of glass/Ag substrate calculated for methylene blue was ~ 10⁻⁸ M corresponding to the calculated enhancement factor of ~ 10⁸ times. This is an affirmation of the feasibility of applying SERS in clinical sensors to quickly and simply detect toxic organic substances in the food and environmental fields.