Open AccessSERS substrates based on silver nanoparticles and graphene oxide
Author(s) -
R.Kh. Dzhanabekova,
N. Kh. Ibrayev
Publication year - 2020
Publication title -
ķaraġandy universitetìnìn̦ habaršysy. fizika seriâsy/ķaraġandy universitetìnìņ habaršysy. fizika seriâsy
Language(s) - English
Resource type - Journals
eISSN - 2663-5089
pISSN - 2518-7198
DOI - 10.31489/2020ph1/18-25
Subject(s) - rhodamine 6g , graphene , materials science , silver nanoparticle , raman spectroscopy , raman scattering , nanoparticle , oxide , rhodamine b , nanotechnology , scanning electron microscope , chemical engineering , rhodamine , surface plasmon resonance , colloid , molecule , photocatalysis , composite material , chemistry , optics , fluorescence , organic chemistry , physics , engineering , metallurgy , catalysis
Simple work methods for preparing active coatings for surface-enhanced Raman scattering (SERS) are demonstrated in the article. SERS active films of colloidal silver nanoparticles and composites based on graphene oxide and silver nanoparticles were obtained. The prepared disperse solutions of silver nanoparticles and graphene oxide/Ag nanoparticles composites have different stability. Using a scanning electron microscope, the structure of the prepared films was studied. A comparative characteristic of the obtained SERS active substrates is given. The dye Rhodamine 6G was used as the test substance. It was shown that the smallest enhancement of the Raman signal is produced by a coating of colloidal silver nanoparticles, while the graphene oxide/Ag nanoparticles composite obtained by the 2-stage method provides the greatest gain. The different ability to amplify the Raman signal is explained by the difference in the structure and composition of the obtained SERS active films. All prepared coatings make it easy to detect low dye concentrations (from a 10–6 M solution) both with resonance (532 nm) and nonresonance (632.8 nm) excitation.