Green Synthesis of Gold/Silver Hybrid Nanostructures for Surfaceenhanced Raman Scattering Spectroscopy
Tea-gold nanosponges (T-Au NSs), tea-silver nanoparticles (T-Ag NPs), and tea-gold/silver nanosponges (TAu/
Ag NSs) synthesized by mixing a tea infusion with gold (silver) ions were demonstrated. UV-Vis spectroscopy,
transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy
(EDS), and powder X-ray diffraction (XRD) analysis were used to characterize as synthesized nanomaterials. Thereafter,
the potential for use of the T-Au NSs, T-Ag NPs, and T-Au/Ag NSs in surface-enhanced Raman scattering (SERS) applications
was investigated. The T-Au NSs provided a more intense SERS signal than the T-Ag NPs because of extremely
intense local electromagnetic fields. In addition, the SERS enhancement factor for the T-Au NSs was further enhanced
when Ag NPs were adsorbed on their surface.
Keywords: Green synthesis nanostructures, Raman spectroscopy, transmission electron microscopy (TEM), X-ray diffraction.
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