Silver nanoparticles (AgNPs) have been extensively used as a potent reagent to enhance the Raman scattering of surface-enhanced Raman spectroscopy (SERS) due to their excellent stability and enhancing properties. In a recent publication by Nano Convergence, a more eco-friendly and efficient method of in-situ manufacturing of SERS substrates with AgNPs has been reported.
Methodology:
A unique approach of single microdroplet-based self-assembly of block copolymers (bCPs) was applied to create organic thin-films with Ag NPs doped into them on a paper surface for the first time. The self-assembly of these copolymers was carried out at the interface between air and a liquid droplet deposited on the paper substrate, using a minute amount of the reactants. These materials also served the dual function of promoting the deposition of Ag NPs and stabilizing the microdroplets on the paper surface. Scanning electron microscopy (SEM) was used to analyze the morphological features of the AgNPs, revealing an average size of 47.5nm that conferred the plasmonic characteristics on the paper surface.
Results:
The researchers evaluated the sensitivity of their new nanohybrid plasma paper substrate by recording the SERS spectra of Rhodamine 6G (R6G) in aqueous solution. The limit of detection (LOD) was found to be 48.9 pM. The nanohybrid plasma paper was also tested to detect two new emerging pharmaceutical contaminants, Sildenafil (SD) and Fluobenzenamine (FLBN). The LOD for these two drugs was found to be 1.48nM and 3.45nM, respectively.
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