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Nonuniform Distribution of Capping Ligands Promoting Aggregation of Silver Nanoparticles for Use as a Substrate for SERS

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Figure

Figure 1. (A) TEM image of the original citrate-reduced Ag-NPs prepared by the present method; (B) The size distribution of Ag-NPs with polydispersity
Figure 2. (A) UV-Vis-NIR spectra of an original citrate-reduced Ag-NPs solution (a, Ag-blank), and Ag-NPs aggregated solu-tions after one cycle (b, Ag-1), two cycles (c, Ag-2), three cycles (d, Ag-3), and four cycles (e, Ag-4) of centrifugation, removing t
Figure 4. The mean SERS of citrate group in the concen-
Figure 6. Comparison of SERS spectrum of citrate anions (A) and R6G (B) in the Ag-NPs aggregation aqueous solution (a) or the dried Ag-NPs aggregation on the Si substrate (b)

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