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. 2011 Aug 18;6(3):98–104. doi: 10.1116/1.3622481

Fig. 5.

Fig. 5.

XPS high-resolution S2p spectra from NH2-SAMs on 24 nm AuNPs that were purified after 21 days of ligand-exchange for samples analyzed— (a) before adding HCl, (b) after adding 24 drops of the HCl solution but before rinsing, and (c) after adding 24 drops of the HCl solution and rinsing.