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. Author manuscript; available in PMC: 2021 Dec 8.
Published in final edited form as: Nanoscale. 2020 Dec 8;12(46):23700–23708. doi: 10.1039/d0nr06296k

Fig. 7.

Fig. 7.

(a) LSPR spectra of carboxylated Ag@Au nanoparticles at (1) 10 and (2) 40 mM ionic strengths after 1 hr and (3) 100 and (4) 150 mM after 1 min. (b) LSPR spectra of carboxylated IE Ag@Au@SiO2 nanoparticles at (1) 10, (2) 40, (3) 100, and (4) 150 mM ionic strengths for 1 hr. Incubation conditions: 10 mM EPPS at pH 7. (c) SERS difference spectra for 13.6 μM uranyl at (1) 10, (2) 40, (3) 100, and (4) 150 mM ionic strengths. SERS conditions: λex = 785 nm, tint = 30 s, P = 40 mW, 10 mM EPPS buffer (pH 7). (d) Analysis of ionic strength dependent spectral changes for (red, vertical lines) uranyl and (blue, horizontal lines) carboxylate using carboxylated IE Ag@Au@SiO2 nanoparticles.