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. 2021 Mar 5;6(10):7034–7046. doi: 10.1021/acsomega.0c06321

Figure 2.

Figure 2

Controlled growth of Ag on Au@SiO2 cores in water. (a) Schematic representation of the Ag overgrowth with increasing AgNO3 concentration, leading to an increased Ag shell thickness. From left to right: (b) HAADF-STEM and (c) EDX intensity maps of single and (d) multiple Au@Ag@SiO2 core–shell nanorods grown with 0.05, 0.13, 0.22, and 0.30 mM AgNO3. (e) Atomic Ag fraction (XAg) of the core–shell nanorods synthesized with 0–0.33 mM AgNO3 as determined from TEM size measurements (red) and EDX quantification (blue). (f) Extinction spectra of the Au@Ag@SiO2 NRs grown with various 0–0.33 mM AgNO3. See Table S2 for the full set of experimental details.