Fig. 2: Colloidal synthesis and self-assembly of Ag shelling on Au octahedral nanoparticles. | Nature Communications

Fig. 2: Colloidal synthesis and self-assembly of Ag shelling on Au octahedral nanoparticles.

From: Ensemble hot-spots in 3D supercrystals of plasmonic octahedral nanoparticles in tip-to-tip configured superlattices

Fig. 2

a Scheme of experimental set-up for colloidal Ag shelling controlled by CTAC concentration, injection rate (ml min−1) of Ag precursors, and ascorbic acid. b Figure of cubicity (Cn) of edge length (L), corner diameter (D) for Au octahedra@Ag shell, and (c) TEM image of Ag shells on Au octahedra corresponding to cubicities of 0.31, 0.42, 0.68, and 0.80, respectively (scale bar = 20 nm). d Plots of Au octahedra@Ag outer shell morphology controlled by CTAC concentration and injection rate of Ag precursor (5 mM) and ascorbic acid (0.1 M). SEM images of close-packed Au octahedra@Ag shell assemblies with cubicities of (e) 0.31, (f) 0.42, g 0.68, and h 0.80, and corresponding FFT pattern (scale bar = 0.1 μm−1) and particle distributions of cubicity. i Low-magnified SEM images of Au octahedra@Ag nanocube supercrystals (inset shows the cubic habits). Source data are provided as a Source Data file.

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