Fig. 4: The enantioselective synthesis of helicoid Au@Pd NPs. | Nature Communications

Fig. 4: The enantioselective synthesis of helicoid Au@Pd NPs.

From: Enantioselective synthesis of chiroplasmonic helicoidal nanoparticles by nanoconfinement in chiral dielectric shells

Fig. 4

a Schematic illustration for the synthesis of helicoid Au@Pd NPs. The yellow, blue, and translucent models represent the Au NP, Pd-based NPs, and chiral SiO2 nanoshells, respectively. b, c SEM images of (b) L- and (c) D-helicoid Au@Pd NPs. d–i SEM images of individual (d–f) L- and (g–i) D-helicoid Au@Pd NPs viewed from the (d, g) [100], (e, h) [111], and (f, i) [110] axes. j The g-factor and normalized extinction spectra of L- (blue) and D-helicoid Au@Pd NPs (pink). k–o, (k) HAADF-STEM image and (l–n) corresponding EDX elemental mapping of a single helicoid Au@Pd NP. The red and blue colors denote Au and Pd, respectively. o EDX linear scan profiles of Pd (blue) and Au (red) corresponding to the red line in (k). p–r TEM image of a single helicoid Au@Pd NP, (q) corresponding SAED pattern, and (r) HRTEM image of edge-on surface corresponding to the red box in (p). Scale bars: b, c 200 nm. d–i 100 nm. k–n 100 nm. p 50 nm. q 5 nm−1. r 2 nm. Source data are provided as a Source Data file.

Back to article page