Fig. 1: Fabrication scheme and morphology characterization.
a Schematic of the fabrication process. b Top-view and c side-view scanning electron microscope (SEM) images of Pd \({{\rm{NP}}}_{15}^{50}\). Scale bars correspond to 500 nm. d Cross-sectional SEM image and EDS elemental maps of \({{\rm{NP}}}_{5}^{50}\) showing a metal cap formed on the top surface of a PS nanosphere. Scale bars correspond to 500 nm. e Magnified views (150 nm × 150 nm) of ultra-high resolution SEM micrographs (in Supplementary Fig. 8) showing morphology differences of Pd NP with different deposited thickness (tPd) of 1.5 to 15 nm.
