Multistep synthesis of 3D nanostructures.(A) Scheme illustrating the 3D structures of the nanoparticles synthesized at each synthetic step. Yellow, Au; cyan, Ni. (B to I) Scanning TEM (STEM)–energy-dispersive x-ray spectroscopy (EDX) maps and high-angle annular dark-field (HAADF)–STEM images of the nanoparticles after each step in the synthesis. (B and C) Au1 cores synthesized in step I. (D and E) Au1-Ni1 nanoparticle synthesized from Ni branch growth on the Au1 cores in step II. (F and G) Au1-Ni1-Au2 nanoparticle synthesized from Au core growth on the tips of Ni1 branches in step III. (H and I) Au1-Ni1-Au2-Ni2 3D nanostructures synthesized from Ni branch growth on Au2 cores in step IV. Credit: Science Advances (2023). DOI: 10.1126/sciadv.adf6075
Scientists from UNSW Sydney have…