Figure shows the four-step synthesis of nano-Fanowman particles, beginning with thiolated DNA modification of single-crystal AuNPs, followed by gold shell growth to form an intragap within the particles, a subsequent thiolated DNA modification of Au-NNPs, and finally, anisotropic silver body formation. Thiolated DNA oligomers with poly adenine (A10) attach to the surface of nanoparticles, strongly influencing metal deposition and thereby facilitating intragap formation (in Au-NNPs) and anisotropic silver growth (in nanosnowmen). During the gold shell formation step, increasing the salt concentration induced a blueshift of the dark mode. This phenomenon can be explained by the screening effect of sodium ions, which shield the negative charges of the DNA phosphate backbone, allowing gold ions easier access to the core AuNP surface and resulting in an increased number of budding sites (nanobridges) at the intragap (Figure ). Conversely, at low sodium ion concentrations, gold ions bind to DNA oligomers, hindering their access to the core AuNP while relatively accelerating shell formation. In the anisotropic silver growth step, increasing the salt concentration also caused a blueshift of the bright mode. This shift is likely due to chloride ions, which significantly decrease the silver deposition rate on the budding surfaces by making an activation-controlled growth condition (Figure ). Conversely, at low chloride ion concentrations, diffusion-controlled growth occurs within the DNA oligomer forest.