(A) Scanning electron microscopy (SEM) images of Ag NFs. (B) Raman spectra of 10 mM R6G (below) and 0.05 mM R6G (above) moleculesadsorbed on flowerlike Ag nanostructures taken at 785 nm excitation and the same collection time. Adapted from ref. 42 with permission from Elsevier.(C) Schematic diagram of fabricating Au NF–Ag NP core–satellite nanostructures to detect microcystin-LR (MC-LR). Transmission electron microscopy(TEM) images of (D) Au NFs. (E) Enlarged Au NFs from (D). (F) Au NF–Ag NP core–satellite assemblies in 0.05 nM MC-LR. The inset shows the enlargedTEM image and the scale bar is 20 nm. Adapted from ref. 43 with permission from The Royal Society of Chemistry