Figure 3

SPR spectra measured every 10 min throughout the Ag NW synthesis. SPR spectra obtained from the reaction after (a) 5 min, (b) 15 min, (c) 25 min, (d) 35 min, and (e) 60 min (inset figures: the Ag nanostructures, at the initial reaction step, existed as Ag particles of 40 to 50 nm in diameter, and after 60 min, these Ag particles were converted into a 1-D structure approximately 30 nm in diameter).