Fig. 1. Fabricating procedure of high-surface-roughness silver nanowires and detecting procedure of R6G molecule from aqueous solutions by using high-surface-roughness silver-nanowire SERS substrates. (a) Clean quartz glass substrate; (b) evaporation of silver electrodes; (c) evaporation of conductor RbAg4I5 film; (d) imposition of direct-current electric field; (e) titration of R6G molecule solutions; (f) Raman detection

Fig. 2. Macrograph of high-surface-roughness silver nanowires

Fig. 3. Lengths and numbers of silver-nanowire grids. (a) r=1 cm, N(r)=13; (b) r=0.5 cm, N(r)=40; (c) r=0.25 cm, N(r)=113; (d) r=0.125 cm, N(r)=324; (e) r=0.0625 cm, N(r)=1196

Fig. 4. Fractal dimension of dendritic silver nanowires

Fig. 5. SEM images, diameter distribution, and EDS pattern of high-surface-roughness silver nanowires. (a)-(d) SEM images; (e) diameter distribution; (f) EDS pattern

Fig. 6. Raman spectra of R6G molecule solutions with different concentrations when high-surface-roughness silver nanowires are used as SERS substrates