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(a) A color contour plot of the near-field distribution for a Ag nanoparticle arrays. (b) Enhancement factor vs for the nanoparticle arrays of different diameters. (c) A color contour plot of the near-field distribution for a flowerlike pattern. (d) Same size of flower as (c) with additional nanoparticles .
The SEM images for different Ag nanostructures synthesized at applied potential, (aq) concentration, and reaction time. (a) Nanoparticles arrays, , , and . (b) The particle size and interparticle gap between nanoparticles of (a). (c) Nanoparticle pattern, , , and . (d) High density flowers, , , and . (e) pattern, , , and . (f) Flower pattern, , , and .
SERS spectral comparison of Ag nanoparticles arrays (sample a in Fig. 2) and flowerlike patterns (samples c, d, e, and f in Fig. 2). A quantitative enhancement comparison is shown as insets. (Excitation power of , excitation length of , charge-coupled device (CCD) detector, scan time of .
(a) A magnified flower in Fig. 2(d). (b) A magnified model pattern in Fig. 1(d). [(c) and (d)] A magnified leaves area from (b).
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