Figure 2.

Optical absorption spectra. Gold nanostructures on the surface prepared using several Ag+ concentrations, namely (a) 0, (b) 10, (c) 20, (d) 30, (e) 40 and (f) 50 μM. Other reagents were kept unchanged as that in Figure 1. Growth time was 4 h.

Umar et al. Nanoscale Research Letters 2012 7:252   doi:10.1186/1556-276X-7-252
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