Figure 4.

Optical absorption spectra. Gold nanostructures on the surface prepared using optimum AgNO3 concentration namely 20 μM, with several CTAB to HMT ratio (millilitre to millilitre). (a) 20:0, (b) 18:2, (c) 15:5, (d) 12:8, (e) 10:10, (f) 8:12, (g) 5:15 and (h) 0:20. Other chemicals were unchanged, namely 0.5 mL of 0.01 M and 0.1 mL of 0.1 M for HAuCl4 and ascorbic acid, respectively.

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