Figure 5.

Histograms indicating the change in peak heights of the 780 cm-1 band with reaction time. The peak heights were measured from the SERS spectra of 200 μg·l-1 arsenate on the Ag/GL substrates prepared in (A) 1/0.5 mM, (B) 5/2.5 mM, and (C) 10/5 mM AgNO3/BuNH2 ethanolic solutions with different reaction times.

Hao et al. Nanoscale Research Letters 2011 6:263   doi:10.1186/1556-276X-6-263
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