Figure 3.

SERS analysis of Cu(PAR)2 and methylene blue. SERS spectra (employing the 532-nm laser line) of methylene blue adsorbed on (curve A) the rapid PEG-reduced (peg_r), (curve B) the hydroxylamine-reduced (hya), and (curve C) the citrate-reduced (cit) silver sol and of Cu(PAR)2 adsorbed on (curve D) the rapid PEG-reduced (peg_r), (curve E) the dropwise PEG-reduced (peg_s), (curve F) the hydroxylamine-reduced (hya), and (curve G) the citrate-reduced (cit) silver sol. The spectra were shifted for clarity. Specific vibrational peaks of analyte molecules are clearly visible for all three classes of silver colloids.

Stiufiuc et al. Nanoscale Research Letters 2013 8:47   doi:10.1186/1556-276X-8-47
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