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. 2009 May 7;1(5-6):345–362. doi: 10.1039/b905502a

Fig7.

Fig7

(A) Aggregation of silver seed nanoparticles and Raman labels in silver nitrate produce composite organic–inorganic nanoparticles shown in the TEM in (B). (C) Raman spectra of the COINs, showing particular dominant peaks, whose Raman shift depends on the particular organic Raman label used. The dominant peak position constitutes the code identifying the COINs. (D) Use of more than one Raman label produces spectra with multiple peaks, the combinations of which allow for increased numbers of codes (adapted with permission from ref. 37, copyright 2005, American Chemical Society).