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yellow color usually suggests a diameter less than 2 nm
red color usually corresponds to a size range of 5-50 nm (roughly)
violet color means a larger size or even aggregates.

Still, it is better you measure the absorption spectra to define the position of SPR; measure the size by DLS and/or TEM. These should be the standard way to characterize metal nanoparticles.
4Â¥2012-07-27 00:10:05
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