go to Google scholar search gold cluster, I remember some paper on Chem Mater.
You may read the following article:
Lin et. al. Journal of Medical and Biological Engineering, 29(6): 276-283, 2009. May be helpful for you.
A lot of publications, see samples:
Article Different Sized Luminescent Gold Nanoparticles
Article Luminescent gold nanoparticles: A new class of nanoprobes fo...
There are several papers on fluorescent gold clusters and perhaps even more on silver. For gold, there appears to be a very narrow size range (below 2nm) where the fluorescence is strong enough to be easily visible with the naked eye. Nevertheless, quantum yields tend to be low (approx. 1%). I am not aware of any reports on the fluorescence of ligand free gold clusters, so it is still hard to say if the fluorescence stems from ligand-core interactions or if it is entirely due to the properties of the metal cluster alone. In this sense, I believe the question is still open whether something like a "dye" is needed or not.
Thank you Mr. Mathias for your nice answer. Hope lot of discussions still needed in this regard.
Mathias is an expert in synthesis of Gold nanoparticles. I am sure he can answer your question.
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