Can someone suggest a company or a group that can produce monodispersed spherical GNPs?

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Serge Grabtchak

You may also take a look at the following sites:

http://www.tedpella.com/gold_html/NanoXact-gold.htm

http://www.nanopartz.com/

Good luck!

If you're in Europe, then it might be more convenient going directly to http://www.bbisolutions.com/

instead of Ted Pella.

Zoraida P Aguilar

They have them at Ocean NanoTech. They come in various sizes and various surface modification.