I have been interested in Nanotechnology myself. Here's a link that might interest you:
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They have an inventory of nanotech-based consumer products that are currently in the market. You can do a search by category or by brand name. When you get the product or the brand/company that produces it, then you can start looking for suppliers. Note that this is not a supplier site and that they are not an advocate for or against certain nanotechnologies.
Hope that helps! Cheers! :)