After looking at this: **broken link removed**
It seems it would be relatively easy to make a field emission cathode as a hobby.
And it seems that cheap, relatively pure nanotubes (although they are multi-wall rather than single-wall and thus have a larger diameter) can be found on ebay: **broken link removed**
Rather than use epoxy and possibly have problems with vapor pressure, I wonder if nanotubes can be attached to a substrate by a composite plating process similar to that used to attach diamond powder to a tool bit?
Anyone ever fool around and try to bond nanotubes to something?
Regards,
Joe