Keen doesn't exist yet... But no.
To start with, Keen weapons (that receive a bonus) have historically been magic items. They aren't just sharp, they're magically sharp. And magic items are explicitly excluded by the spell:
Creatures or magic items can't be created or transmuted by this spell.
Even if your DM was generous, and ruled that a monomolecular blade would count as Keen without being magical, the spell will still likely fail as worded for another reason:
The quality of objects made by the spell is commensurate with the quality of the raw materials.
I'm pretty sure that steel doesn't take or keep a monomolecular edge for any meaningful length of time. You'd need to find something that does, which is likely to be difficult to acquire in a pseudo-medieval setting.
All that being said... Be sure to ask your DM. The rules say "no," but your DM is free to override them if he thinks the results will be interesting.