Nano explosives are the rage, but the problem is that there is a very real limit to the size of an explosive before it becomes non-functional (critical mass). A shockwave must propagate through a certain amount of material (i.e., there is a 'run time') for it to fully form, and without this, it doesn't go bang. Now, on the nanoscale, this won't fly, so they have to go for materials that do detonate on the nanoscale, and you are unfortunately left with primary HEs. Those are dangerous monsters, and some are even point detonants. One material I saw was a true point detonant; 8 mcg completely destroyed a DSC pan and analyzer (or whatever that name of the thing the pan sits in). Had to buy a new part for the instrument. Suck.
Point being (heh, no pun intended), if he was doing nano explosives, he may have been working with VERY sensitive and powerful material. Not a good combination.