A Nanobomb

Scientists turned to nanotechnology, combining tiny particles of metals such as nanoaluminum with iron oxide to make superthermite. That stuff speeds up the chemical reaction that causes explosions by 1000 times. The result? A gigantic boom from these energy-packed nanometals, much more powerful than anything short of a nuclear weapon.

Source: http://www.technologyreview.com/read_article.aspx?id=14105&ch=nanotech&a=f