Futurama does an episode on nano-technology.

Futurama, Season 6, Episode 15: Benderama

Naturally, this episode’s goal is entertainment, not so much the accurate portrayal of the technology.

Quoting from wikipedia article:

The premise of “Benderama” is based around the transhumanist theory of grey goo, an end-of-the-world scenario in which out-of-control self-replicating robots consume all matter on Earth while building more of themselves.

The episode is not officially available for viewing online (but you can still find it, of course).