Thorough interdisciplinary studies may or may not lead to nanotechnology, but they're fairly certain to lead to something new. While there are a fair number of (say) marine biologists out there, and a fair number of astronomers, there are probably rather few people who have expertise in both fields; and it's possible that there exists some obscure unsolved problem in marine biology whose solution is obvious to someone who's keeping up on the forefront of astronomy research. Or vice versa.

Or substitute in any other two fields of your choice.