@ parmnparsley- you definitely have options as to where you may be able to find a job if you complete your program. A great site you may want to look at is understanding nano. It is a directory that lists different nanotech companies by industry. I happened to stumble across this site, and I found out there are many companies that specialize in nanotechnology.
I am looking to get into the renewable energy field, and nanotechnology is beginning to take center stage in the development of new solar cell technologies. Companies like Konarka and nanosolar are using nano particles and nano semi-conductor ink to make light weight, inexpensive, and flexible solar panels that can be put almost anywhere. They were also featured in that same National Geographic Magazine that inspired your interest in nanotechnology.
As for your interests, companies like Oxonica and H2Oil are designing nano-fuels that improve efficiency and reduce emissions, both very relevant to the aerospace industry. Good luck in your decision.