In college, probably not. Nanotechnology is more materials science or mechanical engineering, and professors are usually expected to have a Ph.D. in the field they are teaching, so you wouldn't qualify to be a physics professor.
In community college, possibly, although I don't really know much about teaching here.
In high school, also possibly, although most states have additional teaching credentials that need to be obtained. I'm familiar with CA, where the normal path is a 1 year credentialing program that includes student teaching. "Emergency" credentials are also possible, where a district that wants to hire you can apply for special permission to hire you without a credential. (NCLB makes this a little less likely though, because it makes the teacher statistics for the school look worse.)
Good luck!