I have done my undergraduation in electronics and communications engineering. I am planning to do my masters in nanotechnology. Are there good prospects in future for nanotechnology?
I cannot speak for nanotechnology. Your choice of selecting a major should be based on passion rather than prospects. You can excel in any area and create your own mark, all you need is passion to work on it.
Read article [Goal for MS in USA ](http://redbus2us.com/if-ms-in-usa-what-is-your-goal-become-a-professor-scientist-etc/)