Sure, you are just starting out. Maybe you will change your mind 5 times about what interests you most and what kind of career you want. If you are interested in nanotechnology and they offer a nanotechnology B.TECH, what is the problem? Just do that programme.
If you were looking to pick the best option out of 20 universities, then that's a different issue. But there is one university and one nanotechnology programme.
You can always ask your teachers to help you explain more about a certain field, if they are involved in it. And if you get access to journals through universities, you can read what is going on right now in nanotechnology and read reviews about the state of the field.
If you want more options, you cannot limit yourself to one university. And it seems your university is an engineering school. That's not a problem, but a flavor of it is different compared to a fundamental science school.
There's a dozen different kinds of nanotechnology and a dozen different methods to study them, and the field will change while you are doing your degree. You just want to make sure you get some strong foundations in fundamental chemistry and the relevant physics, plus lab experience with some important techniques. Ideally in your bachelor, but if you can't you can still pick it up in your master.
A B.Tech in EE or ChemE will not prepare you adequately for research in the field of nanotechnology. You didn't say you want to do an MSc, but it sounds like you do. Try to make sure that your bachelor gives you access to the MSc you are eyeing.