Hi Dereik,

Here I am explaining about both the courses

Nanotechnology- It is the study of extremely small things. It is conducted at nanoscale, which is about 1 to 100 nanometers.One millionth of a millimetre or 10-9 m, is a nanometre, and study of matter at that level is nanotechnology.

  The three chief divisions of nanotech are nanomaterials, nanoelectronics and nanobiotechnology. And the concentration of courses would be a function of your specialisation.

Scope of this course is wide in India as well as abroad.

For complete and detailed information about the course, refer to the link below:

https://www.careers360.com/news/3441-Nanotechnology

Electronics and Communication Engineering- This branch of engineering develops everyday devices such as transistors, integrated circuits and printed circuit boards (PCBs)

The discipline deals with electronic devices and software interfaces.

This branch offers wide scope to the engineers mostly in electronics and communication industries.

for detailed information regarding this course, refer to the link below:

https://engineering.careers360.com/electronics-and-communication-engineering-0

Pursue the course which holds your interest. Both the courses are different.

Good Luck!