P.G Nanotechnology in India

Hello comrades,
Am currently doing B.E Aeronautical in India. I have recently found the immense scope of nanotechnology fascinating and how its shaping the future domains of engineering. Am very much interested in doing my post graduate work in this field. What is the eligibility, the entrance exams required to join the course, the top institutions specializing in this field and your humble suggestions regarding the same.
Thank you!