Hello,

Nanotechnology is a field of research and innovation concerned with building 'things' - generally, materials and devices - on the scale of atoms and molecules. A nanometre is one-billionth of a metre, the ten Times diameter of a hydrogen atom. The diameter of a human hair is, on average, 80,000 nanometres. So you are in be nanotechnology so you can do ME in nanotechnology after qualifying GATE.  You can join chemical engineering or bioengineering after GATE . But Choice is totally yours.

All the best.