Do you think Chemistry is a good major for engineering school?

Hi, I am an university freshman in Canada majoring in Chemistry. At first, I chose chemistry because I want to go to med school but since I went to a nanotechnology conference, I have been wanting to be a nanoengineer instead. Now my question comes in: do you think Chemistry is a good major for engineering school? The graduate engineering programs I am interested in are Electrical Engineering, Mechanical Engineering, Biomedical Engineering, Materials Engineering, Robotics Engineering and Nanoengineering (no, I am not interested in Chemical Engineering) and my passion is to build nanoscale robots using biochemical materials (synthesized using the body's own micro and macro-molecules) that can precisely deliver drugs and do internal surgery on cancerous tissue. Or do I have to transfer to physics since transferring to undergraduate engineering programs is almost impossible for me. Thank you for spending time reading this.