What do you mean by correct? In comparison with experimental results? MWCNTs possess different electrical properties that that of SWCNTs. They normally have lower electrical conductivity as well as their wall interactions can offer various conductivity patterns.

Thanks for your reply Mortega G,actually when i am increasing the diameter beyond 1nm ,since i have read also that SWNT works up to diameter=1nm,beyond that it does not work,and yes as you are asking me that when i am increasing the diameter ,results are not coming like a MOSFET curves used to come ,like in cutt off region etc,so if you can tell me how to proceed for MWNT,from here it would be helpful to me .

warmest regards

Well, I am not very deep at modeling of nanomaterials. You would find some recent papers if you take a look at recent publications. Good luck!

Thanks a lot.