The detailed study conducted above shed light onto numerous issues faced
by present technologies that are used to manufacture CNTs. The findings
can be listed as:-
Fabrication of CNTs of the given diameter is still not possible due to
catalyst particle size limitations.
Controlling the number of walls of MWCNTs is another issue. It still
remains a huge task to synthesis thick MWCNTs with more than six
carbon cylinders.
Chirality control remains one of the most sought after areas of
research.
Recycling of waste materials is another efficient, cost-effective, and
green alternative for large-scale production of CNTs.
The most widely used cost effective method for mass production of CNTs
is the CVD method despite the imperfect CNTs it produces.