Fig. 2

Reproduced with permission from [33]. Copyright 2017, Springer Nature
a Single- and double-walled BNNT synthesized by arc discharge method. b IR image of the cathode and anode electrodes in the chamber.
Reproduced with permission from [33]. Copyright 2017, Springer Nature
a Single- and double-walled BNNT synthesized by arc discharge method. b IR image of the cathode and anode electrodes in the chamber.