Figure 2
TEM pictures of 31.5 at.% sulfur grown CNFs (a) CNF with a wide and variable diameter (b) bamboo-shaped and sharp tip CNF (c) CNF with transverse bridge compartment (d) CNF with hemispherical cap (e) a 25 nm CNF with metal particle at the tip and hollow channel of CNF (f) two kinds of graphene arrangement in CNFs (g) a 47 nm CNF with metal particle inside the hollow core (h) a short fiber grown over a fiber (i) open ended CNF with diameter of 75 nm (j) CNF with amorphous carbon coating (k) general overview of 21 at.% sulfur grown CNF (l) wide CNF, grown using 21 at.% of sulfur