Synthesis of Single-Walled Carbon Nanotubes: Effects of Active Metals, Catalyst Supports, and Metal Loading Percentage

Figure 4

SEM images showing nanotube structure synthesised using the (a) Fe₃O₄/SiO₂, (b) Fe₃O₄/Al₂O₃, and (c) Fe₃O₄/MgO catalysts.

(a)

(b)

(c)