Research Article

Catalytic Synthesis of Substrate-Free, Aligned and Tailored High Aspect Ratio Multiwall Carbon Nanotubes in an Ultrasonic Atomization Head CVD Reactor

Figure 14

High aspect ratio MWCNTs synthesized at (a) SEM image at H2 and Ar flow rates 3 and 1 L/min, temperature 800°C, and feed reaction time 30 min, (b) SEM image at H2 and Ar flow rates 3 and 1 L/min, temperature 850°C, and feed reaction time 30 min, and (c) pure H2 flow rate 4 L/min with no carrier gas, temperature 850°C, and reaction time 30 min.