Magnetic Characterization of web-like Carbon Nanotubes Catalyzed by Fe2O3 Via Pulsed Laser Ablation Deposition (PLAD) Technique

Web-like carbon nanotubes were synthesized via Laser Ablation Deposition (PLAD) in a T-shape stainless steel chamber. Nd-YAG laser with 532nm wavelength was used to irradiate the target of graphite and catalyst, with 5-7 ns pulsed width. Fe2O3 was used as catalyst to form the graphite target. The vacuum level was kept at 5 mtorr with argon gas flowing from bottom of the chamber. The plume that was deposited on a glass substrate and was then characterized using Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX) analysis, Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). Web-like CNTs structures were deposited on the glass substrate. These web-like structures randomly aligned with the size of 99nm to 234nm. TEM images have confirmed these web-like structures are CNTs. VSM results show that the encapsulation of the Fe2O3 catalyst has influenced the magnetic properties of the CNTs. The magnetic property of CNTs was increased with the increasing amount of the Fe2O3 catalyst filled the tube of CNTs.