Characterization of cobalt oxide nanoparticles produced by laser ablation method: Effects of External magnetic field

Effects of external magnetic field in the range of ۰ to ۱۸۰ mT on the characteristics of cobalt oxide nanoparticles (Co۳O۴ NPs) synthesized by pulse laser ablation method in distilled water has been investigated. Ablation was carried out in the presence of permanent magnets with variable strengths. Significant blue shift in excitonic absorption peaks of produced nanoparticles show that with increasing the magnetic field strength during the ablation process, size of nanoparticles was decreased noticeably. This result was confirmed by SEM and TEM images. XRD pattern show that with applying external magnetic field we may have crystalline structure nanoparticles while in the absence of external magnetic field, only amorphous phase of Co nanoparticles was produced. In overall it can be concluded that external magnetic field is a strong tool to control the properties of laser ablation produced ferromagnetic nanoparticles.

کلیدواژه ها:

cobalt oxide nanoparticles ، laser ablation ، plasma plume ، external magnetic field