Air‐Stable Carbon‐Fe Based Magnetic Nanostructures

Abstract

Herein, we report a simple solid state synthetic route to prepare carbon‐Fe based magnetic nanoparticles with different compositions and morphologies through annealing of amorphous Fe nanoparticles under appropriate conditions. Tri‐n‐octylphosphine (TOP) capped amorphous Fe nanoparticles with a mean diameter of 3.2 nm were synthesized using solvated metal atom dispersion (SMAD) method. Annealing of as‐prepared Fe nanoparticles at 300 °C produced carbon encapsulated crystalline bcc‐Fe nanoparticles, whereas at higher temperatures i.e., 400 °C and 500 °C, spherical Fe3C/C core‐shell nanoparticles were obtained. Annealing of as‐prepared Fe nanoparticles in the presence of tri‐n‐octylphosphine oxide (TOPO) ligand under optimized conditions yielded rod shaped Fe3C/C core‐shell morphology. The size, composition and particle morphology of these magnetic nanoparticles could be controlled by changing the reaction time, temperature and the concentration of the TOPO ligand. Magnetic measurements show that rod shaped Fe3C nanoparticles exhibit enhanced coercivity (Hc) values compared with spherical Fe3C nanoparticles, which is due to shape anisotropy.

Bimetallic Gold–Iron Oxide Nanoparticles as Carriers of Methotrexate: Perspective Tools for Biomedical Applications

“…Bimetallic nanosystems containing iron are among the most studied objects whose properties can be regulated by a modification with other metals [9]. Heterometallic nanoparticles containing gold and iron demonstrate improved optical and magnetic properties [10] and hence improve their efficient application in many fields [11], including medicine [5,12]. The introduction of gold into iron oxide nanoparticles does not reduce the magnetic characteristics of the system and allows the use of external magnetic influence to control the AuFe system as a whole [5,13].…”

Catalyst characterization Ni-Sn nanoparticles supported in Al2O3and MgO: Acetophenone hydrogenation

“…This method allows the production of very small zero-value bi-metallic particles. 16 It implies the simultaneous evaporation of the method and its co-condensation with a chosen solvent vapor (ketones, alcohols, or ether) at 77 K and has been successfully used in the preparation of nanomaterials and nanoparticles with bactericidal 17 and magnetic 18 properties. This method has also been used to obtain highly monodisperse nanoparticles.…”