Papers by Keyword: Iron Carbonyl

Abstract: CoPt nanoparticles with an average size of 2.8 – 4.7 nm were synthesized by reduction of non-toxic precursors Co(CH₃COO)₂ and Pt(acac)₂ using trioctylamine as a solvent at reaction temperature of 260 – 280 °C. The X-ray diffraction pattern showed that as-prepared particles have a disordered face-centered cubic structure while annealing at 700 °C caused them to be an ordered face-centered tetragonal structure. The annealing increased magnetic coercivity of the particles from zero to 772.4 Oe and their saturated magnetization from 15.04 to 27.95 emu/g.

Abstract: Monodisperse iron nanoparticles were prepared by thermal decomposition of iron carbonyl at low temperature of 160 oC - 180 oC in kerosene. The synthesized iron nanoparticles were spherical and their average size was decreased from 11.2nm to 8.6 nm as increasing the reaction temperature from 160 oC to 180 oC, respectively. The synthesized iron nanoparticles are amorphous, but the surface of the particles is easily oxidized and to be spinel structured iron oxide by HRTEM.

Abstract: Electron beam induced deposition (EBID) was carried out with gas introduction systems attached to field emission scanning electron microscope (FE-SEM). Using iron carbonyl and ferrocene, three dimensional (3-D) antenna structures were fabricated in the range of 30-50 nm in diameter and 500-1000 nm in size. Post-deposition annealing of iron nanostructures resulted in the formation of crystalline alpha-iron and iron carbide phases. The iron concentration was controlled by the partial pressure of iron carbonyl and ferrocene. Electron holography observation with field emission transmission electron microscopy (FE-TEM) revealed that the remanent magnetic flux density Br of the nanostructures also depends on the iron concentration.