Synthesis and characterization of iron cobalt (FECO) nanorods prepared by simple co-precipitation method

We report here a simple synthesis method for iron-cobalt (FeCo) nanoparticles by iron nitrate (FeNO3.9H2O) and cobalt nitrate (CoN2O6.6H2O) as precursor in the presence of ethanol agent and cetyltrimethylammonium bromide (CTAB) surfactant. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS) in different temperature. XRD pattern of FeCo samples showed the structure of body center cubic (bcc) structure. The SEM images show that average particle size of as-prepared sample was around 36 nm and annealed samples were around 28 at 800 oC. These images also showed the particles changed from rod-liked shaped to sphere-liked shaped by increasing annealing temperature from room temperature to 800 oC. The TEM studies show the rod-liked shaped particles. The sharp peaks in FTIR spectrum determined the element of Fe-Co nanoparticles.Keywords: FeCo nanoparticles, sodium borohydrid, CTAB, chemical synthesi

Fabrication and Characterization of Rutile TiO 2 Nanocrystals by Water Soluble Precursor

In this research, TiO 2 nanoparticles were synthesized by a simple wet chemical method. TiCl 4 was used as precursor in hydrogen peroxide and ethanol. The TiO 2 nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), electron dispersive spectroscopy (EDS) and UV-Vis spectrophotometer. The particle size of the as-synthesized TiO 2 was estimated by XRD and TEM analyses in the range of 5-10 nm. The SEM images showed that the size of sphere-like shaped nanoparticles decrease with increasing annealing temperature. The prepared TiO 2 nanoparticles were characterized for phase composition, using X-ray diffractometry. The crystal structure of the nanoparticles after annealing was measured by XRD analysis. It was realized that phase transition from anatase to rutile occurs after heat treatment at 600 °C. The particle size of the annealed sample was also calculated about 20 nm by XRD analysis. The EDS spectrum showed peaks of titanium and oxygen with fewer impurities. The UVVis spectrum showed anatase and rutile phase at wavelength about 375 nm (E g = 3.30 eV) and 470 nm (E g = 2.63 eV) for as-prepared TiO 2 and annealed TiO 2 nanoparticles respectively

Magnetocrystalline properties of Iron-Platinum (L10-FePt) nanoparticles through phase transition

High magneto- crystalline anisotropy (ku=7×106j/m3) of L10-FePt nanoparticles are an excellent candidate for ultra high-density magnetic recording. The 4 nm FePt nanocrystals were prepared by superhydride reduction of FeCl2·4H2O and Pt(acac)2 precursors in the phenyl ether by reduction of the 1, 2-hexadecanediol and LiBEt3H superhydride. The crystal and magnetic structures were studied by XRD and VSM analysis. By TEM and EDS analyses the size distribution and molar concentration of Fe/Pt of the nanoparticles were determined. The results showed that the particles are first superparamagnetic before heat treatment and then a phase transition accrue from disorder fcc to order fct structure after annealing. Finally, the phase transition leads the magnetic anisotropy of hard FePt nanoparticles to increase to 7 kOe

Comparison of the Fe and Pt Nanoparticles with FePt Alloy Prepared by Polyol Process: Shape and Composition Study

In this study, Fe and Pt nanoparticles are first synthesized by decomposition of iron(II) chloride tetrahydrate and reduction of platinum(II) acetylacetonate. Then, FePt nanoparticles are similarly fabricated by adding LiBEt3H to the phenyl ether solution in the presence of oleic acid, oleylamine surfactant at 100°C, followed by refluxing at 255°C. The samples were characterized by transmission electron microscopy and energy dispersive spectroscopy analyses after heat treatments. Transmission electron microscopy images show that self-assembled 8 nm Fe nanoparticles are formed as polygon shape, whereas Pt nanoparticles have broad size distribution. On the other hand, 4.5 nm FePt nanoparticles have standard division about 9%. The results of energy dispersive spectroscopy analysis reveal that the composition of Pt, Fe and FePt nanoparticles gives $Fe_{56}Pt_{44}$ stoichiometry

Solution Combustion Preparation Of Nano-Al2O3: Synthesis and Characterization

The aluminum oxide materials are widely used in ceramics, refractories and abrasives due to their hardness, chemical inertness, high melting point, non-volatility and resistance to oxidation and corrosion. The paper describes work done on synthesis of α-alumina by using the simple, non-expensive solution combustion method using glycine as fuel.Aluminum oxide (Al2O3) nanoparticles were synthesized by aluminum nitrate 9-hydrate as precursor and glycine as fuel. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS). As there are many forms of transition aluminas produced during this process, x-ray diffraction (XRD) technique was used to identify α-alumina. The diameter of sphere-like as-prepared nanoparticles was about 10 nm as estimated by XRD technique and direct HRTEM observation. The surface morphological studies from SEM depicted the size of alumina decreases with increasing annealing temperature. Absorbance peak of UV-Vis spectrum showed the small bandgap energy of 2.65 ev and the bandgap energy increased with increasing annealing temperature because of reducing the size