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Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2 (CROSBI ID 197674)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Lončarek, Ivana ; Tonejc, Anđelka ; Skoko, Željko ; Novosel, Nikolina ; Mustapić, Mislav ; Zadro, Krešo Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2 // Croatica chemica acta, 86 (2013), 3; 297-307

Podaci o odgovornosti

Lončarek, Ivana ; Tonejc, Anđelka ; Skoko, Željko ; Novosel, Nikolina ; Mustapić, Mislav ; Zadro, Krešo

engleski

Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2

Magnetic nanoparticles have attracted much interest recently due to their novel properties and versatile applications (e.g. in biomedicine1- 3, microelectromechanical / nanoelectromechanical (MEMS/NEMS) devices4, giant magnetoresistance (GMR) sensors5 etc.). The point essential for the study of fine particles is the production of samples of narrow and reproducible size distribution. A well known method for preparation of alloys in the form of fine particles (particularly ternary transition metal-boron alloys) is the chemical reduction of aqueous solution of metal salts, with alkali metal borohydride as the reducing agent6-8. It has been shown that the amount of boron strongly affects the magnetic behaviour of such alloys (as it alters the band structure and Fermi density of states)9. Alloys chemically reduced by alkali metal borohydride have nanosized morphology and consequently higher surface area and activity than those prepared by some physical methods (for example, rapid melt quenching method by which alloys are produced in form of thin ribbons10-12) and can be amorphous13-15 or amorphous/crystalline16, 17. By systematically adjusting various parameters – time, temperature, concentration and chemistry of starting materials, surfactants and solvents – it is possible to control the morphology (i.e. size and shape) and therefore the properties of nanoparticles. The aim of this investigation was to obtain nanosized particles with well defined dimensions (10-30 nm) and relatively narrow size distribution using chemical reduction synthesis. Silica shell was used in order to stabilize the nanoparticles (e.g. to reduce oxidation of the core, to control the distance between the particles thus reducing their magnetic interaction, previously reported on example of Co-Ni based nanoparticles18). The resulting microstructures were examined by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS).

amorphous NiCoB nanoparticles; X-ray diffraction; rietveld refinement; scanning electron microscopy (SEM); energy dispersive X-ray analysis (EDS

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Podaci o izdanju

86 (3)

2013.

297-307

objavljeno

0011-1643

Povezanost rada

Fizika

Poveznice
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