Cobalt-containing core-shell nanoparticles on the surface of poly(tetrafluoroethylene) microgranules

Summary, in English

Cobalt-containing nanoparticles have been prepared via thermal decomposition of cobalt acetate on the surface of poly(tetrafluoroethylene) (PTFE) microgranules forming a fluidized bed over the surface of hot mineral oil. Using transmission electron microscopy, the average size of the cobalt-containing nanoparticles has been determined to be 3.6 nm. The composition and structure of the nanoparticles have been determined by x-ray diffraction, extended x-ray absorption fine structure spectroscopy, and electron paramagnetic resonance, and the magnetic properties of the synthesized nanomaterial have been studied. The results indicate that the nanoparticles have a core-shell structure, with a metallic cobalt core (≲ 10 vol%) and a shell consisting of three phases: Co ₃O ₄ (≲ 80%) and small amounts of CoO and CoF ₂ (≲ 10%). The fluoride phase results from the interaction of the nanoparticles with surface fluorine atoms of the PTFE microgranules.

• Author: G. Yu Yurkov; D. A. Baranov; A. V. Kozinkin; Yu A. Koksharov; T. I. Nedoseikina; O. V. Shvachko; S. A. Moksin; S. P. Gubin
• Publishing year: 2006-09
• Language: English
• Pages: 1012-1019
• Publication/Series: Inorganic Materials
• Volume: 42
• Issue: 9
• Links: http://dx.doi.org/10.1134/S0020168506090159
• Document type: Journal article
• Publisher: Pleiades Publishing
• Status: Published
• ISBN/ISSN/Other: ISSN: 0020-1685