Abstract
Very small nanometric oxide particles (CoO and Co3C4, around 2 nm in diameter) well dispersed inside a polymer matrix were prepared by solid-state oxidation of a metallic colloid precursor (1.6 nm Co particles). WAXS (wide-angle X-ray scattering) and HREM (high-resolution electronic microscopy) were used to observe very precisely the structural changes occurring during the oxidation process. With cobalt particles a few nanometers large, air oxidation at room temperature results in a surface passivation. Consequently the particles show a composite structure with a metallic core surrounded by an oxide surface layer. Preliminary magnetic measurements reveal that unidirectional exchange anisotropy between the metallic ferromagnetic core and the antiferromagnetic oxide layer occurs below 130 K.
| Original language | English |
|---|---|
| Pages (from-to) | 2702-2708 |
| Number of pages | 7 |
| Journal | Chemistry of Materials |
| Volume | 11 |
| Issue number | 10 |
| Publication status | Published - 1999 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Chemistry
- Materials Science(all)
Cite this
Synthesis and characterization of CoO, Co3O4, and mixed Co/CoO nanoparticules. / Verelst, Marc; Ely, Teyeb Ould; Amiens, Catherine; Snoeck, Etienne; Lecante, Pierre; Mosset, Alain; Respaud, Marc; Broto, Jean Marc; Chaudret, Bruno.
In: Chemistry of Materials, Vol. 11, No. 10, 1999, p. 2702-2708.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and characterization of CoO, Co3O4, and mixed Co/CoO nanoparticules
AU - Verelst, Marc
AU - Ely, Teyeb Ould
AU - Amiens, Catherine
AU - Snoeck, Etienne
AU - Lecante, Pierre
AU - Mosset, Alain
AU - Respaud, Marc
AU - Broto, Jean Marc
AU - Chaudret, Bruno
PY - 1999
Y1 - 1999
N2 - Very small nanometric oxide particles (CoO and Co3C4, around 2 nm in diameter) well dispersed inside a polymer matrix were prepared by solid-state oxidation of a metallic colloid precursor (1.6 nm Co particles). WAXS (wide-angle X-ray scattering) and HREM (high-resolution electronic microscopy) were used to observe very precisely the structural changes occurring during the oxidation process. With cobalt particles a few nanometers large, air oxidation at room temperature results in a surface passivation. Consequently the particles show a composite structure with a metallic core surrounded by an oxide surface layer. Preliminary magnetic measurements reveal that unidirectional exchange anisotropy between the metallic ferromagnetic core and the antiferromagnetic oxide layer occurs below 130 K.
AB - Very small nanometric oxide particles (CoO and Co3C4, around 2 nm in diameter) well dispersed inside a polymer matrix were prepared by solid-state oxidation of a metallic colloid precursor (1.6 nm Co particles). WAXS (wide-angle X-ray scattering) and HREM (high-resolution electronic microscopy) were used to observe very precisely the structural changes occurring during the oxidation process. With cobalt particles a few nanometers large, air oxidation at room temperature results in a surface passivation. Consequently the particles show a composite structure with a metallic core surrounded by an oxide surface layer. Preliminary magnetic measurements reveal that unidirectional exchange anisotropy between the metallic ferromagnetic core and the antiferromagnetic oxide layer occurs below 130 K.
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UR - http://www.scopus.com/inward/citedby.url?scp=0000126358&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0000126358
VL - 11
SP - 2702
EP - 2708
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 10
ER -