The zero field self-organization of cobalt/surfactant nanocomposite thin films (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• The zero field self-organization of cobalt/surfactant nanocomposite thin films (Articolo in rivista) (literal)

Anno

• 2009-01-01T00:00:00+01:00 (literal)

Alternative label

• Cataldo S, Pignataro B, Ruggirello A, Bongiorno C, Liveri VT (2009)
  The zero field self-organization of cobalt/surfactant nanocomposite thin films
  in Nanotechnology (Bristol. Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Cataldo S, Pignataro B, Ruggirello A, Bongiorno C, Liveri VT (literal)

Pagina inizio

• 225605 (literal)

Pagina fine

• 225605 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 20 (literal)

Rivista

• Nanotechnology (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• 1. Univ Palermo, Dipartimento Chim Fis F Accascina, I-90128 Palermo, Italy 2. IMM, I-95121 Catania, Italy (literal)

Titolo

• The zero field self-organization of cobalt/surfactant nanocomposite thin films (literal)

Abstract

• Cobalt nanostructures have been prepared by a chemical route based on the Co(II) reduction in the confined space of cobalt bis(2-ethylhexyl) sulfosuccinate (Co(DEHSS)(2)) reverse micelles dispersed in n-heptane. This procedure involves the rapid formation of surfactant softly coated Co nanostructures followed by a slow separation process of the magnetic-field responsive Co/surfactant nanocomposites from the liquid phase. The detailed structure of thin films of the Co/surfactant nanocomposites has been investigated by scanning force microscopy (SFM). The thin films were characterized by different anisotropic features. Micrometric long domains of self-aligned ellipsoidal NPs (tens of nanometers in size) have been observed, together with bendable micrometric long homogeneous nanofibers (NFs). The film structures were strongly dependent on the Co/surfactant ratio and, by increasing the Co percentage, the system was forced towards the formation of mutually connected superstructures consisting of anisotropic bands of self-aligned NFs and anisotropic 2D close packed Co-NP super-lattices. Transmission electron microscopy (TEM) showed that the NPs observed by SFM are in effect composed of almost spherical and oxygen-free cobalt nanoparticles, 1-3 nm in size, which typically assemble in larger ellipsoidal systems tens of nanometers in size. Magnetic force microscopy (MFM) demonstrates the magnetic response of these thin films, highlighting the different behavior (attractive/repulsive) of the Co-NPs aggregates towards the oscillating magnetized tip. The above structural findings have been interpreted in terms of nanostructures/matrix interaction along with a fine balance between short-range isotropic repulsions, van der Waals attractions and long-range anisotropic magnetic interactions. (literal)

Prodotto di

• Sviluppo di metodologie avanzate per dispositivi elettronici micro e nanostrutturati (MD.P05.005.001) (Modulo)
• Institute for microelectronics and microsystems (IMM) (Istituto)

Autore CNR

• CORRADO BONGIORNO (Persona)

Incoming links:

Prodotto

• Institute for microelectronics and microsystems (IMM) (Istituto)
• Sviluppo di metodologie avanzate per dispositivi elettronici micro e nanostrutturati (MD.P05.005.001) (Modulo)

Autore CNR di

• CORRADO BONGIORNO (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Nanotechnology (Rivista)