http://www.cnr.it/ontology/cnr/individuo/prodotto/ID52063
Magnetite Nanoparticles Anchored to Crystalline Silicon Surfaces (Articolo in rivista)
- Type
- Label
- Magnetite Nanoparticles Anchored to Crystalline Silicon Surfaces (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/cm050231a (literal)
- Alternative label
Cattaruzza F.; Fiorani D.; Flamini A.; Imperatori P.; Scavia G.; Suber L.; Testa A.M.; Mezzi A.; Ausanio G.; Plunkett R.W. (2005)
Magnetite Nanoparticles Anchored to Crystalline Silicon Surfaces
in Chemistry of materials; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- Cattaruzza F.; Fiorani D.; Flamini A.; Imperatori P.; Scavia G.; Suber L.; Testa A.M.; Mezzi A.; Ausanio G.; Plunkett R.W. (literal)
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- Titolo
- Magnetite Nanoparticles Anchored to Crystalline Silicon Surfaces (literal)
- Abstract
- Magnetite nanoparticles of 5 nm mean diameter, coated with 10-undecynoic acid, have been anchored to crystalline Si(100) surfaces via the hydrosilylation reaction at 180 °C. The iron content in the sample (0.54 ± 0.05 ¼g/cm2) has been determined by atomic absorption analysis. The sample has been further characterized by X-ray photoelectron spectroscopy, field emission scanning, scanning-tunneling, and atomic force (AFM) microscopies. The thermal anchoring does not alter the morphology of the nanoparticles, causing only a slight oxidation of their surfaces. However, a second layer of nanoparticles was also formed, covering about 50% of the surface. The magnetic properties were studied using a SQUID magnetometer. ZFC (zero-field cooled) and FC (field cooled) curves were obtained in the 5-300 K temperature range. The ZFC curve shows a rounded maximum at Tmax ~20 K. A hysteretic magnetization cycle was also observed at 5 K with associated magnetization saturation and coercitivity values of 40 emu/g and 160 Oe, respectively. The magnetic behavior of the sample was found to be typical of an assembly of noninteracting (or very weakly interacting) super-paramagnetic particles. (literal)
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