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 degrees C. The iron content in the sample (0.54 +/- 0.05 mu g/cm(2)) 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 T-max similar to 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.
Magnetite nanoparticles anchored to crystalline silicon surfaces / Cattaruzza, F; Fiorani, D; Flamini, A; Imperatori, P; Scavia, G; Suber, L; Testa, Am; Mezzi, A; Ausanio, Giovanni; Plunkett, Wr. - In: CHEMISTRY OF MATERIALS. - ISSN 0897-4756. - STAMPA. - 17:(2005), pp. 331-336. [10.1021/cm050231a]
Magnetite nanoparticles anchored to crystalline silicon surfaces
AUSANIO, GIOVANNI;
2005
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 degrees C. The iron content in the sample (0.54 +/- 0.05 mu g/cm(2)) 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 T-max similar to 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.File | Dimensione | Formato | |
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