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Titolo:
Growth and morphology of cobalt nanoparticles on alumina
Autore:
Dureuil, V; Ricolleau, C; Gandais, M; Grigis, C; Lacharme, JP; Naudon, A;
Indirizzi:
Univ Paris 06, Lab Mineral Cristallog Paris, CNRS UMR 7590, F-75252 Paris 05, France Univ Paris 06 Paris France 05 s, CNRS UMR 7590, F-75252 Paris 05, France Univ Paris 07, Lab Mineral Cristallog Paris, CNRS UMR 7590, F-75252 Paris,France Univ Paris 07 Paris France F-75252 , CNRS UMR 7590, F-75252 Paris,France Univ Poitiers, UMR 6630, CNRS, Met Phys Lab,UFR Sci, F-86962 Futuroscope Chasseneuil, France Univ Poitiers Futuroscope Chasseneuil France F-86962 Chasseneuil, France
Titolo Testata:
JOURNAL OF CRYSTAL GROWTH
fascicolo: 4, volume: 233, anno: 2001,
pagine: 737 - 748
SICI:
0022-0248(200112)233:4<737:GAMOCN>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-PROPERTIES; CLUSTERS; DEPOSITION; PARTICLES;
Keywords:
crystal morphology; physical vapor deposition processes; metals; nanomaterials;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Ricolleau, C Univ Paris 06, Lab Mineral Cristallog Paris, CNRS UMR 7590, Case 115,4 Pl Jussieu, F-75252 Paris 05, France Univ Paris 06 Case 115,4 Pl Jussieu Paris France 05 , France
Citazione:
V. Dureuil et al., "Growth and morphology of cobalt nanoparticles on alumina", J CRYST GR, 233(4), 2001, pp. 737-748

Abstract

Cobalt films of different average thickness (t(Co) = 0.15-4.8 nm) have been deposited on amorphous alumina (a-Al2O3) at different temperatures (T-s =130-600 degreesC), with the aim of forming Co nanoparticles of well-defined size and shape. Two deposition techniques have been used: thermal evaporation (TE) of a Co filament at the pressure P = 10(-10) mbar and pulsed laser deposition (PLD) from a Co target at P = 2 x 10(-6) mbar. The structural properties of the Co films have been investigated by using transmission electron microscopy (TEM), electron diffraction (TED) and high resolution (HREM). Co nanoparticles are found at high temperature, T-s = 350 degreesC and above, in the films prepared by both techniques. In the early stages of growth, they are nearly spherical and at further stages they become oblate andthe height/base-diameter (h/phi) ratio decreases when the diameter increases. The differences between the films prepared by the two techniques appearprincipally at low deposition temperature, T-s = 270 degreesC and below: worm-like shape of pure Co are found in the films grown in the TE chamber and quasicontinuous layer films containing Co and Co oxide are found in the films grown in the PLD chamber. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:39:40