Serveur d'exploration sur le cobalt au Maghreb

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Nucleation, growth and properties of Co nanostructures electrodeposited on n-Si(111)

Identifieur interne : 000242 ( PascalFrancis/Curation ); précédent : 000241; suivant : 000243

Nucleation, growth and properties of Co nanostructures electrodeposited on n-Si(111)

Auteurs : MOHAMED REDHA KHELLADI [Algérie] ; Loubna Mentar [Algérie] ; Amor Azizi [Algérie] ; Figen Kadirgan [Turquie] ; Guy Schmerber [France] ; Aziz Dinia [France]

Source :

RBID : Pascal:12-0316125

Descripteurs français

English descriptors

Abstract

In the present work, cobalt thin films deposited directly on n-Si(111) surfaces by electrodeposition in Watts bath have been investigated. The electrochemical deposition and properties of deposits were studied using cyclic voltammetry (CV), chronoamperometry (CA), ex situ atomic force microscopy (AFM), X-ray diffraction (XRD) and alternating gradient field magnetometer (AGFM) techniques. The nucleation and growth kinetics at the initial stages of Co studied by current transients indicate a 3D island growth (Volmer-Weber); it is characterized by an instantaneous nucleation mechanism followed by diffusion limited growth. According to this model, the estimated nucleus density and diffusion coefficient are on the order of magnitude of 106 cm-2 and 10-5 cm2 s-1, respectively. AFM characterization of the deposits shows a granular structure of the electrodeposited layers. XRD measurements indicate a small grain size with the presence of a mixture of hcp and fcc Co structures. The hysteresis loops with a magnetic field in the parallel and perpendicular direction and showed that the easy magnetization axis of Co thin film is in the film plane. .
pA  
A01 01  1    @0 0169-4332
A03   1    @0 Appl. surf. sci.
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A06       @2 8
A08 01  1  ENG  @1 Nucleation, growth and properties of Co nanostructures electrodeposited on n-Si(111)
A11 01  1    @1 MOHAMED REDHA KHELLADI
A11 02  1    @1 MENTAR (Loubna)
A11 03  1    @1 AZIZI (Amor)
A11 04  1    @1 KADIRGAN (Figen)
A11 05  1    @1 SCHMERBER (Guy)
A11 06  1    @1 DINIA (Aziz)
A14 01      @1 Laboratoire de Chimie, Ingénierie Moléculaire et Nanostructures, Université F @2 Abbas-Sétif, 19000 @3 DZA @Z 1 aut. @Z 2 aut. @Z 3 aut.
A14 02      @1 Departments of Chemistry, Istanbul Technical University @2 Maslak 34469, Istanbul @3 TUR @Z 4 aut.
A14 03      @1 Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS - Université de Strasbourg, 23 rue du Loess, BP 43 @2 67034 Strasbourg @3 FRA @Z 5 aut. @Z 6 aut.
A20       @1 3907-3912
A21       @1 2012
A23 01      @0 ENG
A43 01      @1 INIST @2 16002 @5 354000506983730900
A44       @0 0000 @1 © 2012 INIST-CNRS. All rights reserved.
A45       @0 36 ref.
A47 01  1    @0 12-0316125
A60       @1 P
A61       @0 A
A64 01  1    @0 Applied surface science
A66 01      @0 NLD
C01 01    ENG  @0 In the present work, cobalt thin films deposited directly on n-Si(111) surfaces by electrodeposition in Watts bath have been investigated. The electrochemical deposition and properties of deposits were studied using cyclic voltammetry (CV), chronoamperometry (CA), ex situ atomic force microscopy (AFM), X-ray diffraction (XRD) and alternating gradient field magnetometer (AGFM) techniques. The nucleation and growth kinetics at the initial stages of Co studied by current transients indicate a 3D island growth (Volmer-Weber); it is characterized by an instantaneous nucleation mechanism followed by diffusion limited growth. According to this model, the estimated nucleus density and diffusion coefficient are on the order of magnitude of 106 cm-2 and 10-5 cm2 s-1, respectively. AFM characterization of the deposits shows a granular structure of the electrodeposited layers. XRD measurements indicate a small grain size with the presence of a mixture of hcp and fcc Co structures. The hysteresis loops with a magnetic field in the parallel and perpendicular direction and showed that the easy magnetization axis of Co thin film is in the film plane. .
C02 01  3    @0 001B60
C02 02  3    @0 001B70
C02 03  3    @0 001B80
C03 01  3  FRE  @0 Nucléation @5 01
C03 01  3  ENG  @0 Nucleation @5 01
C03 02  3  FRE  @0 Nanostructure @5 02
C03 02  3  ENG  @0 Nanostructures @5 02
C03 03  3  FRE  @0 Silicium @2 NC @5 03
C03 03  3  ENG  @0 Silicon @2 NC @5 03
C03 04  3  FRE  @0 Croissance film @5 04
C03 04  3  ENG  @0 Film growth @5 04
C03 05  3  FRE  @0 Dépôt électrolytique @5 05
C03 05  3  ENG  @0 Electrodeposition @5 05
C03 06  3  FRE  @0 Cobalt @2 NC @5 06
C03 06  3  ENG  @0 Cobalt @2 NC @5 06
C03 07  3  FRE  @0 Métal transition @5 07
C03 07  3  ENG  @0 Transition elements @5 07
C03 08  3  FRE  @0 Si @4 INC @5 32
C03 09  3  FRE  @0 Co @4 INC @5 33
N21       @1 240
N44 01      @1 OTO
N82       @1 OTO

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<div type="abstract" xml:lang="en">In the present work, cobalt thin films deposited directly on n-Si(111) surfaces by electrodeposition in Watts bath have been investigated. The electrochemical deposition and properties of deposits were studied using cyclic voltammetry (CV), chronoamperometry (CA), ex situ atomic force microscopy (AFM), X-ray diffraction (XRD) and alternating gradient field magnetometer (AGFM) techniques. The nucleation and growth kinetics at the initial stages of Co studied by current transients indicate a 3D island growth (Volmer-Weber); it is characterized by an instantaneous nucleation mechanism followed by diffusion limited growth. According to this model, the estimated nucleus density and diffusion coefficient are on the order of magnitude of 106
<sup> </sup>
cm
<sup>-2</sup>
and 10
<sup>-5</sup>
cm
<sup>2</sup>
s
<sup>-1</sup>
, respectively. AFM characterization of the deposits shows a granular structure of the electrodeposited layers. XRD measurements indicate a small grain size with the presence of a mixture of hcp and fcc Co structures. The hysteresis loops with a magnetic field in the parallel and perpendicular direction and showed that the easy magnetization axis of Co thin film is in the film plane. .</div>
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<s0>In the present work, cobalt thin films deposited directly on n-Si(111) surfaces by electrodeposition in Watts bath have been investigated. The electrochemical deposition and properties of deposits were studied using cyclic voltammetry (CV), chronoamperometry (CA), ex situ atomic force microscopy (AFM), X-ray diffraction (XRD) and alternating gradient field magnetometer (AGFM) techniques. The nucleation and growth kinetics at the initial stages of Co studied by current transients indicate a 3D island growth (Volmer-Weber); it is characterized by an instantaneous nucleation mechanism followed by diffusion limited growth. According to this model, the estimated nucleus density and diffusion coefficient are on the order of magnitude of 106
<sup> </sup>
cm
<sup>-2</sup>
and 10
<sup>-5</sup>
cm
<sup>2</sup>
s
<sup>-1</sup>
, respectively. AFM characterization of the deposits shows a granular structure of the electrodeposited layers. XRD measurements indicate a small grain size with the presence of a mixture of hcp and fcc Co structures. The hysteresis loops with a magnetic field in the parallel and perpendicular direction and showed that the easy magnetization axis of Co thin film is in the film plane. .</s0>
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}}

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