Fine structure and possible growth mechanisms of some electrodeposited CuCo granular films

Tochitskii, T. A.; Jones, G. A.; Blythe, H. J.; Fedosyuk, V. M.; Castro, José Adilson de

doi:10.1016/s0304-8853(01)00038-5

Cited by 17 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Figure 7a, the furcation of ZFC/FC curves emerged at nearly 300 K, and there is no magnetization maximum in the ZFC curve across the measured temperature range, implying that the superparamagnetic blocking temperature should be higher than 300 K, that is, the Co 34 Cu 66 NTs are ferromagnetic at 300 K. Moreover, it was observed that the magnetization has a sharp increase at the lowtemperature range of 5 to ∼25 K, and this is a different feature as compared to the continuous Co-Cu alloy films reported before. 35,36 One possible explanation is that we are observing the high-temperature flank of a peak with a maximum magnetization well below 5 K. It can arise due to the extremely small magnetic particles produced during the electrodeposition. This should be reasonable since we have preliminarily confirmed the presence of very small hcp Co nanoclusters according to the XRD and ED results mentioned previously.…”

Section: ) Kλ β Cos θmentioning

confidence: 94%

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

et al. 2008

View full text Add to dashboard Cite

A highly efficient direct electrodeposition method was used to prepare Co-Cu alloy nanotubes in an anodic alumina template without modification. The morphology and structure of as-prepared Co-Cu nanotubes were examined by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The formation mechanism of the tubular nanostructure is discussed. It was found that the template directed electrodeposition of Co-Cu at a large current density can result in the highly efficient growth of nanotubes and that the growth rate as well as the wall thickness of the nanotubes can be controlled via the current density of electrodeposition. Magnetic measurements of the Co-Cu nanotube array show that the nanotubes are ferromagnetic at room temperature and may find potential applications in the fields of biological separation and drug delivery.

show abstract

Section: ) Kλ β Cos θmentioning

confidence: 94%

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

et al. 2008

View full text Add to dashboard Cite

show abstract

“…[5][6][7] The process has several advantages such as the ability to produce powders in their pure form and with metastable phases. [8][9][10] Electrodeposition is a versatile technique offering various parameters such as current density, overpotential, electrolyte composition, temperature, substrate agitation, etc., which can be used to control the morphology, microstructure, and composition of the deposits. Among these parameters, the effect of potential ͑or current density͒ has been studied extensively and has substantial effect on the morphology of the deposits.…”

mentioning

confidence: 99%

The Formation of Morphologies and Microstructures in Electrodeposited Nanocrystalline Al–Mg Alloy Powders

Tatiparti

Ebrahimi

2010

J. Electrochem. Soc.

View full text Add to dashboard Cite

Al-Mg alloy powders were produced in the form of nanocrystalline dendrites using the galvanostatic electrodeposition technique. Two distinct morphologies namely, featherlike and globular, were observed under the employed deposition conditions. The featherlike morphology consisted of only the face-centered cubic ͑fcc͒-Al͑Mg͒ phase. However, the globular morphology was composed of the hexagonal close-packed ͑hcp͒-Mg͑Al͒ phase as well as the fcc-Al͑Mg͒ phase. Compositional and TEM studies revealed that both phases were supersaturated and exhibited a nanocrystalline microstructure. Short-time potentiostatic experiments revealed that the formation of these morphologies is dependent on the applied overpotential such that at high overpotentials, only the globular morphology develops, whereas at low overpotentials, only the featherlike morphology is created. These observations are discussed in terms of the deposition rate.Metallic powders can be produced using several techniques such as the solution-based aggregation, 1 the hydrothermal method, 2,3 and the sol-gel technique. 4 Electrodeposition has been gaining importance as a promising technique for fabricating nanocrystalline powders in dendritic forms. 5-7 The process has several advantages such as the ability to produce powders in their pure form and with metastable phases. [8][9][10] Electrodeposition is a versatile technique offering various parameters such as current density, overpotential, electrolyte composition, temperature, substrate agitation, etc., which can be used to control the morphology, microstructure, and composition of the deposits. Among these parameters, the effect of potential ͑or current density͒ has been studied extensively and has substantial effect on the morphology of the deposits. For example, near the equilibrium potential where the deposition rate is low, usually, growth takes place by epitaxial growth. 11 At higher deposition rates but below the diffusion-limiting current density, the formation of faceted crystals has been reported. 12,13 Under these conditions, charge-transfer mechanisms dominate and the crystal growth is mainly decided by the anisotropy in the interfacial energy and the growth rate. As the overpotential is increased, the deposition rate increases until a state is reached where the rate is limited by the diffusion of ions and the morphology tends to become sensitive to the composition gradient ahead of the deposition front and results in the formation of nodules and dendrites. For example, in Cu electrodeposition, at lower current densities, protruding tips have been reported to develop, which eventually grew into carrotlike structures. 14 At higher current densities or overpotentials, branching and dendritic growth was observed. 5,7,15-17 The geometry of the compositional gradient may also influence the morphology of the deposit. During the galvanostatic deposition of Au-Ag alloys, leaflike dendritic precursors with sharp tips and consisting of large well-defined crystallites were observed in the initial stages of the d...

show abstract

“…Low activation energy for formation of stacking faults could easily lead to formation of both phases in the samples. According to Tochitskii et al [27], considering firstly the deposition of single Cu element, the impurities in the form of SO À 4 and OH À ions, together with hydrogen, might be incorporated into the growing film as deposition proceeds. As a consequence, a retardation of growth (or passivation) of copper at the particular areas at the substrate surface may be observed.…”

Section: Film Growthmentioning

confidence: 99%

Growth and magnetic properties dependence of the Co–Cu/Cu films electrodeposited under high magnetic fields

Frańczak

Levesque

Żabiński

et al. 2015

Materials Chemistry and Physics

View full text Add to dashboard Cite

Fine structure and possible growth mechanisms of some electrodeposited CuCo granular films

Cited by 17 publications

References 27 publications

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

The Formation of Morphologies and Microstructures in Electrodeposited Nanocrystalline Al–Mg Alloy Powders

Growth and magnetic properties dependence of the Co–Cu/Cu films electrodeposited under high magnetic fields

Contact Info

Product

Resources

About