Pd, Co and Co–Pd clusters on the ordered alumina film on NiAl(110): Contact angle, surface structure and composition

Napetschnig, E.; Schmid, Michael; Варга, П.

doi:10.1016/j.susc.2007.05.047

Cited by 51 publications

(76 citation statements)

References 50 publications

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“…57 Particularly, it has been shown for the very similar alumina film on NiAl͑110͒ that clusters of many metals exclusively nucleate on defects and at step edges. 27,[58][59][60] Moreover, the high chemical affinity between Al and O atoms should not allow Fe and Co atoms to form a strong bond to any oxygen atom of a defect-free oxygen-terminated alumina surface. Thus, the lowest energy for metal atoms deposited on alumina on Ni 3 Al͑111͒ would be in the corner holes, followed by defects.…”

Section: B Fe and Co Nucleation On The Unmodified Oxidementioning

confidence: 99%

Highly ordered Pd, Fe, and Co clusters on alumina onNi3Al(111)

et al. 2010

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Template-mediated growth of metals has attracted much interest due to the remarkable magnetic and catalytic properties of clusters in the nanometer range and provides the opportunity to grow clusters with narrow size distributions. We have grown well-ordered Fe and Co clusters on the ultrathin aluminum oxide on Ni 3 Al͑111͒, a template with a 4.1 nm lattice. The structure of the Ϸ0.5-nm-thick oxide film exhibits holes reaching down to the metal substrate at the corners of the ͑ ͱ 67ϫ ͱ 67͒R12.2°unit cell. Pd atoms trapped in these corner holes create metallic nucleation sites where Fe as well as Co clusters can nucleate and form a well-ordered hexagonal arrangement on the oxide nanomesh. We have studied these Fe and Co clusters and applied different methods such as scanning tunneling microscopy and surface x-ray diffraction to determine the morphology and crystallography of the clusters. For Fe, we found cluster growth in either bcc͓110͔ or bcc͓100͔ direction, depending on the deposition temperature and for Co we found close-packed planes on top of the clusters and random stacking of close-packed planes. Pd clusters grow with fcc͑111͒ orientation.

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Section: B Fe and Co Nucleation On The Unmodified Oxidementioning

confidence: 99%

Highly ordered Pd, Fe, and Co clusters on alumina onNi3Al(111)

et al. 2010

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“…Nowadays, different techniques have been employed to obtain cobalt clusters on different surfaces [2][3][4][5][6]. In particular, electrochemical deposition methods have become powerful techniques since they provide some advantages over traditional high vacuum methods.…”

Section: Introductionmentioning

confidence: 99%

Magnetic transition phase diagram of cobalt clusters electrodeposited on HOPG: Experimental and micromagnetic modelling study

Rivera

Ríos-Reyes

Mendoza-Huízar

2011

Journal of Magnetism and Magnetic Materials

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“…[16][17][18][19][20][21] Probably, high vacuum methods, 22 and thermal decomposition 23 have been the preferred techniques to prepare monodisperse magnetic cobalt clusters onto different substrates. But, recently, electrodeposition is being recognized as an useful technique to produce cobalt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13][14][15] Thus, it is not so strange that different methodologies are being developed to produce magnetic cobalt nanoclusters with controlled size and morphology. [16][17][18][19][20][21] Probably, high vacuum methods, 22 and thermal decomposition 23 have been the preferred techniques to prepare monodisperse magnetic cobalt clusters onto different substrates. But, recently, electrodeposition is being recognized as an useful technique to produce cobalt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Cobalt Nanoclusters From Ammonical Chloride Solutions Onto Hopg Electrodes. A Kinetical and Morphological Study

Mendoza-Huízar

Ríos-Reyes

Rivera

2017

J. Chil. Chem. Soc.

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A kinetical study about the Co electrodeposition onto Highly Oriented Pyrolytic Graphite electrodes from an aqueous solution containing 0.01 M CoCl 2 + 1 M NH 4 CI (pH = 7) was conducted at overpotential conditions through potentiostatic studies. The entire chronoamperograms were adequately predicted, considering the contribution to the total current of three different processes: a Langmuir-type adsorption process, a three-dimensional nucleation and growth and a proton reduction process. In all cases, the nucleation rate and the number of active nucleation sites are potential dependent. The Atomic Force Microscopy study revealed the presence of homogeneous cobalt clusters of less of 100 nm in height and 50 nm in diameter at different potential values.Keywords: cobalt; nanoclusters; HOPG; kinetics; AFM; MFM. INTRODUCTIONMaterials based on cobalt have attracted a considerable attention due to their magnetic properties, which can be used in the production of sensors, heterogeneous catalysts, intercalation compounds for energy storage, magnetooptic recording media, among others.1-8 Specifically, the magnetic properties of isolated cobalt particles change considerably as their sizes enter the nanometer range because they exhibit a large magnetic coercivity, which may be employed to fabricate high density magnetic memory devices.9-15 Thus, it is not so strange that different methodologies are being developed to produce magnetic cobalt nanoclusters with controlled size and morphology. [16][17][18][19][20][21] Probably, high vacuum methods, 22 and thermal decomposition 23 have been the preferred techniques to prepare monodisperse magnetic cobalt clusters onto different substrates. But, recently, electrodeposition is being recognized as an useful technique to produce cobalt nanoparticles. Also, it is important to highlight that electrodeposition is a simple electrochemical technique, which can be implemented at room temperature under ambient conditions. Moreover, these features make electrodeposition a non-expensive technique easily scalable to the industrial level. However, a good knowledge of the kinetic parameters involved during the electrodeposition process is required to achieve a precise control of the cobalt nanoclusters synthesis. In this sense, sulfate solutions have been the preferred systems to electrodeposit cobalt nanoclusters, [24][25][26][27][28][29][30] Although chloride solutions are widely employed for studying the cobalt electrochemistry, these plating baths have been scarcely used to electrodeposit cobalt nanoclusters. Probably, it is because chloride ions induces stress on the cobalt deposited, 31 and may interact strongly with Co adatoms yielding drastic changes on the deposit morphology.32 Nevertheless, chloride electrolytes allow to get a higher electrical conductivity in the electrolyte, lower overpotential for cobalt deposition, and higher cathodic current efficiency.31. These features of chloride plating baths might diminish the cost related to the synthesis of cobalt nanoclusters by ...

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Pd, Co and Co–Pd clusters on the ordered alumina film on NiAl(110): Contact angle, surface structure and composition

Cited by 51 publications

References 50 publications

Highly ordered Pd, Fe, and Co clusters on alumina onNi3Al(111)

Highly ordered Pd, Fe, and Co clusters on alumina onNi3Al(111)

Magnetic transition phase diagram of cobalt clusters electrodeposited on HOPG: Experimental and micromagnetic modelling study

Electrodeposition of Cobalt Nanoclusters From Ammonical Chloride Solutions Onto Hopg Electrodes. A Kinetical and Morphological Study

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