Co growth on Si(001) and Si(111) surfaces: Interfacial interaction and growth dynamics

Pan, Jisheng; Liu, R.S.; Zhang, Zheng; Poon, Siew Wai; Ong, W. J.; Tok, Eng Soon

doi:10.1016/j.susc.2006.01.029

Cited by 35 publications

(20 citation statements)

References 47 publications

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“…Although such studies have been carried out for several decades, on substrates as varied as Si, Ga, As, Pt, Pd and highly oriented pyrolytic graphite (HOPG) [4][5][6][7][8][9], most of these studies were confined to pure metal NPs. Recently, bimetallic NPs have become an interesting research field due to certain properties of nanoscale alloys, which may exist in a number of structures and phases that are different from those of the corresponding bulk metals [10,11].…”

Section: Introductionmentioning

confidence: 99%

Chemical and morphological characterizations of CoNi alloy nanoparticles formed by co-evaporation onto highly oriented pyrolytic graphite

Zhang

Sun

Bostetter

et al. 2010

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Chemical and morphological characterizations of CoNi alloy nanoparticles formed by co-evaporation onto highly oriented pyrolytic graphite

Zhang

Sun

Bostetter

et al. 2010

Journal of Colloid and Interface Science

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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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“…Therefore, in order to design magnetic materials for specific applications, it is necessary to understand the influence of the preparation process and the preparation materials on the resulting parameters such as grain size and magnetic structure, among others. Recently, different techniques have been employed to produce cobalt nanostructures onto different surfaces [1][2][3][4][5][6]. Although most of these cobalt cluster formation studies involve high vacuum methods, electrochemical deposition is becoming a powerful technique to produce cobalt nano-aggregates, since it can be used at room temperature under ambient conditions from water based electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

Rivera

Ríos-Reyes

Mendoza-Huízar

2008

Applied Surface Science

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Co growth on Si(001) and Si(111) surfaces: Interfacial interaction and growth dynamics

Cited by 35 publications

References 47 publications

Chemical and morphological characterizations of CoNi alloy nanoparticles formed by co-evaporation onto highly oriented pyrolytic graphite

Chemical and morphological characterizations of CoNi alloy nanoparticles formed by co-evaporation onto highly oriented pyrolytic graphite

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

Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

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