Self-assembled mesoporous silicon in the crossover between irregular and regular arrangement applicable for Ni filling

Granitzer, Petra; Rumpf, Klemens; Pölt, Peter; Reichmann, Angelika; Krenn, H.

doi:10.1016/j.physe.2006.12.031

Cited by 44 publications

(35 citation statements)

References 13 publications

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“…1). Fourier transform images of the top view give a four-fold symmetry shown previously [8]. By varying the current density j between 50 mA/cm 2 and 125 mA/cm 2 , the average pore-diameter d can be adjusted between 30 nm and 100 nm whereas the pore-distance decreases from 60 nm to 45 nm.…”

Section: Fabrication Of the Nanocompositementioning

confidence: 55%

Transition metals specifically electrodeposited into porous silicon

Rumpf

Granitzer

Poelt

et al. 2009

Phys. Status Solidi (c)

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Porous silicon (PS) is fabricated by anodization in aqueous hydrofluoric acid solution in the transition region between meso and macro pores. In the employed process the pore‐diameters are adjustable from 30 nm up to 100 nm using the same electrolyte as well as the same doping density of the wafer. Furthermore the self‐assembled pore‐arrangements show a quasi‐regular three‐dimensional nano‐architecture. These achieved PS‐membranes offering oriented pores with an aspect ratio around 1000 are filled with a transition metal in a galvanic deposition process. The use of different metals (Ni, Co, NiCo, Cu) together with the proper variation of the deposition parameters (e.g. current density and pulse duration) as well as the employment of different morphologies of the templates allow to tune the shape of the metal precipitations as well as their spatial distribution within the channels and therefore the possibility arises to influence the physical properties of the specimens. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Fabrication Of the Nanocompositementioning

confidence: 55%

Transition metals specifically electrodeposited into porous silicon

Rumpf

Granitzer

Poelt

et al. 2009

Phys. Status Solidi (c)

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“…As template material a porous silicon matrix is used, obtained by anodization of a highly n-doped silicon wafer in an aqueous hydrofluoric acid solution. The morphology of the matrix depends on the anodization parameters [6] whereas in the introduced work the pore-diameters are typically 60 nm leading to a porosity of about 40%. The pores are oriented, grown perpendicular to the surface and clearly separated from each other.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of a twofold magnetic behaviour of a nanoscopic metal/silicon hybrid system – a comparison between Ni/Si and Co/Si

Rumpf¹,

Granitzer²,

Poelt³

et al. 2009

Phys. Status Solidi (c)

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The investigated hybrid nanocomposite consists of a porous silicon template with electrochemically embedded Ni or Co nanostructures and offers magnetic characteristics which can be tailored by the electrochemical process parameters during fabrication. A twofold magnetic behaviour can be observed, a first one due to the spinmagnetism at magnetic fields below the saturation magnetization of the deposited metals and a second non‐saturating term at higher fields (> 1 T up to 7 T) above the saturation magnetization. In case of Ni deposited within the pores this non‐saturating term shows a paramagnetic characteristic and follows exactly the Curie‐Weiss law, whereas for Co/porous silicon samples the temperature dependent magnetization shows some deviations from the Curie Weiss law. In this high field region a difference in the temperature dependence between Ni and Co is observed whereas the non‐saturating term does not depend on the geometry of the embedded nanostructures in contrast to the ferromagnetic behaviour at lower magnetic fields. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The detailed description of the formation process is described in reference [9]. These PSmatrices are utilized for metal deposition within the channels.…”

Section: Methodsmentioning

confidence: 99%