Open Access Nano Commentary

Characterization of hybrid cobalt-porous silicon systems: protective effect of the Matrix in the metal oxidation

Álvaro Muñoz-Noval12, Darío Gallach1, Miguel Ángel García23, Vicente Ferro-Llanos4, Pilar Herrero5, Kazuhiro Fukami6, Yukio H Ogata6, Vicente Torres-Costa1, Raúl J Martín-Palma1*, Aurelio Ciment-Font1 and Miguel Manso-Silván1

Author Affiliations

1 Departamento de Física Aplicada, Universidad Autónoma de Madrid, Cantoblanco, Madrid 28049, Spain

2 Departamento de Electrocerámica, Instituto de Cerámica y Vidrio (ICV-CSIC), Cantoblanco, Madrid, 28049, Spain

3 IMDEA Nanociencia, Cantoblanco, Madrid, 28049, Spain

4 GTB, ETSIT Telecomunicaciones, Universidad Politécnica de Madrid, Madrid, 28040, Spain

5 Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Cantoblanco, Madrid, 28049, Spain

6 Institute of Advanced Energy, Kyoto University, Uji, Kyoto, 611-0011, Japan

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Nanoscale Research Letters 2012, 7:495  doi:10.1186/1556-276X-7-495

Published: 2 September 2012

Abstract

In the present work, the characterization of cobalt-porous silicon (Co-PSi) hybrid systems is performed by a combination of magnetic, spectroscopic, and structural techniques. The Co-PSi structures are composed by a columnar matrix of PSi with Co nanoparticles embedded inside, as determined by Transmission Electron Microscopy (TEM). The oxidation state, crystalline structure, and magnetic behavior are determined by X-Ray Absorption Spectroscopy (XAS) and Alternating Gradient Field Magnetometry (AGFM). Additionally, the Co concentration profile inside the matrix has been studied by Rutherford Backscattering Spectroscopy (RBS). It is concluded that the PSi matrix can be tailored to provide the Co nanoparticles with extra protection against oxidation.

Keywords:
Porous silicon; Hybrid materials; Metal electroinfiltration; Transmission electron microscopy