ELASTIC PROPERTIES OF NANOMATERIALS

BASED ON POROUS SILICON

 

K. Rahmoun1,2*, Z. Fekih1, F.Z. Otmani1, C. Mathieu2, N.E. Chabane Sari1

1Unité de Recherche de Matériaux et Energies Renouvelables (U.R.M.E.R).

Université Abou Bakr Belkaïd, BP119 Tlemcen 13000, Algérie

2Université d’Artois, Faculté Jean Perrin, rue Jean Souvraz- S.P.18- 62307 Lens Cedex, France

* Corresponding author. E-mail: k_rahmoun@yahoo.fr

Received: 29 September 2006; revised version accepted: 28 February 2007

 

Abstract

     Porous silicon (PS) is obtained by electrochemical dissolution of Si wafer in aqueous, or ethanoic hydrofluoric-acid (HF) solutions. The interest on porous silicon concerns applications of this material as a “host matrix” using PS for nanocomposite materials. It could be used as multiphase material composed of silicon, oxide and pores could be filled with air, liquid or solid. Assuming that, in the large, such a material can be regarded as quasi-isotopic and quasi-homogenous. The problem is to predict the effective moduli in terms of the elastic moduli and volume fraction of the constituting phases. A simple way of composite material is proposed. The Bruggeman effective medium model has been applied to determine the PS composition from measurement of the refractive index. Mechanical properties of oxidized and non oxidized porous silicon are estimated for the different porosities. In this work a study has been made of the feasibility of applying multi-phase theory to the determination of the elastic properties of porous silicon

 

Keywords: Effective Medium; Young’s modulus; Oxidation; Porous Silicon; Refractive index.

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