Vol. 27, Special Issue, May 2014, pp. 202-208

Abstract: Gold nanoparticles (GNP) with different sizes from commercially available colloids were deposited based on destabilization using HF acid onto porous silicon (PS) substrate formed by an electrochemical process. We studied the controlling factors and conditions of the size, morphology and distribution, further, the influence of gold colloid on porous silicon characteristics have been investigated. The variation of the surfaces' roughness and morphology after noble metal modification was exhibited by atomic force microscopy (AFM), while, Fourier Transform Infrared (FTIR) characterization techniques proved the oxidation of porous silicon substrate, hence, the passivation of the surface states. It was also observed that the reflectivity decreased due to the deposition process according to the size and the quantity of gold colloid solution. Moreover, the photoluminescence (PL) spectroscopy revealed that the intensity strongly depend on gold nanoparticles deposition. These are attributed to metal nanoparticles with narrow particle-size distribution uniformly coated on the surface, thus, the substrate efficiency is strictly related to their dispersion, which could yield to local surface plasmons (LSP).

Keywords: Porous silicon, Gold colloids, Morphology, Passivation, Surface Plasmons resonance.

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